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CN-122014323-A - Island legacy coal pillar resource roadway system and collaborative fire prevention and extinguishment repeated mining planning method

CN122014323ACN 122014323 ACN122014323 ACN 122014323ACN-122014323-A

Abstract

The invention belongs to the technical field of planning and fire prevention and extinguishment control of a legacy coal resource repeated mining roadway system, and discloses an island legacy coal pillar resource roadway system and a fire prevention and extinguishment collaborative repeated mining planning method. The method comprises the steps of arranging a stoping roadway in a legacy coal pillar and reserving a small coal pillar, spraying inorganic solidified foam on the surface of surrounding rock in a roadway tunneling period to form a blocking layer, injecting a high polymer foam material into cracks, filling a flame-retardant nylon net and fireproof cotton into gaps of a support top beam, blocking, adopting a follow-up measure of combining spraying a blocking agent after the support with goaf nitrogen injection, constructing an intelligent system based on an ANFIS-TOPSIS algorithm to dynamically regulate and control spraying and nitrogen injection, and arranging a double isolation facility consisting of a wind shielding wall and a wind shielding curtain at a wind inlet and return corner. According to the invention, physical blocking is adopted in the tunneling period, and the full-period prevention and control of the spontaneous combustion risk of the coal seam are realized by adopting a goaf dynamic inerting and working face spraying inhibition and whole-process intelligent monitoring system during the stoping period.

Inventors

  • QU XIAO
  • YANG YINGSONG
  • Kou Aibo
  • CHEN SHAOJIE
  • YIN DAWEI
  • MA HONGFA
  • HAO JIAN
  • ZHANG JICHENG
  • SHENG SHOUQIAN
  • WANG RUI

Assignees

  • 山东科技大学

Dates

Publication Date
20260512
Application Date
20260313

Claims (10)

  1. 1. The island legacy coal pillar resource roadway system and fire prevention and extinguishing collaborative repeated mining planning method is characterized by comprising the following steps of: S1, evaluating the condition of a secondary coal seam based on mine geological data, arranging a stoping roadway in a legacy coal pillar (1), and reserving a small coal pillar with the width of 2-3 m; s2, spraying an inorganic curing foam material (3) on the surface of surrounding rock of the roadway during tunneling of the roadway to form an inorganic curing foam barrier layer, and plugging surrounding rock cracks; S3, during roadway stoping, adopting a mining-following prevention measure combining a stopping agent sprayed after a frame and nitrogen injection of the goaf (2), constructing a goaf (2) coal spontaneous combustion monitoring and active joint defense intelligent system based on monitoring data, and dynamically regulating and controlling the spraying and nitrogen injection measures; S4, setting a fireproof and sealed double isolation facility formed by a wind shielding wall and/or a wind shielding curtain at the corners of an air inlet side (11) and an air return side (12) of the working surface (10); s5, if coal is discharged after two sides of the working face (10), a step-type macromolecule solidified foam isolation wall is constructed behind the support (9) to form a goaf (2) lateral isolation belt.
  2. 2. The island legacy coal pillar resource roadway system and fire prevention and extinguishing collaborative repeated mining planning method according to claim 1, wherein in step S2, the plugging treatment of the surrounding rock cracks comprises: And filling gaps between the top beams of the top plate bracket (8) and the bracket (9) of the working face and the top plate (6) with flame-retardant nylon net (4) and fireproof cotton.
  3. 3. The island legacy coal pillar resource roadway system and fire prevention and extinguishing collaborative repeated mining planning method according to claim 2 is characterized in that the expansion ratio of the high polymer foaming material (5) is 15-30 times, the reaction time is 30-90 seconds, and the compressive strength of the cured plugging layer is not lower than 0.8MPa; The mesh size of the flame-retardant nylon net (4) is 10mm multiplied by 10mm to 20mm multiplied by 20mm, the oxygen index is more than or equal to 28%, the flame-retardant cotton is mining aluminum silicate fiber cotton, the filling thickness is 30 mm-100 mm, and the density is 80kg/m 3 ~120kg/m 3 .
  4. 4. The island legacy coal pillar resource roadway system and fire prevention and extinguishing collaborative repeated mining planning method according to claim 1, characterized in that in step S3, the goaf (2) coal spontaneous combustion monitoring and active joint defense intelligent system comprises: The monitoring subsystem is used for collecting and analyzing the gas components and the concentration in the goaf (2) in real time; The decision control subsystem is internally provided with an ANFIS-TOPSIS hybrid algorithm, calculates the spontaneous combustion risk degree according to the data of the monitoring subsystem and optimizes the optimal fire prevention and extinguishing strategy from a preset candidate strategy set; And the execution subsystem comprises a post-frame spraying device (14) and a nitrogen injection pipeline (26) and is used for responding to the instruction of the decision control subsystem and executing the stopping agent spraying or nitrogen injection operation of the goaf (2).
  5. 5. The island legacy coal pillar resource roadway system and fire prevention and extinguishing collaborative repeated mining planning method according to claim 4, wherein the monitoring subsystem comprises: A signal collection beam tube (13) for collecting a working face gas sample in real time; a bundle tube (23) for transporting the gas to the analysis device; a multi-element gas sensor (22) for analyzing the O 2 、CO、C 2 H 4 、CH 4 gas component; And a pressure gauge (15) for monitoring the change in gas pressure.
  6. 6. The island legacy coal pillar resource roadway system and fire prevention and extinguishing collaborative repeated mining planning method according to claim 4, wherein the decision control subsystem comprises: the data processor (21) is used for running an ANFIS-TOPSIS algorithm and outputting an optimal fire prevention and extinguishing decision; the PLC control system (20) is used for executing the instructions of the data processor (21) and controlling the execution subsystem; The execution subsystem includes: the spraying side comprises a first valve (17) for controlling the flow of the stopping agent, a pressurizing device (18) for providing spraying pressure, a stopping agent container (19) for storing gangue powder-water mixed stopping agent, and a conveying pipeline (16) for connecting all spraying components and conveying the stopping agent; The nitrogen injection side comprises a spraying device (14) behind the frame for executing stopping agent spraying, a second valve (24) for controlling nitrogen flow, a nitrogen storage chamber (25) for storing high-purity nitrogen, and a nitrogen injection pipeline (26) for conveying the nitrogen to the goaf (2).
  7. 7. The island legacy coal pillar resource roadway system and fire prevention collaborative repeated mining planning method of claim 4, wherein the instructions for responding to the decision control subsystem comprise: when the carbon monoxide concentration is monitored to be continuously more than or equal to 50ppm, starting the post-rack spraying device (14); when the oxygen concentration is more than or equal to 18% or the ethylene gas is monitored, nitrogen injection in the goaf (2) is started, and the oxygen concentration is reduced to below 12% to be used as a control target.
  8. 8. The island legacy coal pillar resource roadway system and fire prevention and extinguishing collaborative repeated mining planning method according to claim 7, characterized in that the decision control subsystem executes an ANFIS-TOPSIS hybrid algorithm to dynamically evaluate spontaneous combustion risk of the goaf (2) and accurately control prevention and control measures, and comprises the following steps: a. collecting and preprocessing multielement data, namely collecting gas parameters of a goaf (2), constructing monitoring parameter vectors and carrying out normalization processing; (1) The data acquisition period is 5s, and the expression is: ; In the formula, The data acquisition period is; (2) The physical parameters of the spontaneous combustion risk of the goaf coal at the moment are as follows: ; Wherein, the Calculated by pressure gradient: ; In the formula, In order for the permeability coefficient to be a good measure, In order to observe the distance of the object, Is the cross-sectional area of the roadway, Is the air leakage quantity; (3) Data normalization processing for 7-D input Normalized to : ; In the formula, Is that At the position of Time of day (time) The normalized value of the individual parameter is then, Is that At the position of Time of day (time) The raw monitored values of the individual parameters are, Is that In the historical data The maximum value of the individual parameters is set, Is that In the historical data The minimum value of the individual parameters is set, The value range is from 1 to 7 for parameter index; Wherein, the Concentration detection, deriving a discrete indicator for triggering use: ; In the formula, Is that The ethylene concentration overrun at the moment indicates a variable, A detection limit for the equipment is determined by the equipment; the ANFIS output was obtained as: ; In the formula, For the normalized input vector to be a function of the input vector, For the temperature after the normalization, For the normalized pressure difference to be the same, For the normalized air leakage intensity, Converting the row vector into a column vector for the transpose; Modeling the ANFIS risk degree, namely inputting the normalized parameter vector into the ANFIS model, and outputting the risk degree representing the spontaneous combustion risk level ; (1) Input-output definition: Input: and outputting, namely, self-ignition risk degree: ; Defining a risk level : ; In the formula, Is the spontaneous combustion risk degree at the time t, Is the risk of spontaneous combustion; (2) Setting fuzzy membership; for each input Setting 3 fuzzy sets, namely low, medium and high respectively Using Gaussian membership functions: ; In the formula, For inputting variables Belonging to the first Fuzzy set Is used for the degree of membership of the group (a), To correspond to the central value of the gaussian function, To correspond to the width of the gaussian function, Indexing for fuzzy set; (3) A rule layer and a rear position; First, the Bar rule: ; In the formula, Is the first The rule of the bar ambiguity, , As a result of the normalized input variable, , Is the first Fuzzy sets of corresponding input variables in the bar rule, # is a logical AND operation, indicating that all conditions must be met simultaneously, Is the first The output function of the bar rule is that, Is the first In the rule of bar The linear coefficients of the individual input variables are, Is the first Constant terms of the bar rule; Rule trigger intensity: ; In the formula, Is the first Triggering strength of the bar fuzzy rule; Normalization: ; In the formula, Is the first The normalized trigger intensity of the bar rule is, Is the first Triggering strength of the bar rule; ANFIS output: ; In the formula, Is that The risk of spontaneous combustion at the moment of time, Is the first The rule-strip back-piece outputs the function value; (4) Training a target; if there is a historical spontaneous ignition event A, the historical ignition early warning/treatment record is used for giving Minimizing mean square error: ; In the formula, In the form of a mean square error, In order to train the total number of samples, Is the first The true risk tag of the individual samples, Is the first Model prediction risk degrees of the samples; If no history spontaneous combustion ignition event B exists, constructing a pseudo tag by using a threshold value, wherein the pseudo tag comprises ethylene one-ticket overrule and an O 2 /CO threshold value; ; In the formula, Is that The false risk tag of the moment in time, Is that The weight coefficient of the overrun is calculated, Is that The CO overrun state variable at the moment in time, Is the weight coefficient of oxygen overrun, For a weight coefficient for which ethylene is overrun, Is that An ethylene concentration overrun indicating variable at a moment; Taking out If ethylene is detected, starting nitrogen injection operation; TOPSIS strategy preference at risk Dynamically adjusting the weight of TOPSIS evaluation indexes, and selecting an optimal fire prevention and extinguishing strategy from the candidate strategy set; (1) Candidate policy set Only early warning and observation, no action and/or extremely low intensity; low intensity spray, retarder spray = 20L/min, duration = 30min; High intensity spray, retarder spray = 50L/min, duration = 60min; low-intensity nitrogen injection, nitrogen injection flow = 200m3/h, duration = 60min; High-strength nitrogen injection to achieve the aim of oxygen concentration less than 12%, nitrogen injection flow = 500m3/h, duration = 120min; Low-intensity spraying and nitrogen injection are combined; High-strength spraying and nitrogen injection are combined; for each policy, associating adjustable parameters: ; In the formula, Is the first The parameter vectors of the individual candidate strategies, In order to achieve a spray intensity, the spray intensity, In order to inject the nitrogen flow rate, For duration of time; (2) Cutting by hard constraint; If it is Then the candidate set must contain a spray class ; If it is Or (b) Then the candidate set must contain nitrogen injection ; For all candidate strategies containing nitrogen injection, the target constraint must be satisfied, then the prediction or setting satisfies: ; In the formula, As a predicted value of the concentration of oxygen, For the current moment of time, The predicted execution time length of the strategy; Otherwise, the strategy is judged to be infeasible and rejected; (3) TOPSIS index system; for each candidate strategy, constructing an index vector , wherein, In order to reduce the oxygen to reach the standard, In order to be able to suppress CO, In order to take effect for the time of onset, In order to be a cost of material/energy consumption, In order to be able to cope with the production disturbances, For safety controllability, form decision matrix The rows represent the policies and the column represents the indicators; (4) A quantization index; influence of nitrogen injection on oxygen: Is provided with an effective influencing volume Mixing efficiency : ; Defining oxygen reduction standard reaching indexes: ; In the formula, Is a strategy Is an oxygen reduction standard reaching capability index; The suppression of CO by spraying is shown as an exponential decay empirical model: ; ; In the formula, As a predicted value of the concentration of carbon monoxide, For spraying stopping agents The coefficient of the efficiency of the device is suppressed, Is a strategy CO inhibition capability index of (2); Time of onset/cost/perturbation/safety: ; ; ; ; In the formula, Is a strategy Is used for controlling the action time index of the (a), Is a strategy Is used for the time of the expected onset of action, Is a strategy Is a material/energy consumption cost indicator of (c), Is a cost factor per unit of retarder spray, Is a cost factor of the unit nitrogen injection amount, Is a strategy Is characterized by that the production disturbance index of (a) is set, In order to spray intensity versus the disturbance factor of the production, To be the disturbance factor of nitrogen injection flow to production, Is a strategy Is used for controlling the safety and controllability indexes of the system, A safety risk penalty factor for high concentrations of methane, To predict the safety risk penalty factor for too low an oxygen concentration, Is a threshold value for a high concentration of methane, Is a lower limit of the operation safety oxygen concentration; (5) TOPSIS standard calculation; forward conversion of indexes: ; In the formula, Is an index value after forward conversion, Is the first in the original decision matrix Policy No. The original value of the individual index is used, As an index of the index, Is the first of all strategies The maximum value of the individual indicators is set, Is the first of all strategies Minimum value of the individual indicators; Normalization: ; In the formula, Is the index value after normalization; Weighting: ; In the formula, As a result of the weighted decision matrix elements, Is the first The weight coefficient of each index; positive ideal solution/negative ideal solution: ; In the formula, In order to be properly understood, the device has the advantages of, Is a negative ideal solution to the problem that, To at the first The maximum value among all strategies, To at the first Minimum value in all strategies on each index; Distance and degree of adhesion: ; ; In the formula, Is the first The individual strategies are from the euclidean distance that is being understood, Is the first The euclidean distance of the individual strategies from the negative ideal solution, To get the best understanding at the first The value on the individual index is set to be, Is negative ideal solution in the first The value on the individual index is set to be, Is the first Relative closeness of individual policies; Taking out The largest strategy is the optimal strategy: ; In the formula, Is that The optimal fire prevention and extinguishing strategy selected by the time system, Is a policy index; (6) Anfis→topsis dynamic regulation; using ANFIS risk Dynamically adjusting TOPSIS weights, supplementing the rest weights according to normalization, and adding the weights to the total weight Near the dangerous area, the system selects a combination and high-strength strategy; ; ; In the formula, For the oxygen reduction standard reaching capability index weight which dynamically changes along with the risk degree R, For the CO inhibition capability index weight that dynamically varies with risk R, For a material/energy consumption cost indicator weight that dynamically varies with risk R, For the production disturbance index weight dynamically changing along with the risk degree R, Outputting the spontaneous combustion risk degree for the ANFIS model; d. Mapping and executing the instruction, namely mapping the optimal strategy into a specific control instruction and sending the specific control instruction to an execution subsystem; (1) Control output vector to PLC ; In the formula, Is that The control command vector sent to the PLC at the moment, Is that The time command requires the intensity of the inhibitor spray, Is that The time command requires a nitrogen injection flow rate, Is that The time of day instruction requires a measure execution duration, The opening degree of the first valve (17), the booster (18), the spray after rack (14) and the second valve (24) are respectively corresponding, and the opening degree range is 0-100%; (2) Mapping an optimal strategy to an action; If it is The low spray, i.e. the opening of the first valve (17) is set to 30%, the pressurizing device (18) is activated and the second valve (24) is closed for 30 minutes: ; In the formula, The optimal strategy to be selected for the system, For a low intensity spray strategy, For the duration of execution in the instruction, Is a strategy A preset duration; If it is The nitrogen is injected low, namely the first valve (17) is closed, the pressurizing equipment (18) is stopped, the opening degree of the second valve (24) is set to 40%, and the duration is 60 minutes: ; In the formula, In order to make the low-strength nitrogen injection strategy, For the nitrogen injection flow rate in the instruction, Is a strategy The preset nitrogen injection flow rate is adopted, Is a strategy A preset duration; If it is The high-strength combination, namely 80% of the opening of the first valve (17), 90% of the opening of the second valve (24) and 120 minutes of the opening of the pressurizing device (18) are started: ; In the formula, Is a strategy The preset spraying intensity is adopted to ensure that the water level is high, Is a strategy The preset nitrogen injection flow rate is adopted, Is a strategy A preset duration; other cases: Valve with valve body Closing; high spraying, i.e. the opening of the first valve (17) is set to 80%, the pressurizing device (18) is started, the second valve (24) is closed for 60 minutes; High nitrogen injection, namely closing a first valve (17), stopping the pressurizing equipment (18), setting the opening of a second valve (24) to 90%, and keeping the duration of 120 minutes; The combination of low intensity, namely 30% of the opening of the first valve (17), the starting of the pressurizing device (18) and 40% of the opening of the second valve (24), lasts for 60 minutes; (3) Hard triggering forced setting coverage; Regardless of the TOPSIS output, as long as the trigger condition is satisfied, the enforcement: ; ; and writing the nitrogen injection target into a closed-loop constraint, namely fully opening the first valve (17), starting the pressurizing equipment (18), and lasting for 60 minutes: ; and the dynamic regulation and control of fire prevention and extinguishment are completed.
  9. 9. The island legacy coal pillar resource roadway system and fire prevention and extinguishing collaborative re-mining planning method is characterized in that in the step S4, a wind shielding wall is formed by building shale bricks and cement mortar, thick expansion type fireproof paint is smeared on one side of a wall body facing a goaf (2) to realize dual fireproof and sealing performances, a water draining hole is reserved at the bottom of the wall body and is used for draining water accumulated in the goaf (2), a monitoring hole is reserved in the middle of the wall body and is used for inserting a gas detection device, the height of the monitoring hole is consistent with that of a roadway, the width of the monitoring hole is 400mm wider than that of a gate, the thickness of the monitoring hole is more than or equal to 500mm, the wind shielding curtain body is made of 0.8mm thick flame retardant canvas, a matched galvanized steel wire rope is used as a hanging bearing piece, a seam width button hole is used for fixing the circumference of the canvas and an observation window is arranged in the middle of the monitoring hole and is used for checking the condition of the goaf (2).
  10. 10. The island legacy coal pillar resource roadway system and fire prevention and extinguishing collaborative repeated mining planning method according to claim 1 is characterized in that in step S5, step by step bypass grouting is adopted, and high polymer solidified foam is injected to the goaf (2) side by pressure through preset drilling holes along with the advance of a working surface for a certain distance, so as to form a partition wall; After the grouting of the point is completed, the grouting pipe is withdrawn, the working face continues to be extracted and advanced, when the working face is advanced to the next preset distance, the next partition wall is constructed, and the circulation is performed in this way, so that the isolation belt is finally formed.

Description

Island legacy coal pillar resource roadway system and collaborative fire prevention and extinguishment repeated mining planning method Technical Field The invention belongs to the technical field of planning and fire prevention and extinguishment control of a legacy coal resource repeated mining roadway system, and particularly relates to a collaborative repeated mining planning method for an island legacy coal pillar resource roadway system and fire prevention and extinguishment. Background Natural ignition of coal beds is one of major disasters of coal mines, and particularly under the conditions of high gas and island working surfaces, residual coal is left in adjacent goaf, so that an spontaneous combustion hotbed with extremely strong concealment is formed, the original closed state is inevitably destroyed by mining disturbance in the mining process, an air leakage channel is formed, the large-scale reburning of the goaf coal is extremely easy to occur due to oxygen inrush, a large amount of toxic and harmful gas is generated, and personnel and production safety are seriously threatened. In addition, as personnel, electromechanical equipment, a roadway through which wind flows, the arrangement position of the roadway and fire prevention and extinguishing measures in the roadway directly determine the difficulty of fire prevention and extinguishing work, and the method is also a key for determining the success and failure of island working face fire prevention and extinguishing. The traditional mining fire prevention and extinguishing technology has the problems of uneven coverage, poor inerting effect, equipment corrosion and the like caused by grouting, nitrogen injection and stopping agent spraying, and is difficult to cope with complex geological conditions. Therefore, in the island coal pillar resource re-mining, the mine fire prevention and extinguishing work is a core link for building a safe underground defense line and protecting the life health of miners, and the systematic fire prevention and extinguishing scheme design is developed in a targeted manner, so that the natural fire risk is fundamentally restrained, and the safe stope of a working face is ensured. Through the above analysis, the problems and defects existing in the prior art are as follows: (1) When the island coal pillar is subjected to repeated mining, the planning and design of a roadway system often only consider the convenience of tunneling and stoping, so that roadway arrangement and fire prevention measures are mutually split, and systematic source prevention and control are lacked. (2) The traditional grouting, nitrogen injection or stopping agent spraying technology adopts a mode of fixed parameter and continuous operation, has single and extensive fire prevention and extinguishing measures, lacks linkage, and is difficult to realize the accurate inerting of the oxidation zone of the goaf. (3) The existing monitoring system only has the functions of data acquisition and threshold alarming, cannot deeply fuse and mine massive monitoring data, lacks an adaptive intelligent decision system and is suitable for response delay of sudden fire. (4) The conventional wind shielding wall or curtain of the air inlet and return corner generally has a simple wind shielding function, is simple in structure, and has weak control means of the corner and lateral air leakage, so that the function of a closed facility is single. (5) In order to improve the recovery rate of resources, coal is required to be put on two sides of a part of working surfaces, but the prior art has insufficient knowledge of lateral air leakage risks possibly caused by the technology, and lacks a specific 'goaf lateral isolation belt' construction method, so that the goaf after coal is put is directly communicated with an adjacent working space, and the spontaneous combustion risk is greatly increased. Disclosure of Invention In order to overcome the problems in the related art, the disclosed embodiment of the invention provides an island legacy coal pillar resource roadway system and a fire prevention and extinguishing collaborative repeated mining planning method, which comprises the following steps: the invention is realized in such a way that an island legacy coal pillar resource roadway system and a fire prevention and extinguishment collaborative repeated mining planning method are realized, and the method comprises the following steps: s1, evaluating the condition of a secondary coal seam based on mine geological data, arranging a stoping roadway in a legacy coal pillar, and reserving a small coal pillar with the width of 2-3 m; S2, spraying an inorganic curing foam material on the surface of surrounding rock of the roadway during tunneling of the roadway to form an inorganic curing foam barrier layer, and plugging surrounding rock cracks; s3, during roadway stoping, adopting a mining follow-up measure combining a spraying inhibitor after a frame and goaf ni