CN-121980537-A - Strip mine burning change cliffside slope protection treatment method based on structural response analysis

CN121980537ACN 121980537 ACN121980537 ACN 121980537ACN-121980537-A

Abstract

The invention relates to the technical field of geotechnical engineering, in particular to a strip mine burning change cliffside slope protection and treatment method, device and equipment based on structural response analysis and a computer storage medium. The method comprises the steps of establishing a thermodynamic coupling baseline, collecting continuous time sequence data of temperature, displacement and stress of a slope area, analyzing multi-source heat contribution of a heat source in a daily period, and modeling the influence of the multi-source heat on the response of the slope structure as an initial thermodynamic response baseline of the slope structure. The invention constructs a thermodynamic coupling base line and extracts micro-crack characteristics, realizes the separation of thermotropic response and mechanochromatic response, combines space consistency analysis and dynamic threshold construction, accurately identifies the slip risk, and forms a closed-loop treatment mechanism by linking early warning scheduling with on-site intervention and feeding back a correction model, thereby remarkably improving the accuracy and the intelligent level of slope safety monitoring in a high-temperature environment.

Inventors

REN PENG
HE ZHAO
LI HONGJIE
LI WEI
WANG DONGYU
PU SHAOCHANG
ZHAO RUHUI
Nian Xibo
Sun Guozhao
GUO XIAFEI

Assignees

煤炭科学技术研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20251230

Claims (10)

1. The strip mine burning cliffside slope protection treatment method based on structural response analysis is characterized by comprising the following steps of: establishing a thermodynamic coupling baseline, collecting continuous time sequence data of temperature, displacement and stress of a slope region, analyzing multi-source heat contribution of a heat source in a daily period, and modeling the influence of the multi-source heat on the response of the slope structure as an initial thermodynamic response baseline of the slope structure; based on a thermal response baseline, separating a thermal action domain from a force action domain, and extracting three characteristic parameters of contact stiffness increment, porosity reduction amplitude and acoustic emission silence window as identification indexes for distinguishing thermal action from force action response by analyzing closure behaviors of side slope rock micro-cracks under high temperature conditions; According to the identification index, carrying out space synchronization consistency analysis on response data of a plurality of monitoring points, screening out transient surge signals only appearing at a single monitoring point, identifying response consistency areas simultaneously presented by the plurality of monitoring points, and determining a continuous force-induced response area; Based on dynamic response data of the persistence force-induced response area, constructing a thermoelastic regression model, and reconstructing a real slip threshold curve by combining a time shift window identification method to generate a dynamic identification threshold for distinguishing the real slip response from a thermally-induced disturbance signal; Implementing hierarchical early warning scheduling according to the dynamic discrimination threshold, and executing temperature control spraying, sunshade shielding measures and an anchoring structure stress slow-release device in a linkage way under the condition of high Wen Raodong meeting early warning conditions so as to intervene in the thermally induced disturbance response and check the adaptability of the dynamic threshold; And feeding back the monitoring residual error and the protection intervention gain data acquired in the early warning scheduling process to a thermodynamic response baseline, synchronously updating parameters of the thermoelastic regression model, realizing self-adaptive correction and dynamic threshold updating of the baseline, and constructing a closed-loop treatment mechanism for monitoring, judging, scheduling and correcting.
2. The method for controlling slope protection of a strip mine burn-out cliffside based on structural response analysis according to claim 1, wherein the establishing a thermodynamic coupling baseline, collecting continuous time series data of temperature, displacement and stress of a slope region, analyzing multi-source heat contribution of a heat source in a daily period, and modeling the influence of the multi-source heat on the structural response of the slope as an initial thermodynamic response baseline of the slope structure comprises: Arranging a plurality of observation points in a side slope monitoring area, arranging a temperature acquisition device, a displacement acquisition device and a stress acquisition device at each observation point, and respectively acquiring temperature data, displacement data and stress data near the surface layer, the shallow layer and the structural surface of the rock mass, wherein the data acquisition interval is once every 30 minutes, and the observation period is not less than 72 continuous hours; Aligning the acquired temperature, displacement and stress data in a time stamp mode, dividing the data blocks according to a period of 24 hours, eliminating abnormal data generated by blasting, rainfall and artificial interference, and then carrying out trend comparison analysis on the temperature, the stress and the displacement to identify a typical response rule of a slope structure in the heating and cooling processes; Establishing a response mapping relation between temperature change, stress increment and displacement increment, identifying corresponding characteristics between a thermal disturbance input and a structural response output, and selecting monitoring point data with stable response rules to form a thermal response baseline; And carrying out continuous verification experiments based on the constructed thermal response base line, and taking the thermal response base line as a thermal disturbance response reference surface of the slope structure under the condition of no slip after confirming that the stress error is +/-0.05 MPa and the displacement error is +/-0.3 mm.
3. The strip mine burning change cliffside slope protection and management method based on structural response analysis according to claim 1, wherein the implementation of separation of a thermally induced acting domain and a force induced acting domain based on a thermal response baseline, and extraction of three characteristic parameters of contact stiffness increment, porosity reduction amplitude and acoustic emission silence window as identification indexes for distinguishing thermally induced and force induced responses by analyzing closure behaviors of micro-cracks of a slope rock mass under high temperature conditions comprise: Selecting a plurality of monitoring points with stable response rules in the thermodynamic coupling baseline establishment process, extracting continuous displacement data of a daily temperature rise stage, carrying out manual trend analysis on a displacement curve, and identifying the structure closing behavior of a crack from opening to shrinkage; In the identified fracture closing time period, respectively calculating stress change and displacement change in the time period before and after fracture closing to obtain contact stiffness and calculate a stiffness increment so as to reflect the structural stiffness enhancement degree; Acquiring sound wave propagation speed or resistivity change data by utilizing ultrasonic monitoring devices or rock mass resistivity devices distributed at two ends of the fracture, converting to obtain porosity change, and extracting porosity reduction amplitude as a criterion of structure compaction; analyzing the change of the number of acoustic emission events in the fracture closure period, and if a silence window with acoustic emission events lower than 3 times appears for more than 30 continuous minutes, combining the increment of rigidity and the descending amplitude of porosity to serve as identification indexes of thermally induced response.
4. The strip mine burn-out cliffside slope protection and management method based on structural response analysis according to claim 1, wherein the performing spatial synchronization consistency analysis on response data of a plurality of monitoring points according to the identification index, screening out transient surge signals only appearing at a single monitoring point, identifying a response consistency area simultaneously presented by the plurality of monitoring points, and determining a persistence force-induced response area comprises: Constructing a 12-hour response analysis window by taking the contact stiffness increment, the porosity change value and the sound emission event number of each monitoring point as the center at the highest temperature moment of each day, dividing time periods by taking 30 minutes as intervals, and ensuring that all data time stamps are aligned strictly; Comparing the change directions and the change amplitudes of three parameters of all monitoring points in each time period, judging as a space consistency response period when more than two monitoring points at least three different positions have consistent parameter directions and obvious change, and eliminating isolated abnormal data; Classifying two or more continuous consistent response sections into continuous response sections, further analyzing whether three indexes have continuous enhancement trend, and judging whether the three indexes are potential force-induced instability precursors or not; And comparing the response amplitude of the sustainable response section with a thermodynamic coupling baseline, and determining the sustainable force-induced response section if the stress change exceeds 0.15 megapascal, the displacement exceeds 0.8 millimeter and the acoustic emission frequency is more than twice of the baseline.
5. The strip mine burn-out cliffside slope protection and treatment method based on structural response analysis according to claim 1, wherein the dynamic response data based on the sustainable force-induced response area is used for constructing a thermoelastic regression model, and the real slip threshold curve is reconstructed by combining a time shift window identification method, and the dynamic discrimination threshold for distinguishing the real slip response from the thermally induced disturbance signal is generated by the following steps: Extracting temperature, stress and displacement data of each monitoring point in the sustainable force-induced response area in a period of no less than 72 hours continuously, and establishing a corresponding relation between temperature change and structural response in a stage of Wen Raodong; forming a thermoelastic regression model in a daily high-temperature disturbance stage based on the established temperature-response correspondence, and identifying a thermal response stable region, a critical region and a non-thermally induced region; matching a thermo-elastic model with real-time response by adopting a time rolling window method with 24 hours a day as a period, and marking the response continuously exceeding the critical growth rate as a non-thermal abnormal response section; And constructing a dynamic slippage judgment threshold curve according to the abnormal response section, and taking a non-thermally induced demarcation point of temperature, stress and displacement as a judgment reference to realize dynamic identification and early warning of the real slippage trend of the structure.
6. The method for controlling the slope protection of the strip mine burn-out cliffside based on the structural response analysis according to claim 1, wherein the step of implementing the hierarchical early warning schedule according to the dynamic discrimination threshold value, and executing the temperature control spraying, the sunshade shielding measure and the anchoring structural stress slow-release device in a linkage manner under the condition of high Wen Raodong meeting the early warning condition, so as to intervene the thermal disturbance response and check the adaptability of the dynamic threshold value comprises the following steps: Setting three-level early warning standards based on the degree and duration that the structural stress value and displacement increment exceed the corresponding temperature dynamic threshold value, and generating a space classification chart according to the response condition of each monitoring point; When the first-level response standard is reached, intermittent water mist spraying operation with the abnormal monitoring point as the center radius not smaller than 10 meters is executed, the spraying temperature is controlled at 20 ℃, and the spraying interval is 40 minutes; When the second-level response standard is reached, except for continuing spraying, a reflective sunshade material with the width of not less than 5 meters is deployed on the top of the slope to shield a high-temperature area, and the shielding time is not less than 4 hours; When the three-level response standard is reached, the tension of the anchor cable positioned in the high-response area is released in stages, the release amplitude is controlled to be 10-15% of the original tension, the unloading effect is evaluated according to the response data, and the adaptability of the dynamic threshold is verified.
7. The strip mine burn-out cliffside slope protection and treatment method based on structural response analysis according to claim 1, wherein the feedback of the monitoring residual error and protection intervention gain data acquired in the early warning scheduling process to the thermal response baseline and the synchronous updating of the parameters of the thermo-elastic regression model realize the self-adaptive correction of the baseline and the updating of the dynamic threshold, and the construction of the closed loop treatment mechanism for monitoring, judging, scheduling and correction comprises: after the hierarchical early warning scheduling is completed, collecting stress change values and displacement change values of all monitoring points before and after treatment, and calculating residual errors between a model predicted value and an actual response value; Collecting control quantity parameters and structure response change values in the implementation process of temperature control spraying, sunshade shielding and anchoring structure unloading measures, and calculating intervention gains of various control measures; according to the monitoring residual error and the intervention gain, synchronously correcting parameters of temperature-stress, temperature-displacement response slope, thermoelastic critical point and response lag time in the thermoelastic regression model; And taking the corrected model parameters as a calculation basis of next period response judgment and early warning scheduling, and updating the dynamic judgment threshold value of each monitoring point according to the calculation basis, so as to realize the self-adaptive updating of the thermodynamic response base line.
8. Strip mine burning cliffside slope protection treatment device based on structural response analysis, which is characterized by comprising: the thermodynamic response baseline determination module is used for establishing a thermodynamic coupling baseline, collecting continuous time sequence data of temperature, displacement and stress of the slope area, analyzing multi-source heat contribution of a heat source in a daily period, and modeling the influence of the multi-source heat on the response of the slope structure as an initial thermodynamic response baseline of the slope structure; The identification index determining module is used for separating the thermal action domain from the force action domain based on a thermal response baseline, and extracting three characteristic parameters of contact stiffness increment, porosity reduction amplitude and acoustic emission silence window as identification indexes for distinguishing thermal action and force action response by analyzing closure behaviors of the slope rock micro-cracks under high temperature conditions; The force-induced response area determining module is used for carrying out space synchronization consistency analysis on response data of a plurality of monitoring points according to the identification indexes, screening out transient sudden increase signals only appearing at a single monitoring point, identifying response consistency areas simultaneously presented by the plurality of monitoring points and determining a continuous force-induced response area; the dynamic discrimination threshold determining module is used for constructing a thermoelastic regression model based on dynamic response data of the persistence force-induced response area, reconstructing a real slip threshold curve by combining a time shift window discrimination method, and generating a dynamic discrimination threshold for distinguishing the real slip response from a thermally induced disturbance signal; The early warning scheduling module is used for implementing hierarchical early warning scheduling according to the dynamic discrimination threshold, and executing temperature control spraying, sunshade shielding measures and an anchoring structure stress slow-release device in a linkage way under the condition of high Wen Raodong meeting the early warning condition so as to intervene in the thermally induced disturbance response and check the adaptability of the dynamic threshold; The closed loop feedback updating module is used for feeding back the monitoring residual error and the protection intervention gain data acquired in the early warning scheduling process to the thermal response base line, synchronously updating parameters of the thermoelastic regression model, realizing self-adaptive correction and dynamic threshold updating of the base line, and constructing a closed loop treatment mechanism for monitoring, judging, scheduling and correcting.
9. Strip mine burning cliffside slope protection treatment equipment based on structural response analysis, which is characterized by comprising: A memory for storing a computer program; a processor for implementing the steps of a strip mine burn-up cliffside slope protection management method based on structural response analysis as claimed in any one of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when executed by a processor, the computer program implements the steps of a strip mine burn-up cliffside slope protection management method based on structural response analysis as defined in any one of claims 1 to 7.

Description

Strip mine burning change cliffside slope protection treatment method based on structural response analysis Technical Field The invention relates to the technical field of geotechnical engineering, in particular to a strip mine burning change cliffside slope protection and treatment method, device and equipment based on structural response analysis and a computer storage medium. Background The term "strip mine burning change cliffside slope protection treatment based on structural response analysis" refers to a technical path for dynamically identifying potential instability characteristics of a slope by taking structural response parameters (such as displacement, stress, crack evolution, vibration characteristics and the like) as discrimination basis for a burning change cliffside slope region formed by rock mass under the action of high-temperature thermal alteration in the mining process of the strip mine and implementing accurate protection and treatment measures based on response results. According to the method, by arranging sensors or collecting monitoring data, dynamic structure behaviors of the slope under the influence of environmental changes, blasting disturbance, stress redistribution and the like are evaluated in real time, abnormal response characteristics of the slope before instability are extracted, risk grades are divided, and targeted reinforcement measures such as anchoring, spraying protection, drainage, load shedding and the like are formulated. Compared with the traditional static evaluation means, the method has the advantages of strong real-time performance, high discrimination precision and control strategy according to local conditions, is particularly suitable for slope scenes with complicated structures of burnt rock areas, weakened mechanical properties and hidden catastrophe triggering mechanisms, and effectively improves the safety and sustainability of strip mine slope engineering. The prior art has the following defects: In the prior art, the strip mine slope stability monitoring mainly relies on a stress strain sensor, an optical fiber inclinometer or a rock mass acoustic emission device to collect structural response parameters in real time, and takes stress abrupt change as an important precursor characteristic for judging slip risk. However, under the high-temperature environment, when primary or secondary microcracks in the burned rock are influenced by the thermal expansion and contraction effect, transient quick closing phenomenon can occur, so that the local rigidity of the rock body is instantaneously enhanced, and a stress sensing device is triggered to record an unreal sudden increase response signal. The closing behavior of the thermally induced microstructure is often misjudged as a critical state before the slope enters the sliding, so that the false triggering of the early warning system is induced, or the unnecessary reinforcement operation is started in advance by the treatment system. Because the stress sudden increase caused by the thermal expansion has extremely strong transient characteristics and reversibility, the prior art lacks a mechanism for effectively distinguishing the real sliding response from the thermally-induced false positive signals, monitoring judgment deviation, protection resource mismatch and overload of an emergency response system are easy to cause, and accurate identification of other potential instability signs can be interfered when serious, so that the accuracy and economy of the overall slope safety control are reduced. Disclosure of Invention Therefore, the invention aims to solve the technical problem of poor accuracy and economy of the whole slope safety control in the prior art. In order to solve the technical problems, the invention provides a strip mine burning change cliffside slope protection treatment method based on structural response analysis, which comprises the following steps: establishing a thermodynamic coupling baseline, collecting continuous time sequence data of temperature, displacement and stress of a slope region, analyzing multi-source heat contribution of a heat source in a daily period, and modeling the influence of the multi-source heat on the response of the slope structure as an initial thermodynamic response baseline of the slope structure; based on a thermal response baseline, separating a thermal action domain from a force action domain, and extracting three characteristic parameters of contact stiffness increment, porosity reduction amplitude and acoustic emission silence window as identification indexes for distinguishing thermal action from force action response by analyzing closure behaviors of side slope rock micro-cracks under high temperature conditions; According to the identification index, carrying out space synchronization consistency analysis on response data of a plurality of monitoring points, screening out transient surge signals only appearing at a single monitoring point, ident