CN-122014349-A - Hierarchical differential supporting method for deep mine stope

CN122014349ACN 122014349 ACN122014349 ACN 122014349ACN-122014349-A

Abstract

The invention discloses a grading differential supporting method for deep mine stope, which relates to the technical field of mine engineering and comprises the following steps: and acquiring the change data, the displacement increment data and the mining time record of surrounding rock displacement of different sections of the stoping roadway, sorting the acquired data according to a uniform time sequence to form a section deformation continuous data set, and reserving original deformation abrupt fragments in the section deformation continuous data set. According to the method, the section deformation continuous data set is constructed, the mutation characteristics are extracted, the dynamic identification and evolution tracking of the surrounding rock deformation state are realized, the roadway is divided into different control sections according to the mutation degree, and the support parameters are set in a differentiated mode, so that the support configuration is adjusted in real time along with the surrounding rock state, the support response precision and timeliness are improved, and the long-term stability of the deep stoping roadway is ensured.

Inventors

LI HUAIBIN
DAI BIBO
ZHAO XINGDONG
ZHAO HAIYANG
PENG JUN
ZHU QIANKUN
ZHAO YUEMAO
TANG MINGXUAN

Assignees

安徽理工大学
中钢集团马鞍山矿山研究总院股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260313

Claims (8)

1. The grading differential supporting method for the deep mine stope is characterized by comprising the following steps of: Acquiring change data, displacement increment data and mining time records of surrounding rock displacement of different sections of a stoping roadway, sorting the acquired data according to a unified time sequence to form a section deformation continuous data set, and reserving original deformation mutation fragments in the section deformation continuous data set; Calculating displacement increment difference between adjacent moments according to a fixed short time interval based on a section deformation continuous data set, extracting the amplitude, duration and occurrence frequency of displacement mutation, and forming a section mutation feature list; Based on the section mutation feature list, analyzing the change trend of mutation features in adjacent time periods along time sequence, and calculating the mutation development direction, the expansion speed and the continuity to form mutation evolution records; Dividing different sections of the stoping roadway into a basic control section, a reinforced control section and a key control section according to mutation evolution degree according to mutation evolution records, and respectively setting support density, support spacing and construction time sequence parameters according to mutation evolution characteristics of each section to form a grading differential support parameter table; Based on the grading differential support parameter table, advanced support is implemented on the heavy control section, support density optimization is implemented on the reinforced control section, original support configuration is kept on the basic control section, and the section mutation characteristic list is continuously updated based on the section deformation continuous data set.
2. The deep mine stoping roadway grading differential support method of claim 1, wherein the section deformation continuous data set forming step is as follows: in the construction and stoping process of a deep mine stoping roadway, determining the range of a monitoring section according to surrounding rock characteristics, burial depth conditions and mining disturbance intensity, setting fixed monitoring points along the length direction of the roadway, and synchronously recording the surface displacement, internal displacement and mining operation information of the surrounding rock at the positions of the top, two sides and a bottom plate of the surrounding rock; sorting the data of the change of the surrounding rock displacement along with time, the displacement increment data and the mining time record according to a unified time reference, and arranging the surrounding rock displacement along with time by strip in a time sequence as a leading sequence to form a basic time sequence data set; sequentially linking the basic time sequence data sets of different sections, keeping the time axis continuous, and marking the starting time, the ending time, the displacement increment amplitude and the duration of the original abrupt change segment to form a section deformation continuous data set; and carrying out structural arrangement on the section deformation continuous data set, and arranging the displacement change, the displacement increment and the mining time record in a correlated way through a time index to form the section deformation continuous data set with time consistency and space correlation.
3. The grading differential supporting method for deep mine stope according to claim 2, wherein the arrangement of the section deformation continuous data set further comprises the steps of carrying out uniform time alignment and unit conversion on displacement data recorded by each monitoring point in the data integration process, keeping a time format consistent, expressing displacement in millimeter units, classifying and marking mining event types, and keeping the original form of a mutation fragment in the section deformation continuous data set, so that the time, duration and displacement increment of mutation are kept in complete corresponding relation in subsequent analysis.
4. The deep mine stoping roadway grading differential support method of claim 2, wherein the step of extracting the abrupt change feature based on the segment deformation continuous dataset comprises the steps of: Selecting a fixed short time interval according to the uniform time step, reading surrounding rock displacement values at adjacent moments in a section point by point, and calculating displacement change values between adjacent records as displacement increment difference; according to the change trend of the continuous increment difference, identifying the time period of abnormal amplification or abrupt change, and marking mutation starting time, mutation ending time, mutation maximum amplitude and corresponding mining records to form a mutation time period set; counting the occurrence frequency of mutation events of each section according to a time sequence, and recording mutation amplitude level distribution and duration distribution, so that mutation activity rules are completely reflected in a time dimension; And (3) summarizing and registering mutation amplitude, duration and occurrence frequency information to form a section mutation characteristic list, and completely reserving abnormal displacement peaks in a short time in the list for subsequent analysis.
5. The deep mine stoping roadway grading differential support method of claim 4, wherein the mutation evolution record forming steps are as follows: Rearranging mutation events in the section mutation feature list according to a time sequence, establishing a time-continuous mutation sequence, and forming a unified time sequence set by taking time as an index; Taking time as a main line and taking a section as a unit, comparing mutation amplitude, mutation duration and mutation occurrence frequency changes in adjacent time periods to form a mutation change trend table, and recording the corresponding relation between mutation changes and mining processes by combining mining event types; Identifying the expansion direction and expansion speed of mutation in a roadway space according to a mutation change trend table, marking a mutation starting section and a mutation ending section, and recording a space distance and a time interval to reflect a mutation propagation rule; Comprehensively arranging the time trend and the spatial expansion result to form mutation evolution records, and recording mutation occurrence time, mutation duration time, mutation amplitude, mutation occurrence frequency, expansion direction and expansion speed to reflect the surrounding rock deformation evolution process.
6. The method for hierarchical differential support of deep mine stoping roadway according to claim 5, wherein in the formation process of the mutation evolution record, the mutation expansion direction and the mutation expansion speed are identified based on the roadway space position, the mutation propagation path is determined by comparing the time interval and the space distance of the mutation event of the adjacent sections, and the propagation characteristics of the mutation in the roadway trend, the tendency and the top-bottom plate direction are recorded in the mutation evolution record.
7. The hierarchical differential support method for deep mine stope according to claim 5, wherein the step of forming the hierarchical differential support parameter table is as follows: Analyzing mutation amplitude, mutation duration, mutation occurrence frequency, mutation expansion direction, mutation expansion speed and mutation continuity of each section according to mutation evolution records, and judging whether the section surrounding rock is in a stable stage, an acceleration stage or an expansion stage to form a mutation evolution degree evaluation result; Dividing a roadway into a basic control section, a reinforced control section and a key control section according to mutation evolution degree, and marking the distribution position and mutation type of each section in a roadway layout; respectively setting supporting density, supporting spacing and construction time sequence parameters according to abrupt change evolution characteristics of different sections, adopting high-strength supporting measures in key control sections, optimizing the supporting density in a reinforced control section, and keeping conventional configuration in a basic control section; and summarizing the support parameters of each section into a grading differential support parameter table, and recording the section types, the support parameters and mutation indexes.
8. The hierarchical differential supporting method for deep mine stoping roadway of claim 7, wherein the supporting and dynamic adjusting steps based on the hierarchical differential supporting parameter table are as follows: Combining mutation evolution record and a section deformation continuous data set, identifying the position and mutation stage of an important control section, implementing advanced support before the mining disturbance effect arrives, and forming a closed constraint system by adopting a high-strength anchor rod, a high-prestress anchor cable and thick-layer sprayed concrete; according to the abrupt evolution characteristics, support density optimization is implemented on the reinforced control section, the distance between the anchor rods and the anchor cables is adjusted, and a transverse reinforcing belt is additionally arranged, so that the bearing capacity and the restraining force of a support system are improved, and the support construction and the stoping operation are kept synchronous; the original supporting configuration of the foundation control section is kept, and an anchor rod, a metal net and sprayed concrete combined supporting structure is adopted to synchronously monitor the deformation change of surrounding rock; and continuously updating the mutation characteristic list by using the section deformation continuous data set, analyzing mutation amplitude and frequency change, and dynamically revising the grading differential support parameter list.

Description

Hierarchical differential supporting method for deep mine stope Technical Field The invention relates to the technical field of mine engineering, in particular to a grading differential supporting method for deep mine stope. Background The deep mine stoping roadway grading differential support is characterized in that in the deep mine stoping process, aiming at the characteristics of large burial depth, high ground stress level, complex surrounding rock structure and obvious influence of mining, a uniform parameter and single form support mode is not adopted, the roadway surrounding rock stable state is judged in a grading manner according to the differences of different sections of the roadway in the aspects of stress concentration degree, surrounding rock integrity, deformation rate, mining disturbance intensity and the like, the supporting intensity, supporting form and supporting time sequence matched with the mechanical characteristics of each section are respectively configured on the basis, the high-risk section is subjected to reinforcement, encryption or advanced implementation, the medium-risk section is subjected to coordinated transition support, and the low-risk section is subjected to basic support, so that the transition from uniform supporting to zonal response, grading application and differential implementation of roadway surrounding rock control is realized under the condition that stoping disturbance continuously evolves. The prior art has the following defects that in the prior art, aiming at the grading judgment of the surrounding rock stable state of a deep mine stoping roadway, the monitoring data is generally subjected to smooth processing in a sliding time average mode and the like based on time series data of the surrounding rock deformation or deformation rate so as to weaken the influence of instantaneous disturbance on a judgment result. However, under deep high ground stress and high mining disturbance conditions, local surrounding rock may experience abnormal sudden rises in deformation rate within a very short time window, which reflect early signs of rapid deterioration of surrounding rock structure or abrupt stress state changes, but in prior art classification processes, the above extreme deformation rate peaks tend to be attenuated or even masked by the sliding time averaging process, resulting in the section still being marked into non-high grade control areas during the classification decision phase. Along with continuous superposition of stoping disturbance, surrounding rock enters a stage of continuous amplification of deformation rate, and original support configuration cannot meet the rapidly-increased deformation requirement due to insufficient level matching, so that the deformation of the surrounding rock breaks through the support allowable deformation limit in a short time, and finally the integral destruction of the surrounding rock structure is initiated, so that the irreversible instability problem that the surrounding rock is difficult to recover through subsequent support adjustment is formed. The above information disclosed in the background section is only for enhancement of understanding of the background of the disclosure and therefore it may include information that does not form the prior art that is already known to a person of ordinary skill in the art. Disclosure of Invention The invention aims to provide a grading differential supporting method for deep mine stope roadways, which aims to solve the problems in the background technology. In order to achieve the purpose, the invention provides the technical scheme that the grading differential supporting method for the deep mine stope comprises the following steps of: acquiring change data, displacement increment data and mining time records of surrounding rock displacement of different sections of a stoping roadway, sorting the acquired data according to a unified time sequence to form a section deformation continuous data set, and reserving original deformation mutation fragments in the section deformation continuous data set for subsequent analysis; Based on the section deformation continuous data set, calculating displacement increment difference between adjacent moments according to a fixed short time interval, extracting the amplitude, duration and occurrence frequency of displacement mutation, and forming a section mutation characteristic list, so that abnormal displacement peak values occurring in a short time are completely reserved in data processing; Based on the section mutation feature list, analyzing the change trend of mutation features in adjacent time periods along time sequence, calculating mutation development direction, expansion speed and continuity, and forming mutation evolution records for reflecting the evolution process from instantaneous deformation to continuous acceleration deformation of surrounding rock; Dividing different sections of the stoping roadway into a basic