Ecological fragile area coal seam water inrush danger monitoring method and system based on repeated disturbance

Abstract

The invention discloses an ecologically fragile area coal seam water inrush danger monitoring method and system based on repeated disturbance, and relates to the technical field of mine water disaster prevention and control. The method comprises the following steps: comprehensively determining engineering geological conditions according to the vertical depth of a wind oxidation zone and coal seam characteristic parameters; performing numerical simulation by using the numerical model; based on the position of a fan roadway of each coal seam working face in a well field exploration diagram, the water-proof and waterproof coal and rock pillar setting under repeated disturbance of coal mining near a coal seam hidden outcrop in the ecologically fragile area is determined by utilizing the development heights of two zones and the height inhibition coefficients of two zones of a wind oxidation zone when the coal seam working faces are mined with different lengths; and monitoring the water inrush risk in the regional roadway according to the damage characteristics of the inclined mining roof of each working face. According to the invention, real-time and accurate monitoring of the water inrush danger of the working face near the coal seam hidden outcrop can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine water disaster prevention, and particularly relates to a coal seam water inrush danger monitoring method and system based on repeated disturbance in an ecologically fragile area. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] The coal measure stratum is hidden below the Paleogene stratum, and has a large mining thickness and a large inclination change, resulting in serious water inrush risk and hazard at the roof of the mine wind oxidation zone. The mine roof water inrush accident, as one of the coal mine safety accidents, is actually the final macroscopic performance of the water conducting fractured zone penetrating the aquiclude.

[0004] When mining near the coal seam hidden outcrop in the ecologically fragile area, the safety design of the water prevention and isolation coal rock pillar needs to be performed according to the water inrush danger to reduce the probability of accidents. The water inrush danger involves multiple factors, has strong uncertainty and is extremely dependent on the spatial and temporal resolution. It is difficult to determine the development height of the two zones and the water inrush danger under repeated mining near the coal seam hidden outcrop. The development height of the two zones near the working face of the coal seam hidden outcrop is often inconsistent with the actual situation, resulting in a large deviation in the judgment of the water inrush danger. Due to the lack of design for the water inrush danger of the water prevention and isolation coal rock pillar near the coal seam hidden outcrop in the ecologically fragile area under repeated disturbance, the mining roof water inrush accident occurs from time to time. The current research on the determination of the height of the two zones of the mining roof often comprehensively applies technical means such as field measurement, numerical simulation and similar material simulation. Although the above research has achieved rich results and has prevented the occurrence of the working face roof water inrush accident to a certain extent, the following shortcomings still exist: (1) Near the coal seam hidden outcrop in the northwest mining area, due to the weak lithology, the hole collapse accident easily occurs in the process of relying on the double-end plugging side leakage device and field peeping, so that the development height of the two zones under repeated mining near the working face of the coal seam outcrop cannot be obtained through field measurement.

[0005] (2) The working face near the coal seam hidden outcrop in the current northwest mining area often ignores the influence of repeated mining when designing the water prevention and isolation coal rock pillar and monitoring the water inrush danger. SUMMARY

[0006] In view of the shortcomings of the prior art, the present application aims to provide a coal seam water inrush danger monitoring method and system based on repeated disturbance in an ecologically fragile area, which can overcome the defect that the development height of the two zones near the working face of the coal seam hidden outcrop is ignored when predicting the height of the two zones of the mining roof, and accurately determine the development height of the two zones, thereby further realizing real-time and accurate monitoring of the water inrush danger near the working face of the coal seam hidden outcrop.

[0007] In order to achieve the above object, the present application is realized by the following technical scheme: The first aspect of the present application provides a coal seam water inrush risk monitoring method based on repeated disturbance in an ecological fragile area, comprising the following steps: Obtain the vertical depth of the wind oxidation zone and the coal seam soil sample characteristic parameters, and comprehensively determine the engineering geological conditions according to the vertical depth of the wind oxidation zone and the coal seam characteristic parameters; According to the actual situation of the engineering geological conditions, a numerical model is established, and numerical simulation is carried out by using the numerical model to obtain the development height of the two zones and the height inhibition coefficient of the wind oxidation zone when the different lengths of the coal seam working face are mined. Based on the position of the fan lane of each coal seam working face in the mine exploration line graph, the development height of the two zones and the height inhibition coefficient of the wind oxidation zone when the different lengths of the coal seam working face are mined are used to determine the water prevention and isolation coal rock pillar setting under the repeated disturbance of the coal mining near the coal seam buried outcrop in the ecological fragile area. According to the water prevention and isolation coal rock pillar setting under the repeated disturbance of the coal mining near the coal seam buried outcrop in the ecological fragile area, the water inrush risk of each working face is monitored according to the roof damage characteristics of the mining.

[0008] Further, the specific steps of obtaining the vertical depth of the wind oxidation zone and the coal seam soil sample characteristic parameters are as follows: Based on the rock and soil samples and coal samples obtained by drilling engineering, physical and mechanical parameter testing and testing are carried out to obtain coal sample testing parameters, and the vertical depth of the wind oxidation zone is determined according to the coal sample testing parameters. Carrying out indoor macro and micro experiments to obtain the coal seam soil sample characteristic parameters.

[0009] Further, the coal sample testing parameters include moisture, ash content, volatile matter, oxygen, calorific value and apparent density; the coal seam soil sample characteristic parameters include soil sample types, internal structure looseness and water richness.

[0010] Further, the nearest mine exploration line to each coal seam buried outcrop is determined according to the mine comprehensive mining engineering plan, and then the position of the fan lane of each coal seam working face in the mine exploration line graph is determined.

[0011] Further, the specific steps of establishing a numerical model according to the actual situation of the engineering geological conditions and carrying out numerical simulation by using the numerical model are as follows: According to the engineering geological conditions and the actual situation of each coal seam working face, a numerical model is established by using the Mohr-Coulomb constitutive model; Assigning corresponding physical and mechanical parameters to each rock layer and each coal seam in the numerical model, and setting boundary conditions; Carrying out numerical simulation on each working face coal seam until all mining is completed, and counting the development height of the two zones when the different lengths of the coal seam working face are mined.

[0012] Further, the wind oxidation zone two-zone height inhibition coefficient obtaining step is: The crack mining ratio and the caving mining ratio values near the concealed outcrop of each coal seam are calculated. The wind oxidation zone two-zone height inhibition coefficient is calculated based on the crack mining ratio and the caving mining ratio values.

[0013] Further, based on the position of the fan roadway of each coal seam working face in the mine field exploration line map, the specific steps for determining the specific setting of the waterproof coal rock pillar under repeated mining disturbance near the concealed outcrop of the coal seam in the ecological fragile zone are determined by using the two-zone development height when the working face of each coal seam is mined for different lengths and the wind oxidation zone two-zone height inhibition coefficient. The two-zone development height obtained by numerical simulation under repeated mining of the working face near the coal seam outcrop is plotted in the mine field exploration line map. The type and thickness of the waterproof coal rock pillar under repeated mining disturbance near the concealed outcrop of the coal seam are determined by combining the existing standards, the mine field exploration line map and the wind oxidation zone two-zone height inhibition coefficient.

[0014] The second aspect of the present application provides a repeated disturbance-based ecological fragile zone coal seam water inrush risk monitoring system, comprising: A data acquisition module configured to acquire the wind oxidation zone vertical depth and the coal seam soil sample characteristic parameters, and comprehensively determine the engineering geological condition according to the wind oxidation zone vertical depth and the coal seam characteristic parameters. A numerical simulation module configured to establish a numerical model according to the actual situation of the engineering geological condition, and perform numerical simulation by using the numerical model to obtain the two-zone development height when the working face of each coal seam is mined for different lengths and the wind oxidation zone two-zone height inhibition coefficient. A component design module configured to determine the setting of the waterproof coal rock pillar under repeated mining disturbance near the concealed outcrop of the coal seam in the ecological fragile zone based on the position of the fan roadway of each coal seam working face in the mine field exploration line map, and using the two-zone development height when the working face of each coal seam is mined for different lengths and the wind oxidation zone two-zone height inhibition coefficient. A risk monitoring module configured to monitor the water inrush risk in the regional roadway according to the mining roof damage characteristics of each working face based on the setting of the waterproof coal rock pillar under repeated mining disturbance near the concealed outcrop of the coal seam in the ecological fragile zone.

[0015] The third aspect of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is suitable for being loaded and executed by a processor to perform the steps in the repeated disturbance-based ecological fragile zone coal seam water inrush risk monitoring method as described in the first aspect of the present application.

[0016] The fourth aspect of the present application provides a computer device, which comprises: A processor suitable for executing a computer program. The computer readable storage medium stores a computer program, and the computer program is executed by the processor to realize the coal seam water inrush risk monitoring method based on repeated disturbance in an ecological fragile area according to the first aspect of the application.

[0017] The above one or more technical solutions have the following beneficial effects: The application discloses a coal seam water inrush risk monitoring method and system based on repeated disturbance in an ecological fragile area. First, physical and mechanical parameter testing and chemical testing are carried out on rock and soil samples and coal samples based on drilling engineering to determine the depth of the wind oxidation zone. Indoor macro and micro experiments are carried out, and isopach maps of the roof bedrock, gravel and red soil aquifuge of each coal seam are drawn to comprehensively determine the engineering geological conditions. Based on a mine comprehensive mining and excavation engineering plan, the nearest mine field exploration line from each coal seam outcrop is determined, and the position of the fan lane of each coal seam working face in the mine field exploration line map is determined. The basic physical and mechanical parameters of each rock sample above each coal seam working face near the coal seam concealed outcrop are obtained. A numerical model is established based on the actual fan lane position of each coal seam working face, the coal seam inclination angle, the length of the tendency and other actual conditions. Based on this, FLAC3D numerical simulation under the repeated disturbance of coal mining near the ecological fragile area coal seam concealed outcrop is carried out. The development height of the two zones is calculated when each working face is mined for different lengths. The crack mining ratio and the collapse mining ratio near the coal seam concealed outcrop are calculated, and the two-zone height inhibition coefficient of the wind oxidation zone is proposed. Then, the development height of the two zones is drawn in the mine field exploration line CAD diagram, and the waterproof coal rock pillar near the coal seam concealed outcrop under the repeated disturbance of coal mining in the ecological fragile area is determined based on the above data and relevant specifications. Then, according to the working face mining roof damage characteristics, inclined boreholes are constructed in the direction of the working face outside in the roadway in the area, and various types of sensors are arranged at different depths to monitor the water inrush risk. This method has important scientific research significance and application value in reducing the water inrush accident rate, ensuring the safety of underground workers and promoting the development of mine engineering mechanics and water disaster prevention technology.

[0018] The present application can overcome the defects that the repeated mining of the working face near the concealed outcrop of the coal seam is ignored when predicting the height of the two zones of the mining-induced roof near the working face of the concealed outcrop of the coal seam in the ecologically fragile area, and further realizes the real-time and accurate monitoring of the water inrush risk of the working face near the concealed outcrop of the coal seam. The boundary of the wind-oxidation zone is determined through indoor experiments, the types of the soil samples, the internal structure loosening degree and the water enrichment strength are judged, and the physical and mechanical parameters of the rock layer above each working face near the concealed outcrop of the coal seam are obtained, and then the numerical model established according to the actual length, angle and the like of each working face is endowed with the parameters, and the development height of the two zones can be accurately determined based on the FLAC3D numerical simulation software, and the two-zone height inhibition coefficient of the wind-oxidation zone is proposed, which can save the numerical simulation workload and more accurately obtain the development height of the two zones. The water-prevention and water-resisting coal rock pillars under the repeated disturbance of the coal mining near the concealed outcrop of the coal seam in the ecologically fragile area can be determined according to the above information and related specifications, and the water inrush risk can be monitored by arranging various types of sensors in the roadway in the area.

[0019] Advantages of the additional aspects of the present application will be partially given in the following description, partially will become apparent from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 The flow chart of the coal water inrush risk monitoring method in the ecologically fragile area based on the repeated disturbance in the embodiment one of the present application. DETAILED DESCRIPTION

[0022] It should be noted that the following detailed description is exemplary and is intended to provide further description of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0023] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof; With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0024] Embodiment one The embodiment one of the present application provides a coal seam water inrush danger monitoring method based on repeated disturbance in an ecologically fragile area, as shown in the following steps. Figure 1 Step 1: Obtain the vertical depth of the wind oxidation zone and the coal seam soil sample characteristic parameters, and comprehensively determine the engineering geological conditions according to the vertical depth of the wind oxidation zone and the coal seam characteristic parameters.

[0025] Step 1.1: Based on the rock and soil samples and coal sample cores taken by drilling engineering, physical and mechanical parameter tests and tests are carried out to obtain coal sample test parameters, and the vertical depth of the wind oxidation zone is determined according to the coal sample test parameters.

[0026] In a specific embodiment, based on the rock and soil samples and coal sample cores taken by drilling engineering, physical and mechanical parameter tests are carried out, and the specific physical and mechanical parameter test items include Poisson's ratio, uniaxial compressive strength, uniaxial tensile strength, cohesion, shear strength, density, etc. The coal sample test parameters include moisture (M), ash content (A), volatile matter (V), oxygen (O), calorific value (Q) and apparent density, etc. The vertical depth of the wind oxidation zone is determined based on the above coal sample test parameters.

[0027] The vertical depth of the wind oxidation zone refers to the depth from the surface vertically downward to the level where the coal seam loses its mining value due to weathering and oxidation. The coal sample cores taken by drilling engineering are taken from different depths, and physical and mechanical parameter tests and tests are carried out on the coal sample cores at different depths. Since the wind oxidation zone coal sample cores are more broken, the ash content is higher, and the calorific value is lower, the significant difference can be used to determine the vertical depth of the wind oxidation zone.

[0028] Step 1.2: Carry out indoor macro and micro experiments to obtain coal seam soil sample characteristic parameters.

[0029] In a specific embodiment, the coal seam soil sample characteristic parameters include soil sample types, internal structure looseness and water-richness. Indoor macro and micro experiments are carried out, and sufer software is used to draw isopleth maps of the thickness of each coal seam roof bedrock, gravel and red soil water-resisting layer to comprehensively determine the engineering geological conditions. The indoor macro and micro experiments mainly include liquid limit and plastic limit measurement experiments, optimum water content measurement experiments, SEM and XRD micro experiments, etc. Based on this, the coal seam soil sample characteristic parameters are comprehensively judged, including soil sample types, internal structure looseness and water-richness.​

[0030] Step 1.3: Determine the engineering geological condition according to the vertical depth of the wind oxidation zone and the coal seam characteristic parameters.

[0031] The dimensions involved in the engineering geological condition include shallow stratum stability, shaft and roadway engineering design and construction conditions, hydrogeological conditions, gas and ground pressure disaster assessment conditions, coal mining method and engineering face layout conditions, etc. After obtaining the vertical depth of the wind oxidation zone and the coal seam characteristic parameters, the actual situation, expert experience and existing standards can be used for judgment, which will not be repeated here.

[0032] Step 2: Establish a numerical model according to the actual situation of the engineering geological condition, and use the numerical model for numerical simulation to obtain the height of the two zones and the height inhibition coefficient of the wind oxidation zone for different lengths of each coal seam working face.

[0033] Step 2.1: Establish a numerical model according to the engineering geological condition and the actual situation of each coal seam working face using the Mohr-Coulomb constitutive model.

[0034] In a specific embodiment, according to the engineering geological condition, the numerical model is established according to the actual situation of the fan lane position of each coal seam working face, the coal seam inclination, the inclination length, the thickness of each rock layer, etc. (obtained from historical records or existing data), and the Mohr-Coulomb constitutive model is selected. Since the Mohr-Coulomb constitutive model is an existing model in the field, it is common knowledge in the field to construct a numerical model based on the Mohr-Coulomb constitutive model according to known parameters, which will not be repeated here.

[0035] Step 2.2: Assign corresponding physical and mechanical parameters to each rock layer and each coal seam in the numerical model, and set boundary conditions.

[0036] Among them, the boundary conditions include displacement boundary, velocity boundary and stress boundary.

[0037] Step 2.3: Perform numerical simulation on each working face coal seam until all mining is completed, and record the height of the two zones for different lengths of each coal seam working face.

[0038] In a specific embodiment, FLAC3D numerical simulation is carried out, i.e. mining 300m along the strike from the working face cut, a total of 60 steps, each step mining 5m, after mining the overlying coal seam, continue to mine the adjacent underlying coal seam, until all the working face coal seams are mined, and the height of the two zones for different lengths of each coal seam working face is recorded.

[0039] Step 2.4: Calculate the height inhibition coefficient of the two zones of the wind oxidation zone.

[0040] Step 2.4.1: Calculate the numerical value of the crack mining ratio and the collapse mining ratio near each coal seam outcrop.

[0041] In a specific embodiment, the crack mining ratio and the caving mining ratio values near the concealed outcrop of each coal seam are calculated, and the formula is as follows: (1), (2).

[0042] In the formula, a is the caving mining ratio; b is the crack mining ratio; H c is the development height of the caving zone, in meters; H f is the development height of the water flowing fractured zone, in meters; and M is the thickness of the coal seam near the concealed outcrop of the coal seam, in meters.

[0043] Step 2.4.2: Calculate the two-zone height inhibition coefficients of the wind oxidation zone based on the crack mining ratio and the caving mining ratio values.

[0044] In a specific embodiment, the two-zone height inhibition coefficients of the wind oxidation zone are calculated based on the crack mining ratio and the caving mining ratio values, and the formula is as follows: (3), (4).

[0045] In the formula, c is the caving zone inhibition coefficient at the wind oxidation zone; d is the water flowing fractured zone inhibition coefficient at the wind oxidation zone; a1 is the caving mining ratio of the first layer of main mining coal seam below the wind oxidation zone and far from the wind oxidation zone; b1 is the crack mining ratio of the first layer of main mining coal seam below the wind oxidation zone and far from the wind oxidation zone; a j is the caving mining ratio of the jth (j = 2, 3, 4, 5…) layer of main mining coal seam below the wind oxidation zone and close to the wind oxidation zone; and b j is the crack mining ratio of the jth (j = 2, 3, 4, 5…) layer of main mining coal seam below the wind oxidation zone and close to the wind oxidation zone.

[0046] Based on the two-zone height inhibition coefficients of the wind oxidation zone, combined with field measurements, the two-zone height development prediction at the wind oxidation zone can be applied subsequently. Specifically, the reliability and accuracy of the subsequent two-zone height development prediction results at the wind oxidation zone can be verified.

[0047] Step 3: Based on the location of the fan lane of each coal seam working face in the mine field exploration line map, the two-zone development height when the working face of each coal seam is mined for different lengths and the two-zone height inhibition coefficients of the wind oxidation zone are used to determine the prevention and isolation of water-proof coal rock pillars near the concealed outcrop of the coal seam in the ecologically fragile area under repeated disturbance of coal mining.

[0048] In a specific embodiment, the area near the concealed outcrop of the coal seam in the ecologically fragile area refers to an area where the coal seam is covered by a thin layer of loose sediments, but the bedrock roof has approached the surface (the concealed outcrop) and its surrounding influence buffer zone determined by the geological mining conditions and ecological sensitivity. Its scope includes sensitive zones of hydraulic connection, high-risk areas of ecological degradation, and prone areas of engineering disasters, etc.

[0049] The sensitive zone of hydraulic connection is an area where the water-conducting fissures generated by coal seam mining can directly communicate with the surface and the coal-bearing aquifer, which is the core channel of groundwater leakage.

[0050] The high-risk area of ecological degradation depends directly on the surface vegetation and soil stability on the shallow groundwater. Once the groundwater level drops due to mining, it will trigger irreversible ecological disasters such as vegetation withering, land desertification, and wetland shrinking.

[0051] The prone area of engineering disasters has extremely thin and broken overburden, and mining can easily cause sudden subsidence, sand and water collapse, and other major safety accidents.

[0052] Step 3.1: Determine the location of the fan lane of each coal seam working face in the mine field exploration line map. Specifically, determine the nearest mine field exploration line to each coal seam concealed outcrop based on the mine comprehensive mining engineering plan, and then determine the location of the fan lane of each coal seam working face in the mine field exploration line map.

[0053] Step 3.1.1: Determine the nearest mine field exploration line to each coal seam concealed outcrop based on the mine comprehensive mining engineering plan.

[0054] In a specific embodiment, based on the mine comprehensive mining engineering plan, combined with the existing mine field exploration line position, further considering the driving direction of each coal seam working face, the nearest mine field exploration line to each coal seam concealed outcrop is determined, and then the mine field exploration line profile is drawn.

[0055] Step 3.1.2: Determine the location of the fan lane of each coal seam working face in the mine field exploration line map through the elevation data of the intersection of the fan lane of each coal seam working face and the mine field exploration line in the mine comprehensive mining engineering plan.

[0056] Step 3.2: Determine the prevention and isolation of water-proof coal rock pillars near the concealed outcrop of the coal seam in the ecologically fragile area under repeated disturbance of coal mining by using the development height of the two zones and the height inhibition coefficient of the two zones of the working face under different lengths of each coal seam.

[0057] Step 3.2.1: Correspondingly draw the development height of the two zones obtained by numerical simulation under repeated mining of the working face near the coal seam outcrop on the mine field exploration line CAD map.

[0058] Step 3.2.2: Based on existing standards and the combined information of the minefield exploration line map and the height inhibition coefficient of the two zones of wind oxidation, determine the type and thickness of the water-resistant coal-rock pillar to be left under repeated disturbances during mining near the concealed coal seam outcrop.

[0059] In one specific implementation method, existing standards such as the "Detailed Rules for Water Prevention and Control in Coal Mines" (2018) and the "Specifications for the Retention of Coal Pillars in Buildings, Water Bodies, Railways and Main Shafts and Coal Mining under Pressure" (2017) stipulate that the type of water-resistant coal-rock pillar to be retained under repeated mining disturbances near the concealed outcrop of the coal seam (waterproof safety coal (rock) pillar, sand-resistant safety coal (rock) pillar, and collapse-resistant safety coal (rock) pillar) and its retention thickness are determined by combining the vertical depth of the aeolian oxidation zone, the inhibition coefficient of the height of the two zones in the aeolian oxidation zone, the development height of the two zones when mining different lengths of each coal seam working face, the results of indoor macro- and micro-experiments, and the contour maps of the thickness of the bedrock, gravel, and laterite water-resistant layer of each coal seam roof. Step 4: Based on the water-proof coal and rock pillars left near the hidden coal seam outcrops in the ecologically fragile area due to repeated disturbance during coal mining, monitor the risk of water inrush in the regional roadways according to the roof damage characteristics of each working face during mining.

[0060] In one specific implementation, the high-risk area for water inrush can be determined by analyzing the development patterns of the "two zones" (water inrush zone and roof ridge) near the concealed coal seam outcrop, combined with a cross-sectional view. In the roadway within this area, inclined boreholes are drilled facing outwards from the working face, based on the characteristics of roof damage caused by mining along the working face's dip. Various types of sensors are then deployed at different depths within these boreholes to monitor the water inrush risk. The characteristics of roof damage caused by mining along the working face refer to the features exhibited along the development height of the "two zones" along the coal seam roof. Drilling towards the outwards from the working face allows for better placement of monitoring sensors, thus improving the monitoring of water inrush risk.

[0061] The method described in this embodiment has significant scientific research value and application value for reducing the rate of water inrush accidents, ensuring the safety of underground workers, and promoting the development of mining engineering mechanics and water hazard prevention technology.

[0062] The specific steps are as follows: Step 4.1: In the roadways on both sides of the high risk of water inrush in the coal mining face, construct inclined boreholes facing outwards from the working face according to the characteristics of roof failure caused by mining. There should be no less than 2 boreholes on each side of the roadway. The spacing between the boreholes along the direction of the working face should be 4-8m. The length of the monitoring boreholes should exceed the roof failure depth by 6-10m, and the inclination angle between the boreholes and the horizontal plane should be 40°-60°.

[0063] Step 4.2: In each monitoring borehole, set 4-6 different monitoring depths, and at each depth, place one pore water pressure sensor, one stress sensor, one water temperature sensor, and one strain sensor. The greater the borehole depth, the smaller the spacing between the monitoring depths.

[0064] Step 4.3: Obtain different categories of sensor data, and then analyze the monitoring index curve trend of different boreholes and different positions. If the index curve changes greatly in a short time, it is considered to have a certain water inrush risk, and based on this, the water inrush risk monitoring purpose can be achieved.

[0065] Embodiment two: The embodiment two of the present application provides a coal seam water inrush risk monitoring system based on repeated disturbance in an ecological fragile area, comprising: The data acquisition module is configured to obtain the vertical depth of the wind oxidation zone and the coal seam soil sample characteristic parameters, and comprehensively determine the engineering geological condition according to the vertical depth of the wind oxidation zone and the coal seam characteristic parameters; The numerical simulation module is configured to establish a numerical model according to the actual situation of the engineering geological condition, and perform numerical simulation by using the numerical model to obtain the two-zone development height and the wind oxidation zone two-zone height inhibition coefficient when each coal seam working face is mined to different lengths; The component design module is configured to determine the water-resisting and water-isolating coal rock pillar setting under repeated disturbance of coal mining near the concealed outcrop of the coal seam in the ecological fragile area based on the position of the fan lane in the mine exploration line graph of each coal seam working face, and the two-zone development height and the wind oxidation zone two-zone height inhibition coefficient when each coal seam working face is mined to different lengths; The risk monitoring module is configured to monitor the water inrush risk of each working face according to the damage characteristics of the mining roof in the regional roadway according to the water-resisting and water-isolating coal rock pillar setting under repeated disturbance of coal mining near the concealed outcrop of the coal seam in the ecological fragile area.

[0066] Embodiment three: The embodiment three of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is suitable for being loaded and executed by a processor to perform the steps in the water inrush risk monitoring method based on repeated disturbance in an ecological fragile area of the coal seam as described in the embodiment one of the present application.

[0067] Embodiment four: The embodiment four of the present application provides a computer device, which comprises: A processor suitable for executing a computer program; A computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the steps in the water inrush risk monitoring method based on repeated disturbance in an ecological fragile area of the coal seam as described in the embodiment one of the present application.

[0068] The steps and methods involved in the above embodiments two, three and four correspond to the embodiment one, and the specific implementation can be referred to the related description part of the embodiment one.

[0069] The above description is only specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for monitoring the risk of coal seam water inrush in ecologically fragile areas based on repeated perturbation, characterized in that, Includes the following steps: Obtain the vertical depth of the aeolian oxidation zone and the characteristic parameters of the coal seam soil samples, and comprehensively determine the engineering geological conditions based on the vertical depth of the aeolian oxidation zone and the characteristic parameters of the coal seam; A numerical model was established based on the actual engineering geological conditions, and numerical simulation was performed using the numerical model to obtain the development height of the two zones and the inhibition coefficient of the height of the wind oxidation zone when mining different lengths of each coal seam working face. Based on the location of the ventilation roadway of each coal seam working face in the mine field exploration line map, the water-proof coal and rock pillars to be left under repeated disturbance of mining near the hidden outcrop of the coal seam in the ecologically fragile area are determined by using the development height of the two zones and the inhibition coefficient of the height of the two zones of the wind oxidation zone when mining different lengths of each coal seam working face. Based on the principle of leaving water-resistant coal and rock pillars near the hidden coal seam outcrops in ecologically fragile areas under repeated disturbances during mining, the risk of water inrush is monitored in the regional roadways according to the roof damage characteristics of each working face during mining.

2. The method for monitoring the risk of coal seam water inrush in ecologically fragile areas based on repeated perturbation as described in claim 1, characterized in that, The specific steps for obtaining the vertical depth of the aeolian oxidation zone and the characteristic parameters of coal seam soil samples are as follows: Based on the physical and mechanical parameter tests and analyses of the rock and soil samples and coal core samples taken from the drilling project, the coal sample analysis parameters were obtained, and the vertical depth of the aeolian oxidation zone was determined based on the coal sample analysis parameters. Indoor macro- and micro-scale experiments were conducted to obtain characteristic parameters of coal seam soil samples.

3. The method for monitoring the risk of coal seam water inrush in ecologically fragile areas based on repeated perturbation as described in claim 2, characterized in that, The parameters for coal sample analysis include moisture, ash, volatile matter, oxygen, calorific value, and apparent density; the parameters for coal seam soil sample characteristics include soil type, degree of looseness of internal structure, and water-bearing capacity.

4. The method for monitoring the risk of coal seam water inrush in ecologically fragile areas based on repeated perturbation as described in claim 1, characterized in that, Based on the mine's comprehensive mining engineering plan, the exploration line closest to the hidden outcrops of each coal seam is determined, and then the location of the ventilation roadway of each coal seam working face on the exploration line map is determined.

5. The method for monitoring the risk of coal seam water inrush in ecologically fragile areas based on repeated perturbation as described in claim 1, characterized in that, The specific steps for establishing a numerical model based on the actual engineering geological conditions and conducting numerical simulations using the numerical model are as follows: Numerical models were established using the Mohr-Coulomb constitutive model based on engineering geological conditions and the actual working conditions of each coal seam. Assign corresponding physical and mechanical parameters to each rock stratum and coal seam in the numerical model, and set boundary conditions; Numerical simulations were conducted on the coal seams of each working face until all mining was completed, and the development height of the two zones was statistically analyzed when the working face of each coal seam was mined for different lengths.

6. The method for monitoring the risk of coal seam water inrush in ecologically fragile areas based on repeated perturbation as described in claim 1, characterized in that, The steps for obtaining the inhibition coefficient of the two zones of the wind oxidation zone are as follows: Calculate the fracturing ratio and scraping ratio near the concealed outcrops of each coal seam; The height inhibition coefficient of the two zones of the wind oxidation zone was calculated based on the fracturing ratio and the slumping ratio.

7. The method for monitoring the risk of coal seam water inrush in ecologically fragile areas based on repeated perturbation as described in claim 1, characterized in that, Based on the location of the ventilation roadway of each coal seam working face on the minefield exploration line map, the specific steps for determining the water-resistant coal-rock pillar retention under repeated mining disturbances near the concealed outcrop of the ecologically fragile coal seam are as follows, utilizing the development height of the two zones and the inhibition coefficient of the height of the two zones of the aeolian oxidation zone when mining different lengths of each coal seam working face: The development heights of the two zones obtained from numerical simulation under repeated mining near the coal seam outcrop are plotted on the minefield exploration line map. The type and thickness of the water-resistant coal-rock pillar to be left under repeated disturbances during mining near the concealed coal seam outcrop are determined by combining existing standards with the exploration line map of the coalfield and the height inhibition coefficient of the two zones of wind oxidation.

8. A monitoring system for coal seam water inrush hazard in ecologically fragile areas based on repeated perturbations, characterized in that, include: The data acquisition module is configured to acquire the vertical depth of the aeolian oxidation zone and the characteristic parameters of the coal seam soil samples, and to comprehensively determine the engineering geological conditions based on the vertical depth of the aeolian oxidation zone and the characteristic parameters of the coal seam. The numerical simulation module is configured to establish a numerical model based on the actual engineering geological conditions, and to use the numerical model to perform numerical simulation to obtain the development height of the two zones and the inhibition coefficient of the height of the wind oxidation zone when mining different lengths of each coal seam working face. The component design module is configured to determine the water-proof coal and rock pillars to be left near the hidden outcrops of the coal seam in the ecologically fragile area under repeated disturbances during mining, based on the location of the ventilation roadway of each coal seam working face on the mine field exploration line map and the development height of the two zones and the inhibition coefficient of the height of the two zones of the wind oxidation zone when mining different lengths of each coal seam working face. The hazard monitoring module is configured to monitor the risk of water inrush in regional roadways based on the characteristics of roof damage caused by repeated mining near the hidden coal seam outcrops in ecologically fragile areas.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program adapted to be loaded by a processor and executed as described in any one of claims 1-7: a method for monitoring the risk of coal seam water inrush in ecologically vulnerable areas based on repeated perturbations.

10. A computer device, characterized in that, include: A processor, adapted to execute computer programs; A computer-readable storage medium storing a computer program, which, when executed by the processor, implements the method for monitoring the risk of coal seam water inrush in ecologically fragile areas based on repeated perturbation as described in any one of claims 1-7.

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