Coal mine crustal stress measurement and analysis system

Abstract

The invention discloses a coal mine crustal stress measurement and analysis system, which relates to the field of coal mine crustal stress measurement and analysis and comprises a data acquisition module, a mining area lithology analysis module, a force change analysis module and a comprehensive support module. According to the method, the coal mine surrounding rock state is judged, analyzed and processed according to fault information, fold information and rock mass information, the coal mine surrounding rock state value is obtained, the coal mine stress state and deformation state are analyzed according to stress information and deformation information, and the coal mine force state difference value is obtained; the coal mine stress comprehensive state judgment analysis is performed on the coal mine surrounding rock shape value and the coal mine force shape difference value, the coal mine stress comprehensive state is compared with a set comprehensive state control value, corresponding supporting measures are taken for coal mines in different stress comprehensive states, and influence factors of surrounding rock masses and structures can be comprehensively considered; the distribution state of the ground stress and strain of the coal mine in the working face weighting process can be considered, the stress state of the coal mine can be judged in time, and corresponding supporting measures can be provided for the coal mine in different stress states.

Description

Technical Field

[0001] The present invention relates to the field of coal mine in-situ stress measurement and analysis, and specifically to a coal mine in-situ stress measurement and analysis system. Background Art

[0002] With the increasing demand for resources, the scale of coal mining is constantly expanding. At the same time, coal mining is an extremely dangerous and complex process. The monitoring of coal in-situ stress plays a particularly important role in the safe mining of coal mines. The traditional method relies too much on manual stress measurement, which cannot guarantee the accuracy and timeliness of measurement. Therefore, the coal mine in-situ stress measurement and analysis system came into being.

[0003] When the traditional coal mine in-situ stress measurement and analysis system operates, it can only consider the coal mine in-situ stress situation, and fails to comprehensively consider the influencing factors of the surrounding rock mass and structure. It also cannot comprehensively consider the distribution state of coal mine in-situ stress in different states, and cannot accurately identify the coal mine stress state in multiple aspects, nor can it provide corresponding support measures for coal mines in different stress states. Therefore, how to more accurately identify the coal mine stress state in multiple aspects and timely provide corresponding support measures for coal mines in different stress states is the technical problem to be solved.

[0004] To solve the above defects, a technical solution is provided now. Summary of the Invention

[0005] To solve the technical problems raised in the above background art, the present invention is proposed. An embodiment of the present invention provides a coal mine in-situ stress measurement and analysis system.

[0006] The object of the present invention can be achieved by the following technical solutions: A coal mine in-situ stress measurement and analysis system includes a data acquisition module, a mining area lithology analysis module, a force change analysis module, and a comprehensive support module.

[0007] The data acquisition module is used to collect fault information, fold information, rock mass information, stress information, and deformation information, and send them to the mining area lithology analysis module and the force change analysis module;

[0008] The mining area lithology analysis module conducts determination and analysis processing on the fault information, fold information, and rock mass information to obtain the coal mine surrounding rock state value, and sends it to the comprehensive support module;

[0009] The force change analysis module conducts analysis on the stress information and deformation information to obtain the coal mine force state difference value, and sends it to the comprehensive support module;

[0010] The comprehensive support module conducts determination and analysis on the coal mine surrounding rock state value and the coal mine force state difference value to obtain the comprehensive coal mine stress state, compares it with the set comprehensive state control value, and makes corresponding support measures for coal mines in different comprehensive stress states.

[0011] Furthermore, the specific analysis steps of the coal mine surrounding rock state value are as follows:

[0012] Through ultrasonic imaging logging processing of the surrounding rock mass, a two-dimensional image of the surrounding rock mass is obtained. Edge detection algorithms are used on these images to highlight the edges of microfractures and bedding lines. After processing by the Hough transform algorithm, the straight-line equations representing bedding and microfractures are obtained, and their directions in the image are determined. The directions are represented by the slopes of the straight lines respectively. The slopes of the straight lines to microfractures and bedding are solved respectively and marked as k1 and k2. According to the formula the included angle θ between microfractures and bedding is obtained. The number value of microfractures in the two-dimensional image of the surrounding rock is acquired, divided by the average value of the included angle between microfractures and bedding, and multiplied by the adjustment factor coefficient to obtain the anisotropy value wy of the surrounding rock;

[0013] The structural anomaly value gzy of the coal mine area, the ore-forming state value wk of the surrounding rock mass, and the anisotropy value wy of the surrounding rock are calculated by formula to obtain the surrounding rock state value wzz of the coal mine.

[0014] Furthermore, the specific analysis steps of the structural anomaly value of the coal mine area and the ore-forming state value of the surrounding rock mass are as follows:

[0015] The obtained number values of large-scale severely unstable faults, medium-scale moderately unstable faults, and small-scale slightly unstable faults are combined with the fold development value zf and calculated by formula to obtain the structural anomaly value gzy of the coal mine area;

[0016] The surrounding rock mass is irradiated with X-rays, and different diffraction patterns are generated due to different mineral crystal structures. The positions, shapes, and intensities of the diffraction peaks of different diffraction patterns are analyzed to determine the types and relative contents of the minerals in the surrounding rock mass. The specific types of the minerals in the rock mass are diamond, corundum, topaz, quartz, feldspar, apatite, fluorite, calcite, and other minerals, and the corresponding numerical values are a1, a2, a3, a4, a5, a6, a7, a8, and a9 respectively, and a1 > a2 > a3 > a4 > a5 > a6 > a7 > a8 > a9. The respective numerical values of the surrounding rock mass are multiplied by the corresponding content values and summed up to obtain the ore stability state value kw of the surrounding rock mass. The peak height and peak width of the diffraction peak of the surrounding rock mass are marked as fg and fk, and normalized with the ore stability state value kw of the surrounding rock mass. According to the set formula wk = (b1×fg + b3×kw) / (b2×fk), the ore-forming state value wk of the surrounding rock mass is obtained, where b1, b2, and b3 are the set weight factor coefficients of the peak height, peak width of the diffraction peak of the surrounding rock mass, and the ore stability state value of the surrounding rock mass respectively.

[0017] Furthermore, the specific analysis steps of the fold development value, the number value of large-scale severely unstable faults, the number value of medium-scale moderately unstable faults, and the number value of small-scale slightly unstable faults are as follows:

[0018] Obtain the information of each fault in the coal mine area and determine the fault level. The fault information includes the vertical throw, horizontal throw, extension length, and fault width value of the fault. Calculate their weighted values and multiply by the corresponding scale factor coefficients to obtain the fault characteristic value. The fault information also includes the classification of faults by strike, specifically including strike faults, dip faults, and oblique faults. The corresponding fault characteristic value adjustment factor coefficients are a1, a2, and a3, where a1 < a2 < a3. Obtain the adjustment factor coefficient of each fault, multiply it by the fault characteristic value to obtain the fault characteristic running value. Compare the fault characteristic running value with the set reference fault characteristic running value range. When the fault characteristic running value is greater than the maximum value of the set fault characteristic running value range, the fault corresponds to a large-scale severe instability fault. When the fault characteristic running value is within the set fault characteristic running value range, the fault corresponds to a medium-scale moderate instability fault. When the fault characteristic running value is less than the minimum value of the set fault characteristic running value range, the fault corresponds to a small-scale mild instability fault, and count the large-scale severe instability faults, medium-scale moderate instability faults, and small-scale mild instability faults respectively;

[0019] Obtain the strike and dip angle of each rock stratum in the coal mine area. The strike value ranges from [0, 2π], and the dip angle value ranges from [0, π / 2]. Sort them in the order of acquisition time, subtract the earlier strike value and dip angle from the later ones, and record them as the strike difference and dip difference respectively. Sum them up to obtain the total strike difference zc and the total dip difference zq. Obtain the included angle value between the two wings of the fold in the coal mine area, the extension length value of the fold, and the vertical amplitude of the fold. Calculate them with the total strike difference zc and the total dip difference zq using a formula to obtain the fold development value zf.

[0020] Further, the specific analysis steps of the abnormal coal mine force state value are as follows:

[0021] After normalizing the abnormal coal mine stress state value myz, the abnormal coal mine deformation state value mxz, and the coal mine roadway asymmetry coefficient value BD, use the abnormal coal mine stress state value myz as the upper base length, the abnormal coal mine deformation state value mxz as the upper base length, and the coal mine roadway asymmetry coefficient value BD as the height to establish a trapezoid, and identify the perimeter of the formed trapezoid, which is marked as the abnormal coal mine force state value.

[0022] Further, the specific analysis steps of the abnormal coal mine stress state value are as follows:

[0023] Step 1: Drill several holes in the rock stratum near the coal mine working face. Set strain gauges at certain intervals and angles from the bottom to the top of the hole. The certain angle means horizontal and vertical placement. The horizontal stress gauge is used to monitor the stress condition in the vertical direction, and the vertical stress gauge is used to monitor the stress condition in the horizontal direction. Then, inject cement slurry into the holes to seal them, and record the pressure values of each stress gauge when the working face is subjected to pressure;

[0024] Step 2: Statistically analyze the pressure values of each stress gauge in the boreholes as the working face is subjected to abutment pressure, obtain the maximum stress values set at various depths and angles in several boreholes, add the horizontal stress and vertical stress at each depth of each borehole and divide by the total number of boreholes to obtain the horizontal stress mean value sy i at depth d i and the vertical stress mean value zy i . Here, i represents the number of each depth. Calculate the average borehole depth dj, the total horizontal stress mean value sz, and the total vertical stress mean value zz using formulas. Calculate the horizontal stress slope coefficient sx and the vertical stress slope coefficient cx using formulas. Calculate the horizontal stress intercept coefficient sj and the vertical stress intercept coefficient cj using formulas;

[0025] Step 3: Normalize the horizontal stress slope coefficient sx, the vertical stress slope coefficient cx, the horizontal stress intercept coefficient sj, and the vertical stress intercept coefficient cj. According to the set formula obtain the abnormal value of coal mine stress state myz, where y1, y2, y3, and y4 are the set reference weight factor coefficients for the horizontal stress slope coefficient, the vertical stress slope coefficient cx, the horizontal stress intercept coefficient, and the vertical stress intercept coefficient respectively;

[0026] Furthermore, the specific analysis steps for the abnormal value of coal mine deformation and the asymmetry coefficient value of coal mine roadways are as follows:

[0027] S1: Set several convergence deformation observation points in the coal mine roadway and the working face, record the deformation amounts of each observation point within time t m , perform mean value processing, and obtain the mean deformation amount B of the observation points within time t n , where m is the number of the monitoring time; m

[0028] S2: Take time as the abscissa and deformation amount as the ordinate, substitute the mean deformation amount into the two-dimensional coordinate system, and establish a quadratic polynomial fitting function B = f + h×t + k×t 2 , where f, h, and k are fitting coefficients. Establish a system of equations and solve the system of equations to obtain the values of the fitting coefficients a, b, and c;

[0029] S3: Take the derivative of the quadratic deformation amount function B = f + h×t + k×t 2 to obtain the deformation speed v = h×t + 2k×t. Redefine h as the deformation speed intercept coefficient and k as the deformation speed slope coefficient. Weightedly calculate the deformation speed intercept coefficient and the deformation speed slope coefficient and multiply by the corresponding correction factor coefficient to obtain the abnormal value of coal mine deformation mxz;

[0030] Set several pairs of convergence deformation observation points symmetrically on both sides of the coal mine roadway. The convergence deformation amount on the left side is B​x L , the convergence deformation amount of the right rib is B x R , obtained by formula calculation, the asymmetry coefficient value BD of the two ribs with logarithmic number x x , x is the logarithmic number of the two ribs of the coal mine roadway, and by formula calculation, the asymmetry coefficient value BD of the coal mine roadway is obtained.

[0031] Furthermore, the specific analysis steps for making corresponding support measures for coal mines in the above-mentioned different stress comprehensive states are as follows:

[0032] Normalize the coal mine surrounding rock state value and the coal mine stress state difference value, divide the coal mine surrounding rock state value by the coal mine stress state difference value, and multiply by the corresponding correction factor coefficient to obtain the coal mine stress comprehensive state value;

[0033] When the coal mine stress comprehensive state value is less than or equal to the control value XT1, a first-level coal mine stress state warning signal is generated, and the corresponding support measure is Measure 1;

[0034] When the coal mine stress comprehensive state value is greater than the control value XT1 and less than or equal to the control value XT2, a second-level coal mine stress state warning signal is generated, and the corresponding support measure is Measure 2;

[0035] When the coal mine stress comprehensive state value is greater than the control value XT2 and less than or equal to the control value XT3, a third-level coal mine stress state warning signal is generated, and the corresponding support measure is Measure 3;

[0036] When the coal mine stress comprehensive state value is greater than the control value XT3, a fourth-level coal mine stress state warning signal is generated, and the corresponding support measure is Measure 4.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] 1. By analyzing and processing the fault information, fold information and rock mass information to determine the state of the coal mine surrounding rock, the structural state difference value, the surrounding rock rock mass structure and ore state value, and the anisotropy value of the surrounding rock in the coal mine area are obtained. Then, by analyzing, the coal mine surrounding rock state value is obtained. By analyzing the stress information and deformation information, the coal mine stress state and deformation state are analyzed, and the coal mine stress state difference value, the coal mine deformation state difference value and the coal mine roadway asymmetry coefficient value are obtained. Then, by analyzing, the coal mine stress state difference value is obtained. It can comprehensively consider the influencing factors of the surrounding rock mass and structure, and can also consider the distribution state of the coal mine ground stress and strain during the weighting process of the working face, and can more accurately identify the coal mine stress state in multiple aspects.

[0039] 2. The present invention determines and analyzes the comprehensive state of coal mine stress by analyzing the state value of coal mine surrounding rock and the abnormal value of coal mine stress state, and compares it with the set comprehensive state control value, and takes corresponding support measures for coal mines in different comprehensive stress states, which can timely determine the stress state of coal mines and provide corresponding support measures for coal mines in different stress states, thereby enhancing the safety of coal mine mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. The following drawings are not deliberately drawn to scale according to actual dimensions, and the focus is on showing the gist of the present invention.

[0041] Figure 1 It is a system block diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings. Obviously, the described embodiments are only partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts also belong to the scope of protection of the present invention.

[0043] As Figure 1 shown, a coal mine in-situ stress measurement and analysis system includes a data acquisition module, a mining area lithology analysis module, a force change analysis module, and a comprehensive support module.

[0044] The data acquisition module is used to collect fault information, fold information, rock mass information, stress information, and deformation information, and send them to the mining area lithology analysis module and the force change analysis module.

[0045] When the mining area lithology analysis module receives the fault information, fold information, and rock mass information, and accordingly conducts the determination and analysis processing of the coal mine surrounding rock state, obtains the state value of the coal mine surrounding rock, and sends it to the comprehensive support module. The specific operation process is as follows:

[0046] Obtain the information of each fault in the coal mine area and determine the fault level. The fault information includes the vertical throw, horizontal throw, extension length and fault width value of the fault. Calculate their weighted values and multiply by the corresponding proportional factor coefficient to obtain the fault characteristic value. The fault information also includes the classification of faults by strike, specifically including strike faults, dip faults and oblique faults. The corresponding fault characteristic value adjustment factor coefficients are a1, a2 and a3, where a1 < a2 < a3. Obtain the adjustment factor coefficients of each fault, multiply them with the fault characteristic value to obtain the fault characteristic walking value. Compare the fault characteristic walking value with the set reference fault characteristic walking value range. When the fault characteristic walking value is greater than the maximum value of the set fault characteristic walking value range, the fault corresponds to a large-scale severe instability fault. When the fault characteristic walking value is within the set fault characteristic walking value range, the fault corresponds to a medium-scale moderate instability fault. When the fault characteristic walking value is less than the minimum value of the set fault characteristic walking value range, the fault corresponds to a small-scale mild instability fault. And count the large-scale severe instability faults, medium-scale moderate instability faults and small-scale mild instability faults respectively;

[0047] Obtain the strike and dip angle of each rock stratum in the coal mine area. The strike value ranges from [0, 2π], and the dip angle value ranges from [0, π / 2]. Among them, 0 degrees of strike represents the due north direction, and 360 degrees represents the due south direction. Sort them in the order of acquisition time. Subtract the strike value and dip angle of the earlier one from the later one, and record them as the strike difference and dip difference respectively. Sum them up to obtain the total strike difference zc and the total dip difference zq. Obtain the included angle value between the two wings of the fold in the coal mine area, the extension length value of the fold, and the vertical amplitude of the fold, and mark them as zy, ys and zf respectively. Normalize them with the total strike difference zc and the total dip difference zq. According to the formula zf = h1 / zy + h2×ys + h3×zf++h4×zc + h5×zq, obtain the fold development value zf, where h1, h2, h3, h4 and h5 are the set weight factor coefficients of the included angle value between the two wings of the fold, the extension length value of the fold, the vertical amplitude of the fold, the total strike difference and the total dip difference respectively. It should be noted that the vertical amplitude of the fold refers to the height difference between the core of the fold and the rock strata of the two wings;

[0048] Then calibrate the quantity values of the large-scale severe instability faults, medium-scale moderate instability faults and small-scale mild instability faults obtained respectively as dy, zz and xq, and after normalizing them with the fold development value zf, substitute them into the following formula: To obtain the structural anomaly value gzy of the coal mine area. In the formula, A01, A02, A03 and A04 are the preset weight coefficients of the quantity of large-scale severe instability faults, the preset weight coefficients of the quantity of medium-scale moderate instability faults, the preset weight coefficients of the quantity of small-scale mild instability faults and the preset weight coefficients of the fold development value respectively. A01 > A02 > A03, and the values of A01, A02, A03 and A04 are 4.058, 3.158, 2.586 and 3.121 respectively;

[0049] Obtain the X-ray of the surrounding rock mass. When the X-ray irradiates the rock mass, different diffraction patterns are generated due to the different mineral crystal structures. Analyze the position, shape and intensity of the diffraction peaks of different diffraction patterns to determine the types and relative contents of the minerals in the surrounding rock mass. The specific types of the minerals in the rock mass are diamond, corundum, topaz, quartz, feldspar, apatite, fluorite, calcite and other minerals, and the corresponding values are a1, a2, a3, a4, a5, a6, a7, a8 and a9 respectively, and a1 > a2 > a3 > a4 > a5 > a6 > a7 > a8 > a9. Multiply each value of the surrounding rock mass by the corresponding content value, accumulate and sum to obtain the stability value kw of the surrounding rock mass minerals. Obtain the peak height and peak width of the diffraction peaks of the surrounding rock mass, marked as fg and fk, and perform normalization processing with the stability value kw of the surrounding rock mass minerals. According to the set formula wk = (b1×fg + b3×kw) / (b2×fk), obtain the structure-mineral value wk of the surrounding rock mass, where b1, b2 and b3 are the set weight factor coefficients of the peak height, peak width of the diffraction peaks of the surrounding rock mass and the stability value of the surrounding rock mass minerals respectively;

[0050] Through the ultrasonic imaging logging processing of the surrounding rock mass, obtain the two-dimensional image of the surrounding rock mass. Use the edge detection algorithm for these images to highlight the edges of microfractures and bedding lines. After processing by the Hough transform algorithm, obtain the straight line equations representing the bedding and microfractures, determine their directions in the image, and represent the directions by the slopes of the straight lines respectively. Solve the slopes of the straight lines of the microfractures and bedding respectively, marked as k1 and k2, and according to the formula Obtain the included angle θ between the microfractures and the bedding. Obtain the numerical value of the microfractures in the two-dimensional image of the surrounding rock, perform division calculation with the average value of the included angle between the microfractures and the bedding, and multiply by the adjustment factor coefficient to obtain the anisotropy value wy of the surrounding rock. It should be noted that when the direction of the microfractures in the rock mass is parallel to the bedding, the strength value and elastic modulus are smaller than when the direction of the microfractures is perpendicular to the bedding;

[0051] Substitute the tectonic anomaly value gzy, the structure-mineral value wk of the surrounding rock mass and the anisotropy value wy of the surrounding rock in the coal mine area into the set formula model Obtain the surrounding rock value wzz of the coal mine, where X01, X02 and X03 are the set reference weight factor coefficients of the tectonic anomaly value, the structure-mineral value of the surrounding rock mass and the anisotropy value of the surrounding rock in the coal mine area respectively. The weight factor coefficients are used to balance the proportion weights of each item of data in the formula calculation, so as to promote the accuracy of the calculation results;

[0052] The force change analysis module is used to receive stress information and deformation information, analyze the stress state and deformation state of the coal mine, obtain the force anomaly value of the coal mine, and send it to the comprehensive support module. The specific analysis is as follows:

[0053] The specific analysis steps of the stress state of the coal mine are as follows:

[0054] Step 1: Drill a number of holes in the rock formation near the coal mining face. Set strain gauges at certain intervals and angles from the bottom to the top of the holes. The certain angle means horizontal and vertical placement, and the certain interval means 3m. The horizontal stress gauge is used to monitor the stress condition in the vertical direction, and the vertical stress gauge is used to monitor the stress condition in the horizontal direction. Then, inject cement slurry into the holes to seal them, and record the pressure values of each stress gauge when the face is subjected to pressure.

[0055] Step 2: Statistically analyze the pressure values of each stress gauge in the holes when the face is subjected to pressure, and obtain the maximum stress values set at various depths and angles in a number of holes. Add the horizontal and vertical stresses at each depth of each hole and divide by the total number of holes to obtain the average horizontal stress sy i at depth d i and the average vertical stress zy i of each hole. Here, i represents the number of each depth, i = 1, 2, 3... n1, and n1 is the maximum value of the depth number. According to the formula , obtain the average hole depth dj, the total average horizontal stress sz, and the total average vertical stress zz. According to the formula , obtain the horizontal stress slope coefficient sx and the vertical stress slope coefficient cx. According to the formula , obtain the horizontal stress intercept coefficient sj and the vertical stress intercept coefficient cj;

[0056] Step 3: Normalize the horizontal stress slope coefficient sx, the vertical stress slope coefficient cx, the horizontal stress intercept coefficient sj, and the vertical stress intercept coefficient cj. According to the set formula , obtain the abnormal value myz of the coal mine stress state, where y1, y2, y3, and y4 are the set reference weight factor coefficients of the horizontal stress slope coefficient, the vertical stress slope coefficient cx, the horizontal stress intercept coefficient, and the vertical stress intercept coefficient respectively. The specific values are 1.212, 2.125, 3125, and 1.544 respectively, and e is the natural constant, specifically 2.718;

[0057] The specific analysis steps of the coal mine strain state are as follows:

[0058] S1: Set a number of convergence deformation observation points in the coal mine roadway and the working face, record the deformation amounts of each observation point within time t m , perform mean value processing, and obtain the average deformation amount B n of the observation points within time t m . Here, m is the number of the monitoring time, m = 1, 2, 3... M, and M is the maximum value of the monitoring time number;

[0059] S2: Taking time as the abscissa and deformation as the ordinate, substitute the average value of deformation into the two-dimensional coordinate system to establish a quadratic polynomial fitting function B = f + h×t + k×t 2 , where f, h, and k are fitting coefficients, and establish a system of equations Solve the system of equations to obtain the values of the fitting coefficients a, b, and c;

[0060] S3: Differentiate the quadratic deformation function B = f + h×t + k×t 2 to obtain the deformation velocity v = h×t + 2k×t. Redefine h as the deformation velocity intercept coefficient and k as the deformation velocity slope coefficient. Weight the deformation velocity intercept coefficient and the deformation velocity slope coefficient and multiply by the corresponding correction factor coefficient to obtain the abnormal value of coal mine deformation shape mxz;

[0061] Set several pairs of convergence deformation observation points symmetrically on both sides of the coal mine roadway. The convergence deformation on the left side is B x L , and the convergence deformation on the right side is B x R . According to the set formula BD x = ∣B x L - B x R ∣ / [(B x L + B x R ) / 2] to obtain the asymmetry coefficient value BD of the two sides with the logarithm number x. x is the logarithm number of the two sides of the coal mine roadway, x = 1, 2, 3... X, and X is the maximum value of the logarithm number of the two sides. According to the set formula x obtain the asymmetry coefficient value BD of the coal mine roadway; Obtain the asymmetry coefficient value BD of the coal mine roadway;

[0062] After normalizing the abnormal value of coal mine stress myz, the abnormal value of coal mine deformation shape mxz, and the asymmetry coefficient value BD of the coal mine roadway, use the abnormal value of coal mine stress myz as the upper base length, the abnormal value of coal mine deformation shape mxz as the upper base length, and the asymmetry coefficient value BD of the coal mine roadway as the height to establish a trapezoid, identify the perimeter of the formed trapezoid, and mark it as the abnormal value of coal mine force;

[0063] Receive the coal mine surrounding rock state value and the coal mine force state value through the comprehensive support module, and accordingly conduct the judgment and analysis of the comprehensive state of coal mine stress, and compare with the set comprehensive state control value to take corresponding support measures for coal mines in different stress comprehensive states. The specific analysis is as follows:

[0064] Normalize the coal mine surrounding rock state value and the coal mine force state value, divide the coal mine surrounding rock state value by the coal mine force state value, and multiply by the corresponding correction factor coefficient to obtain the comprehensive state value of coal mine stress;

[0065] Compare and analyze the comprehensive stress state value of the coal mine with the set comprehensive stress state control values XT1, XT2, and XT3 of the coal mine, where XT1, XT2, and XT3 increase in sequence;

[0066] When the comprehensive stress state value of the coal mine is less than or equal to the control value XT1, a first-level coal stress state warning signal is generated, and the corresponding support measure is a U-shaped steel support with a set width of y1 and a wall thickness of z1, a bolt support with a spacing of f1 and a bolt length of g1;

[0067] When the comprehensive stress state value of the coal mine is greater than the control value XT1 and less than or equal to the control value XT2, a second-level coal stress state warning signal is generated, and the corresponding support measure is a U-shaped steel support with a set width of y2 and a wall thickness of z2, a bolt support with a spacing of f2 and a bolt length of g2;

[0068] When the comprehensive stress state value of the coal mine is greater than the control value XT2 and less than or equal to the control value XT3, a third-level coal stress state warning signal is generated, and the corresponding support measure is a U-shaped steel support with a set width of y3 and a wall thickness of z3, a bolt support with a spacing of f3 and a bolt length of g3;

[0069] When the comprehensive stress state value of the coal mine is greater than the control value XT3, a fourth-level coal stress state warning signal is generated, and the corresponding support measure is a U-shaped steel support with a set width of y4 and a wall thickness of z4, a bolt support with a spacing of f4 and a bolt length of g4, where y1 > y2 > y3 > y4, z1 > z2 > z3 > z4, f1 < f2 < f3 < f4, g1 > g2 > g3 > g4;

[0070] The above is a description of the present invention and should not be considered a limitation thereof. Although several exemplary embodiments of the present invention have been described, those skilled in the art will readily understand that many modifications can be made to the exemplary embodiments without departing from the novel teachings and advantages of the present invention. Therefore, all such modifications are intended to be included within the scope of the present invention as defined by the claims. It should be understood that the above is a description of the present invention and should not be considered limited to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims. The present invention is defined by the claims and their equivalents.

Claims

1. A coal mine ground stress measurement and analysis system, characterized in that: include: Data acquisition module, used to collect fault information, fold information, rock mass information, stress information and deformation information, and send it to the mining area lithology analysis module and force-variation analysis module; The mining area lithology analysis module determines and analyzes the state of the surrounding rock of the coal mine based on the fault information, fold information and rock mass information, obtains the surrounding rock state value of the coal mine, and sends it to the comprehensive support module; The force-variation analysis module analyzes the stress and deformation information of the coal mine, obtains the force-variation value of the coal mine, and sends it to the comprehensive support module; The comprehensive support module conducts analysis on the comprehensive stress state of the coal mine based on the surrounding rock state and the force anomaly value of the coal mine, and compares them with the set comprehensive state control value, and takes corresponding support measures for coal mines with different comprehensive stress states.

2. A coal mine ground stress measurement and analysis system according to claim 1, characterized in that: The specific analysis steps of the surrounding rock state of the coal mine are as follows: The two-dimensional images of the surrounding rock mass are obtained by ultrasonic imaging logging. The edge detection algorithm is used to highlight the edges of microcracks and bedding lines. After being processed by the Hough transform algorithm, the straight line equations representing bedding and microcracks are obtained, and their directions in the image are determined. The directions are represented by the slopes of the straight lines, and the slopes of the straight lines to microcracks and bedding are solved, marked as k1 and k2 respectively. According to the formula The angle θ between microcracks and bedding is obtained, the number of microcracks in the two-dimensional image of the surrounding rock is obtained, and the value is divided by the average value of the angle between microcracks and bedding, and multiplied by the adjustment factor coefficient to obtain the anisotropy value wy of the surrounding rock; The structural anisotropy value gzy of the coal mine area, the structural anisotropy value wk of the surrounding rock mass and the anisotropy value wy of the surrounding rock are used to calculate the surrounding rock value wzz of the coal mine.

3. A coal mine ground stress measurement and analysis system according to claim 2, characterized in that: The specific analysis steps of the structural anomaly value and the surrounding rock mass structural ore value of the coal mine area are as follows: The obtained large-scale severe unstable fault number value, medium-sized moderately unstable fault number value and small-scale slightly unstable fault number value are combined with the fold development value zf and the formula is used to calculate the structural abnormality value gzy of the coal mine area; Obtain X-rays from the surrounding rock mass and irradiate the rock mass. Different diffraction patterns are produced due to different mineral crystal structures. The positions, shapes and intensities of the diffraction peaks of different diffraction patterns are analyzed to determine the types and relative contents of the surrounding rock mass minerals. The types of rock mass minerals include diamond, corundum, topaz, quartz, feldspar, apatite, fluorite, calcite and other minerals, and the corresponding values ​​are a1, a2, a3, a4, a5, a6, a7, a8 and a9, and a1>a2>a3>a4>a5>a6>a7> a8>a9, obtain each value of the surrounding rock mass and multiply it by the corresponding content value, accumulate and sum them, and get the surrounding rock mass ore stability value kw, obtain the peak height and peak width of the surrounding rock mass diffraction peak, mark them as fg and fk, and normalize them with the surrounding rock mass ore stability value kw, and according to the set formula wk=(b1×fg+b3×kw) / (b2×fk), get the surrounding rock mass ore structure value wk, where b1, b2 and b3 are the peak height and peak width of the surrounding rock mass diffraction peak and the set weight factor coefficients of the surrounding rock mass ore stability value, respectively.

4. A coal mine ground stress measurement and analysis system according to claim 3, characterized in that: The specific analysis steps of the fold development value, the number of large severe unstable faults, the number of medium moderately unstable faults and the number of small slightly unstable faults are as follows: The information of each fault in the coal mine area is obtained, and the fault level is determined. The fault information includes the vertical fault distance, horizontal fault distance, extension length and fault width of the fault. The fault information is weighted and multiplied by the corresponding proportional factor coefficient to obtain the fault characteristic value. The fault information also includes the strike division fault, which includes strike fault, dip fault and oblique fault. The corresponding fault characteristic value adjustment factor coefficients are a1, a2 and a3. The adjustment factor coefficients of each fault are obtained and multiplied with the fault characteristic value. Obtain the fault runoff value, compare the fault runoff value with the set reference fault runoff value interval, when the fault runoff value is greater than the set maximum value of the fault runoff value interval, the fault corresponds to a large severe unstable fault, when the fault runoff value is within the set fault runoff value interval, the fault corresponds to a medium moderately unstable fault, when the fault runoff value is less than the set minimum value of the fault runoff value interval, the fault corresponds to a small slightly unstable fault, and count the large severe unstable fault, medium moderately unstable fault and small slightly unstable fault respectively; The strike and dip of each rock layer in the coal mine area are obtained, with the strike value being [0, 2π] and the dip value being [0, π / 2]. The layers are sorted in chronological order, and the strike and dip values ​​of the layers in the later order are subtracted from the strike and dip values ​​of the layers in the earlier order, which are respectively counted as the strike difference value and dip difference value. The total strike difference value zc and the total dip difference value zq are summed up respectively, and the angle value between the two wings of the fold in the coal mine area, the extension length value of the fold, and the vertical amplitude of the fold are obtained. The fold development value zf is obtained by calculating the angle value with the total strike difference value zc and the total dip difference value zq.

5. A coal mine ground stress measurement and analysis system according to claim 1, characterized in that: The specific analysis steps of the coal mine force anomaly value are as follows: After normalizing the coal mine stress abnormal value myz, the coal mine deformation abnormal value mxz and the coal mine roadway asymmetry coefficient value BD, a trapezoid is established with the coal mine stress abnormal value myz as the upper base length, the coal mine deformation abnormal value mxz as the upper base length, and the coal mine roadway asymmetry coefficient value BD as the height. The perimeter of the trapezoid is identified and marked as the coal mine stress abnormal value.

6. A coal mine ground stress measurement and analysis system according to claim 5, characterized in that: The specific analysis steps of the stress state value of the coal mine are as follows: Step 1: Drill several holes in the rock formation near the coal mine working face, and set strain gauges at a certain spacing and angle from the bottom to the top of the hole. The certain angle refers to horizontal and vertical placement. The horizontal strain gauge is used to monitor the stress in the vertical direction, and the vertical strain gauge is used to monitor the stress in the horizontal direction. Then, the borehole is sealed by injecting cement slurry, and the pressure value of each strain gauge is recorded as the working face is pressed; Step 2: Count the pressure values ​​of each stress gauge of the borehole as the working surface presses, and obtain the maximum stress values ​​of several boreholes at different depths and angles. Add the horizontal stress and vertical stress of each depth of each borehole and divide it by the total number of boreholes to obtain the maximum stress value of each depth of the borehole d. i The mean stress in the horizontal direction sy i and the vertical stress mean zy i , i represents the number of each depth, the formula is used to calculate the average drilling depth dj, the total mean horizontal stress sz and the total mean vertical stress zz, the formula is used to calculate the horizontal stress slope coefficient sx and the vertical stress slope coefficient cx, the formula is used to calculate the horizontal stress intercept coefficient sj and the vertical stress intercept coefficient cj; Step 3: Normalize the horizontal stress slope coefficient sx, vertical stress slope coefficient cx, horizontal stress intercept coefficient sj and vertical stress intercept coefficient cj according to the set formula The coal mine stress state value myz is obtained, where y1, y2, y3 and y4 are the reference weight factor coefficients set by the horizontal stress slope coefficient, the vertical stress slope coefficient cx, the horizontal stress intercept coefficient and the vertical stress intercept coefficient, respectively.

7. A coal mine ground stress measurement and analysis system according to claim 5, characterized in that: The specific analysis steps of the coal mine deformation anomaly value and the coal mine tunnel asymmetry coefficient value are as follows: S1: Set up several convergence deformation observation points in the coal mine tunnels and working faces, and record them at t m The deformation of each observation point within time is averaged and the result is obtained at t n The mean value of the deformation of the observation point within a certain time period is B m , m is the number of the monitoring time; S2: With time as the horizontal axis and deformation as the vertical axis, substitute the mean value of deformation into the two-dimensional coordinate system to establish a quadratic polynomial fitting function B = f + h × t + k × t 2 , where f, h and k are fitting coefficients, establish a system of equations, solve the system of equations, and obtain the values ​​of fitting coefficients a, b and c; S3: For the secondary deformation function B = f + h × t + k × t 2 Derivation is performed to obtain deformation velocity v = h × t + 2k × t, h is redefined as deformation velocity intercept coefficient, k is redefined as deformation velocity slope coefficient, deformation velocity intercept coefficient and deformation velocity slope coefficient are weighted and calculated, and multiplied by the corresponding correction factor coefficient to obtain coal mine deformation shape abnormality value mxz; Several pairs of convergence deformation observation points are set symmetrically on both sides of the coal mine tunnel. The convergence deformation of the left side is B x L , the convergence deformation of the right side is B x R , the formula is calculated, the two gangs are numbered as x asymmetric coefficient value BD x , x is the number of the two sides of the coal mine tunnel, and the asymmetry coefficient value BD of the coal mine tunnel is obtained by calculation using the formula.

8. A coal mine ground stress measurement and analysis system according to claim 1, characterized in that: The specific analysis steps for making corresponding support measures for coal mines with different comprehensive stress states are as follows: Normalize the surrounding rock state value and the abnormal force state value of the coal mine, divide the surrounding rock state value of the coal mine by the abnormal force state value of the coal mine, and multiply by the corresponding correction factor coefficient to obtain the comprehensive stress state value of the coal mine; When the comprehensive stress state value of the coal mine is less than or equal to the control value XT1, a first-level coal stress state warning signal is generated, and the corresponding support measure is measure one; When the comprehensive stress state value of the coal mine is greater than the control value XT1 and less than or equal to the control value XT2, a secondary coal stress state warning signal is generated, and the corresponding support measure is measure 2; When the comprehensive stress state value of the coal mine is greater than the control value XT2 and less than or equal to the control value XT3, a third-level coal stress state warning signal is generated, and the corresponding support measure is measure three; When the comprehensive stress state value of the coal mine is greater than the control value XT3, a level 4 coal stress state warning signal is generated, and the corresponding support measure is measure four.

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