Coal seam floor water inrush risk analysis and early warning method

Abstract

The invention relates to the technical field of coal mine water disaster prevention and control, and particularly discloses a coal seam floor water inrush risk analysis and early warning method. According to the method, the influence evaluation index corresponding to the geological structure layer of the target mine, the influence evaluation index corresponding to the surface of the water layer and the influence evaluation index corresponding to the mining layer of the coal seam are comprehensively analyzed, the water inrush danger level of the coal seam floor corresponding to the target mine is obtained, and corresponding early warning is carried out. The defect of the coal seam floor water inrush early warning analysis result in the prior art is overcome, and the water inrush risk analysis result is more accurate, comprehensive and reliable. And on the other hand, the timeliness and the real-time performance of detecting the water inrush danger of the coal seam floor by mine management personnel are improved to a great extent, meanwhile, the occurrence rate of mine safety accidents is reduced to the maximum extent, and reliable guarantee is provided for the continuity of coal mine production and personnel safety.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine water hazard prevention and control, and in particular to a coal seam floor water inrush hazard analysis and early warning method. Background Art

[0002] Coal seams are the main objects of coal mining, and water inrush from the coal seam floor is one of the most dangerous disasters in the process of coal mining. In coal mining operations, as mining activities continue to advance, the coal seam floor may face the threat of water inrush. This water inrush disaster may lead to a series of serious consequences, such as serious threats to the lives of underground workers, a large amount of coal resources being flooded and unable to be mined, and damage to mining equipment, which greatly affects the normal production and operation of coal mines. Therefore, it is very important to analyze and warn of the danger of water inrush from the coal seam floor.

[0003] Traditional analysis of water inrush risk in coal seam floors is usually done through the water inrush coefficient method, which is to judge the water inrush risk through a simple ratio between the water pressure of the aquifer and the thickness of the impermeable layer. However, this method ignores many other key factors, such as the complexity of geological structure, the degree of damage to the floor caused by coal seam mining, and the changes in the physical and mechanical properties of the aquifer and impermeable layer. Under complex geological conditions, the real risk of water inrush cannot be accurately assessed based solely on the water inrush coefficient method, which may lead to misjudgment, causing coal mines to face the risk of water inrush without accurate warning during actual mining.

[0004] In order to solve the above defects, a technical solution is now provided. Summary of the invention

[0005] The purpose of the present invention is to provide a coal seam floor water inrush hazard analysis and early warning method to solve the above-mentioned background problems.

[0006] The purpose of the present invention can be achieved by the following technical solution: A method for analyzing and warning the danger of water inrush from a coal seam floor comprises the following steps:

[0007] Step 1: Regional division and stratigraphic analysis: Obtain the coal mining face area of ​​the target mine, and divide the coal mining face area according to a uniformly set division method to obtain various coal mining face areas, and perform profile analysis on the strata corresponding to the various coal mining face areas of the target mine through geological exploration technology, thereby obtaining the stratigraphic sequence corresponding to the various coal mining face areas of the target mine, wherein the stratigraphic sequence includes but is not limited to coal seams, impermeable layers, and aquifers;

[0008] Step 2: Geological structure monitoring and analysis: monitor the geological structure parameters of each coal mining face area of ​​the target mine corresponding to the current monitoring period, and then analyze and obtain the impact assessment index corresponding to the geological structure level;

[0009] Furthermore, the geological structure parameters of each coal mining face area of ​​the target mine corresponding to the current monitoring period are monitored, and the specific execution steps are as follows:

[0010] The rock hardness of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is tested by a hardness tester, and the rock hardness of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained, which is marked as i represents the number of each coal mining face area, i = 1, 2, ...., m, m represents the total number of coal mining face area numbers, j represents the number of each monitoring time point, j = 1, 2, ...., n, n represents the total number of monitoring time point numbers;

[0011] The crack density of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by the crack detector, and the crack density of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained, which is marked as

[0012] The fault development degree of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by geological radar, and the fault development degree of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained, which is marked as

[0013] According to the formula Calculate the geological state compliance index of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period e is a natural constant, YD', MD', and DY' represent the set reference rock hardness, reference crack density, and reference fault development degree, respectively; ΔYD, ΔMD, and ΔDY represent the set allowable rock hardness difference, allowable crack density difference, and allowable fault development degree difference, respectively; a1, a2, and a3 represent the set weight factors, respectively;

[0014] The average geological state compliance index of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is calculated to obtain the average geological state compliance index of each coal mining working face area of ​​the target mine corresponding to the current monitoring period, which is marked as η i At the same time, the average geological state compliance index of each coal mining working face area of ​​the target mine corresponding to the current monitoring period is calculated by difference with the set average geological state compliance index to obtain the geological state compliance index difference of each coal mining working face area of ​​the target mine corresponding to the current monitoring period, and the maximum geological state compliance index difference is extracted from the geological state compliance index difference of each coal mining working face area of ​​the target mine corresponding to the current monitoring period, which is marked as

[0015] According to the formula Calculate the geological stability γ, η', η of the coal mining face area corresponding to the current monitoring period max 'represent the reference average geological state compliance index and the reference maximum geological state compliance index difference respectively, and a4 and a5 represent the set weight factors respectively;

[0016] The geological state compliance index of the first monitoring time point and the geological state compliance index of the last monitoring time point are extracted from the geological state compliance index of each monitoring time point in the current monitoring period of each coal mining face area, and marked as At the same time, the monitoring interval lengths corresponding to the first monitoring time point and the last monitoring time point are extracted and marked as ΔT1;

[0017] According to the formula Calculate the geological change rate κ corresponding to each coal mining face area i ;

[0018] According to the formula Calculate the impact assessment index ω corresponding to the geological structure level 地 , γ' and κ' represent the set reference geological average stability and reference geological average change rate respectively, and a6 and a7 represent the set weight factors respectively.

[0019] Step 3: Water layer impact monitoring and analysis: monitor the water layer parameters of each coal mining face area of ​​the target mine corresponding to the current monitoring period, and then analyze and obtain the impact assessment index corresponding to the water layer level;

[0020] Furthermore, the water layer parameters of each coal mining face area of ​​the target mine corresponding to the current monitoring period are monitored, and the specific execution steps are as follows:

[0021] The water pressure monitoring instrument is used to detect the water pressure of the aquifer in each coal mining working face area of ​​the target mine at each monitoring time point in the current monitoring period, and the water pressure of the aquifer in each coal mining working face area of ​​the target mine at each monitoring time point in the current monitoring period is obtained, which is marked as

[0022] The thickness of the waterproof layer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by drilling method, and the thickness of the waterproof layer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained, which is marked as

[0023] According to the formula Calculate the water inrush coefficient of each coal mining face area in the target mine corresponding to each monitoring time point in the current monitoring period

[0024] From the water inrush coefficients of each monitoring time point in the current monitoring period corresponding to each coal mining working face area of ​​the target mine, extract the water inrush coefficient of the first monitoring time point and mark it as According to the formula Calculate the water inrush coefficient variation σ of each coal mining face area in the target mine corresponding to the current monitoring period i , T' represents the set reference water inrush coefficient, represents the water inrush coefficient of the i-th coal mining face area of ​​the target mine corresponding to the j-1-th monitoring time point in the current monitoring period, b1, b2, b3 represent the set weight factors respectively;

[0025] The unit water inflow and water conductivity of the aquifer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period were detected through a steady flow pumping test, and the unit water inflow and water conductivity of the aquifer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period were obtained, which are marked as

[0026] According to the formula Calculate the water-richness index α of the aquifer in each coal mining face area of ​​the target mine corresponding to the current monitoring period i , q' represents the unit yield of the reference aquifer, It is represented by the unit water inflow of the aquifer at the j-1th monitoring time point in the current monitoring period corresponding to the i-th coal mining face area of ​​the target mine, and b4 and b5 are respectively represented by the set influencing factors;

[0027] According to the formula Calculate the water conductivity index β of the aquifer in each coal mining face area of ​​the target mine corresponding to the current monitoring period i , DX' represents the reference aquifer conductivity, It is represented as the water conductivity of the aquifer at the j-1th monitoring time point in the current monitoring period in the i-th coal mining face area of ​​the target mine, and b6 and b7 are respectively represented as the set influencing factors;

[0028] According to the formula Calculate the impact assessment index ω corresponding to the water layer level 水 , σ', α', β' represent the set reference water inrush coefficient variation, reference aquifer water richness index and reference aquifer conductivity index, respectively; b8, b9, b10 represent the set weight factors, respectively.

[0029] Step 4: Coal seam mining monitoring and analysis: monitor the coal seam mining parameters of each coal mining working face area of ​​the target mine corresponding to the current monitoring period, and then analyze and obtain the impact assessment index corresponding to the coal seam mining level;

[0030] Furthermore, the coal seam mining parameters corresponding to the current monitoring period in each coal mining working face area of ​​the target mine are monitored, and the specific execution steps are as follows:

[0031] The mining speed of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained from the working record of the coal mining machine, and the maximum mining speed and the minimum mining speed are extracted from them, which are recorded as V max 、V min , and extract the monitoring time points corresponding to the maximum mining speed and the minimum mining speed at the same time, and then obtain the monitoring interval length corresponding to the maximum mining speed and the minimum mining speed, recorded as ΔT2, according to the formula Calculate the mining speed change rate μ of each coal mining face area of ​​the target mine corresponding to the current monitoring period i ;

[0032] The maximum depth of crack development in each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by a borehole peep instrument to obtain the maximum depth of crack development in each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period as the mining damage depth of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period. The mining damage depths of each coal mining face area in the mining damage depths of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period are arranged in order from large to small to obtain the mining damage depth sequence of the target mine corresponding to each monitoring time point in the current monitoring period, and the maximum mining damage depth and the minimum mining damage depth are extracted from them, and the average mining damage depth is calculated, thereby obtaining the values ​​of the maximum mining damage depth, the minimum mining damage depth and the average mining damage depth of the target mine corresponding to each monitoring time point in the current monitoring period, and marking them as According to the formula Calculate the mining damage degree ψ of the target mine at each monitoring time point in the current monitoring period j , h0 represents the set reference mining failure depth, c1, c2, c3 represent the set influencing factors;

[0033] The mining stress of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by the stress sensor, and the mining stress of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained. The mining stress of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is compared with the set reference mining stress. When the mining stress at a certain monitoring time point is less than the set reference mining stress, the monitoring time point is marked as a normal monitoring time point, otherwise, the monitoring time point is marked as an abnormal monitoring time point. Thus, the number of normal monitoring time points and the number of abnormal monitoring time points of each coal mining face area of ​​the target mine corresponding to the current monitoring period are statistically obtained, which are marked as ZC respectively. i , YC i , according to the formula Calculate the mining stress anomaly index of each coal mining face area of ​​the target mine corresponding to the current monitoring period c4 and c5 represent the set impact factors respectively;

[0034] According to the formula Calculate the impact assessment index ω corresponding to the coal seam mining level 采 , c6, c7, and c8 represent the set weight factors respectively.

[0035] Step 5. Water inrush hazard assessment of coal seam floor: Analyze the water inrush hazard assessment coefficient of the coal seam floor corresponding to the target mine based on the impact assessment index corresponding to the geological structure level, the impact assessment index corresponding to the water layer level and the impact assessment index corresponding to the coal seam mining level, and then analyze and obtain the water inrush hazard assessment coefficient of the coal seam floor corresponding to the target mine;

[0036] Furthermore, based on the impact assessment index corresponding to the geological structure level, the impact assessment index corresponding to the water layer level and the impact assessment index corresponding to the coal seam mining level, the water inrush hazard assessment coefficient of the coal seam floor corresponding to the target mine is analyzed. The specific analysis method is as follows:

[0037] According to the formula Calculate the water inrush hazard assessment coefficient of the corresponding coal seam floor of the target mine d1, d2, and d3 represent the weight factors corresponding to the impact assessment index corresponding to the set geological structure level, the impact assessment index corresponding to the water layer level, and the impact assessment index corresponding to the coal seam mining level, respectively;

[0038] The water inrush hazard assessment coefficient of the coal seam floor corresponding to the target mine is matched with the water inrush hazard assessment coefficient thresholds corresponding to each set water inrush hazard level to obtain the water inrush hazard level of the coal seam floor corresponding to the target mine.

[0039] Step 6. Water inrush hazard level warning display: Provide corresponding water inrush hazard warning based on the water inrush hazard level of the corresponding coal seam floor of the target mine.

[0040] Beneficial effects of the present invention:

[0041] The present invention conducts an in-depth analysis of the impact of the geological structure level according to the geological stability and geological change rate, calculates the impact assessment index corresponding to the geological structure level, realizes the multi-dimensional analysis of the impact of the geological structure level, and further provides a more reliable data support basis for the subsequent coal dust floor water inrush hazard assessment.

[0042] The present invention analyzes the influence of the water layer aspect according to the variation degree of the water inrush coefficient, the water-richness index of the aquifer and the water conductivity index of the aquifer, and calculates the impact assessment index corresponding to the water layer aspect, which accurately reflects the influence of the water layer on the danger of water inrush from the coal seam floor to a certain extent, and avoids the error of the analysis result caused by a single factor evaluation.

[0043] The present invention analyzes the impact of coal seam mining levels according to the mining speed change rate, mining damage degree and mining stress anomaly index, and calculates the impact assessment index corresponding to the coal seam mining level. To a certain extent, it effectively grasps the impact of coal seam mining on the hazard of water inrush from the coal seam floor, and ensures the comprehensiveness and accuracy of the analysis of the hazard of water inrush from the coal seam floor in the coal seam mining link.

[0044] The present invention conducts a comprehensive analysis of the impact assessment index corresponding to the geological structure level of the target mine, the impact assessment index corresponding to the water layer level, and the impact assessment index corresponding to the coal seam mining level, to obtain the water inrush hazard level of the coal seam floor corresponding to the target mine, and to make corresponding early warnings. On the one hand, it makes up for the shortcomings of the coal seam floor water inrush early warning analysis results in the current technology, making the water inrush hazard analysis results more accurate, comprehensive and reliable. On the other hand, it greatly improves the timeliness and real-time awareness of mine managers on the danger of water inrush in the coal seam floor, while reducing the incidence of mine safety accidents to the greatest extent, providing reliable protection for the continuity of coal mine production and personnel safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] Figure 1 It is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] See also Figure 1 As shown, the present invention is a method for analyzing and warning the danger of water inrush from coal seam floors, comprising the following steps:

[0049] Step 1: Regional division and stratigraphic analysis: Obtain the coal mining face area of ​​the target mine, and divide the coal mining face area according to a uniformly set division method to obtain various coal mining face areas, and perform profile analysis on the strata corresponding to the various coal mining face areas of the target mine through geological exploration technology, thereby obtaining the stratigraphic sequence corresponding to the various coal mining face areas of the target mine, wherein the stratigraphic sequence includes but is not limited to coal seams, impermeable layers, and aquifers;

[0050] Step 2: Geological structure monitoring and analysis: Monitor the geological structure parameters of each coal mining face area of ​​the target mine corresponding to the current monitoring period, and then analyze and obtain the impact assessment index corresponding to the geological structure level. The specific implementation steps are as follows:

[0051] The rock hardness of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is tested by a hardness tester, and the rock hardness of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained, which is marked as i represents the number of each coal mining face area, i = 1, 2, ...., m, m represents the total number of coal mining face area numbers, j represents the number of each monitoring time point, j = 1, 2, ...., n, n represents the total number of monitoring time point numbers;

[0052] The crack density of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by the crack detector, and the crack density of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained, which is marked as

[0053] The fault development degree of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by geological radar, and the fault development degree of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained, which is marked as

[0054] According to the formula Calculate the geological state compliance index of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period e is a natural constant, YD', MD', and DY' represent the set reference rock hardness, reference crack density, and reference fault development degree, respectively; ΔYD, ΔMD, and ΔDY represent the set allowable rock hardness difference, allowable crack density difference, and allowable fault development degree difference, respectively; a1, a2, and a3 represent the set weight factors, respectively;

[0055] The average geological state compliance index of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is calculated to obtain the average geological state compliance index of each coal mining working face area of ​​the target mine corresponding to the current monitoring period, which is marked as η i At the same time, the average geological state compliance index of each coal mining working face area of ​​the target mine corresponding to the current monitoring period is calculated by difference with the set average geological state compliance index to obtain the geological state compliance index difference of each coal mining working face area of ​​the target mine corresponding to the current monitoring period, and the maximum geological state compliance index difference is extracted from the geological state compliance index difference of each coal mining working face area of ​​the target mine corresponding to the current monitoring period, which is marked as

[0056] According to the formula Calculate the geological stability γ, η', η of the coal mining face area corresponding to the current monitoring period max 'represent the reference average geological state compliance index and the reference maximum geological state compliance index difference respectively, and a4 and a5 represent the set weight factors respectively;

[0057] The geological state compliance index of the first monitoring time point and the geological state compliance index of the last monitoring time point are extracted from the geological state compliance index of each monitoring time point in the current monitoring period of each coal mining face area, and marked as At the same time, the monitoring interval lengths corresponding to the first monitoring time point and the last monitoring time point are extracted and marked as ΔT1;

[0058] According to the formula Calculate the geological change rate κ corresponding to each coal mining face area i ;

[0059] According to the formula Calculate the impact assessment index ω corresponding to the geological structure level 地 , γ' and κ' represent the set reference geological average stability and reference geological average change rate respectively, and a6 and a7 represent the set weight factors respectively.

[0060] In a specific embodiment, the present invention performs an in-depth analysis of the impact of the geological structure level based on the geological stability and geological change rate, calculates the impact assessment index corresponding to the geological structure level, and realizes a multi-dimensional analysis of the impact of the geological structure level, thereby providing a more reliable data support basis for the subsequent coal dust floor water inrush hazard assessment.

[0061] Step 3: Water layer impact monitoring and analysis: Monitor the water layer parameters of each coal mining face area of ​​the target mine corresponding to the current monitoring period, and then analyze and obtain the impact assessment index corresponding to the water layer level. The specific implementation steps are as follows:

[0062] The water pressure monitoring instrument is used to detect the water pressure of the aquifer in each coal mining working face area of ​​the target mine at each monitoring time point in the current monitoring period, and the water pressure of the aquifer in each coal mining working face area of ​​the target mine at each monitoring time point in the current monitoring period is obtained, which is marked as

[0063] The thickness of the waterproof layer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by drilling method, and the thickness of the waterproof layer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained, which is marked as

[0064] It should be noted that the drilling method is to drill holes underground using drilling equipment, take out the cores, and directly measure the thickness of the water-repellent layer in the cores.

[0065] According to the formula Calculate the water inrush coefficient of each coal mining face area in the target mine corresponding to each monitoring time point in the current monitoring period

[0066] From the water inrush coefficients of each monitoring time point in the current monitoring period corresponding to each coal mining working face area of ​​the target mine, extract the water inrush coefficient of the first monitoring time point and mark it as According to the formula Calculate the water inrush coefficient variation σ of each coal mining face area in the target mine corresponding to the current monitoring period i , T' represents the set reference water inrush coefficient, represents the water inrush coefficient of the i-th coal mining face area of ​​the target mine corresponding to the j-1-th monitoring time point in the current monitoring period, b1, b2, b3 represent the set weight factors respectively;

[0067] The unit water inflow and water conductivity of the aquifer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period were detected through a steady flow pumping test, and the unit water inflow and water conductivity of the aquifer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period were obtained, which are marked as

[0068] It should be noted that the steady flow pumping test is to pump water at a steady flow rate in the pumping hole to lower the water level around the pumping hole to form a stable drop funnel. By measuring the pumping flow rate, water level drop and other data, the unit water yield and water conductivity of the aquifer are calculated using the Qiubuyi formula.

[0069] According to the formula Calculate the water-richness index α of the aquifer in each coal mining face area of ​​the target mine corresponding to the current monitoring period i , q' represents the unit yield of the reference aquifer, It is represented by the unit water inflow of the aquifer at the j-1th monitoring time point in the current monitoring period corresponding to the i-th coal mining face area of ​​the target mine, and b4 and b5 are respectively represented by the set influencing factors;

[0070] According to the formula Calculate the water conductivity index β of the aquifer in each coal mining face area of ​​the target mine corresponding to the current monitoring period i , DX' represents the reference aquifer conductivity, It is represented as the water conductivity of the aquifer at the j-1th monitoring time point in the current monitoring period in the i-th coal mining face area of ​​the target mine, and b6 and b7 are respectively represented as the set influencing factors;

[0071] According to the formula The impact assessment index corresponding to the water layer level is calculated, σ', α', β' represent the set reference water inrush coefficient change, reference aquifer water richness index and reference aquifer conductivity index, respectively, b8, b9, b10 represent the set weight factors, respectively.

[0072] In a specific embodiment, the present invention analyzes the influence of the water layer level according to the variation degree of the water inrush coefficient, the water-richness index of the aquifer and the water conductivity index of the aquifer, and calculates the impact assessment index corresponding to the water layer level, which accurately reflects the influence of the water layer on the danger of water inrush from the coal seam floor to a certain extent, and avoids the error of the analysis result caused by a single factor evaluation.

[0073] Step 4: Coal seam mining monitoring and analysis: monitor the coal seam mining parameters of each coal mining face area of ​​the target mine corresponding to the current monitoring period, and then analyze and obtain the impact assessment index corresponding to the coal seam mining level. The specific implementation steps are as follows:

[0074] The mining speed of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained from the working record of the coal mining machine, and the maximum mining speed and the minimum mining speed are extracted from them, which are recorded as V max 、V min, and extract the monitoring time points corresponding to the maximum mining speed and the minimum mining speed at the same time, and then obtain the monitoring interval length corresponding to the maximum mining speed and the minimum mining speed, recorded as ΔT2, according to the formula Calculate the mining speed change rate μ of each coal mining face area of ​​the target mine corresponding to the current monitoring period i ;

[0075] The maximum depth of crack development in each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by a borehole peep instrument to obtain the maximum depth of crack development in each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period as the mining damage depth of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period. The mining damage depths of each coal mining face area in the mining damage depths of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period are arranged in order from large to small to obtain the mining damage depth sequence of the target mine corresponding to each monitoring time point in the current monitoring period, and the maximum mining damage depth and the minimum mining damage depth are extracted from them, and the average mining damage depth is calculated, thereby obtaining the values ​​of the maximum mining damage depth, the minimum mining damage depth and the average mining damage depth of the target mine corresponding to each monitoring time point in the current monitoring period, and marking them as According to the formula Calculate the mining damage degree ψ of the target mine at each monitoring time point in the current monitoring period j , h0 represents the set reference mining failure depth, c1, c2, c3 represent the set influencing factors;

[0076] The mining stress of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by the stress sensor, and the mining stress of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained. The mining stress of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is compared with the set reference mining stress. When the mining stress at a certain monitoring time point is less than the set reference mining stress, the monitoring time point is marked as a normal monitoring time point, otherwise, the monitoring time point is marked as an abnormal monitoring time point. Thus, the number of normal monitoring time points and the number of abnormal monitoring time points of each coal mining face area of ​​the target mine corresponding to the current monitoring period are statistically obtained, which are marked as ZC respectively. i , YC i , according to the formula Calculate the mining stress anomaly index of each coal mining face area of ​​the target mine corresponding to the current monitoring period c4 and c5 represent the set impact factors respectively;

[0077] According to the formula Calculate the impact assessment index ω corresponding to the coal seam mining level 采 , c6, c7, and c8 represent the set weight factors respectively.

[0078] In a specific embodiment, the present invention analyzes the impact of coal seam mining levels based on the mining speed change rate, mining damage degree and mining stress anomaly index, and calculates the impact assessment index corresponding to the coal seam mining level. To a certain extent, it effectively grasps the impact of coal seam mining on the risk of water inrush from the coal seam floor, and ensures the comprehensiveness and accuracy of the analysis of the risk of water inrush from the coal seam floor in the coal seam mining link.

[0079] Step 5. Assessment of water inrush hazard of coal seam floor: Based on the impact assessment index corresponding to the geological structure level, the impact assessment index corresponding to the water layer level and the impact assessment index corresponding to the coal seam mining level, the water inrush hazard assessment coefficient of the target mine corresponding to the coal seam floor is analyzed, and then the water inrush hazard assessment coefficient of the target mine corresponding to the coal seam floor is obtained by analysis. The specific analysis method is as follows:

[0080] According to the formula Calculate the water inrush hazard assessment coefficient of the corresponding coal seam floor of the target mine d1, d2, and d3 represent the weight factors corresponding to the impact assessment index corresponding to the set geological structure level, the impact assessment index corresponding to the water layer level, and the impact assessment index corresponding to the coal seam mining level, respectively;

[0081] The water inrush hazard assessment coefficient of the coal seam floor corresponding to the target mine is matched with the water inrush hazard assessment coefficient thresholds corresponding to each set water inrush hazard level to obtain the water inrush hazard level of the coal seam floor corresponding to the target mine.

[0082] In a specific embodiment, the present invention conducts a comprehensive analysis of the impact assessment index corresponding to the geological structure level of the target mine, the impact assessment index corresponding to the water layer level, and the impact assessment index corresponding to the coal seam mining level, to obtain the water inrush hazard level of the coal seam floor corresponding to the target mine, and to make corresponding warnings. On the one hand, it makes up for the shortcomings of the coal seam floor water inrush warning analysis results in the current technology, making the water inrush hazard analysis results more accurate, comprehensive and reliable. On the other hand, it greatly improves the timeliness and real-time awareness of mine managers of the danger of water inrush in the coal seam floor, while reducing the incidence of mine safety accidents to the greatest extent, providing reliable protection for the continuity of coal mine production and personnel safety.

[0083] Step 6. Water inrush hazard level warning display: Provide corresponding water inrush hazard warning based on the water inrush hazard level of the corresponding coal seam floor of the target mine.

[0084] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for analyzing and warning the danger of water inrush from coal seam floors, characterized in that: The following steps are involved: Step 1: Regional division and stratigraphic analysis: Obtain the coal mining face area of ​​the target mine, and divide the coal mining face area according to a uniformly set division method to obtain various coal mining face areas, and perform profile analysis on the strata corresponding to the various coal mining face areas of the target mine through geological exploration technology, thereby obtaining the stratigraphic sequence corresponding to the various coal mining face areas of the target mine, wherein the stratigraphic sequence includes but is not limited to coal seams, impermeable layers, and aquifers; Step 2: Geological structure monitoring and analysis: monitor the geological structure parameters of each coal mining face area of ​​the target mine corresponding to the current monitoring period, and then analyze and obtain the impact assessment index corresponding to the geological structure level; Step 3: Water layer impact monitoring and analysis: monitor the water layer parameters of each coal mining face area of ​​the target mine corresponding to the current monitoring period, and then analyze and obtain the impact assessment index corresponding to the water layer level; Step 4: Coal seam mining monitoring and analysis: monitor the coal seam mining parameters of each coal mining working face area of ​​the target mine corresponding to the current monitoring period, and then analyze and obtain the impact assessment index corresponding to the coal seam mining level; Step 5. Water inrush hazard assessment of coal seam floor: Analyze the water inrush hazard assessment coefficient of the coal seam floor corresponding to the target mine based on the impact assessment index corresponding to the geological structure level, the impact assessment index corresponding to the water layer level and the impact assessment index corresponding to the coal seam mining level, and then analyze and obtain the water inrush hazard assessment coefficient of the coal seam floor corresponding to the target mine; Step 6. Water inrush hazard level warning display: Provide corresponding water inrush hazard warning based on the water inrush hazard level of the corresponding coal seam floor of the target mine.

2. A method for analyzing and warning the danger of water inrush from coal seam floors according to claim 1, characterized in that: The monitoring of the geological structure parameters of each coal mining face area of ​​the target mine corresponding to the current monitoring period is specifically performed in the following steps: The rock hardness of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is tested by a hardness tester, and the rock hardness of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained, which is marked as i represents the number of each coal mining face area, i = 1, 2, ...., m, m represents the total number of coal mining face area numbers, j represents the number of each monitoring time point, j = 1, 2, ...., n, n represents the total number of monitoring time point numbers; The crack density of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by the crack detector, and the crack density of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained, which is marked as The fault development degree of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by geological radar, and the fault development degree of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained, which is marked as According to the formula Calculate the geological state compliance index of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period e is represented by a natural constant, YD', MD', and DY' represent the set reference rock hardness, reference crack density, and reference fault development degree, respectively, ΔYD, ΔMD, and ΔDY represent the set allowable rock hardness difference, allowable crack density difference, and allowable fault development degree difference, respectively, and a1, a2, and a3 represent the set weight factors, respectively.

3. The method for analyzing and warning the danger of water inrush from coal seam floors according to claim 1 is characterized in that: The average geological state compliance index of each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is calculated to obtain the average geological state compliance index of each coal mining working face area of ​​the target mine corresponding to the current monitoring period, which is marked as η i At the same time, the average geological state compliance index of each coal mining working face area of ​​the target mine corresponding to the current monitoring period is calculated by difference with the set average geological state compliance index to obtain the geological state compliance index difference of each coal mining working face area of ​​the target mine corresponding to the current monitoring period, and the maximum geological state compliance index difference is extracted from the geological state compliance index difference of each coal mining working face area of ​​the target mine corresponding to the current monitoring period, which is marked as According to the formula Calculate the geological stability γ, η', η of the coal mining face area corresponding to the current monitoring period max 'represent the set reference average geological state compliance index and reference maximum geological state compliance index difference respectively, a4 and a5 represent the set weight factors respectively.

4. A method for analyzing and warning the danger of water inrush from coal seam floors according to claim 1, characterized in that: The geological state compliance index of the first monitoring time point and the geological state compliance index of the last monitoring time point are extracted from the geological state compliance index of each monitoring time point in the current monitoring period of each coal mining face area, and the monitoring interval length corresponding to the first monitoring time point and the last monitoring time point are extracted at the same time. The geological change rate κ corresponding to each coal mining face area is obtained through comprehensive analysis. i ; According to the formula Calculate the impact assessment index ω corresponding to the geological structure level 地 , γ′ and κ′ represent the set reference geological average stability and reference geological average change rate respectively, and a6 and a7 represent the set weight factors respectively.

5. The method for analyzing and warning the danger of water inrush from coal seam floors according to claim 1 is characterized in that: The specific steps of monitoring the water layer parameters corresponding to the current monitoring period in each coal mining working face area of ​​the target mine are as follows: The water pressure of the aquifer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by a water pressure monitoring instrument to obtain the water pressure of the aquifer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period; The thickness of the waterproof layer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by drilling method, and the thickness of the waterproof layer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained; Through comprehensive analysis, the water inrush coefficient of each coal mining face area in the target mine corresponding to each monitoring time point in the current monitoring period is obtained Extract the water inrush coefficient at the first monitoring time point from the water inrush coefficients at each monitoring time point in the current monitoring period in each coal mining working face area of ​​the target mine, and mark it as T1 i , according to the formula Calculate the water inrush coefficient variation σ of each coal mining face area in the target mine corresponding to the current monitoring period i , T' is represented as the set reference water inrush coefficient, is represented as the water inrush coefficient of the i-th coal mining face area of ​​the target mine corresponding to the j-1-th monitoring time point in the current monitoring period, and b1, b2, and b3 are represented as the set weight factors respectively.

6. The method for analyzing and warning the danger of water inrush from coal seam floors according to claim 1 is characterized in that: The unit water inflow and water conductivity of the aquifer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period were detected through a steady flow pumping test, and the unit water inflow and water conductivity of the aquifer in each coal mining working face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period were obtained, which are marked as According to the formula Calculate the water-richness index α of the aquifer in each coal mining face area of ​​the target mine corresponding to the current monitoring period i , q' represents the unit yield of the reference aquifer, It is represented as the unit water inflow of the aquifer at the j-1th monitoring time point in the current monitoring period in the i-th coal mining face area of ​​the target mine, and b4 and b5 are respectively represented as the set influencing factors; According to the formula Calculate the water conductivity index β of the aquifer in each coal mining face area of ​​the target mine corresponding to the current monitoring period i , DX' represents the reference aquifer conductivity, It is represented as the water conductivity of the aquifer in the i-th coal mining face area of ​​the target mine corresponding to the j-1-th monitoring time point in the current monitoring period, and b6 and b7 are respectively represented as the set influencing factors.

7. The method for analyzing and warning the danger of water inrush from coal seam floors according to claim 1 is characterized in that: According to the formula Calculate the impact assessment index ω corresponding to the water layer level 水 , σ', α', β' represent the set reference water inrush coefficient variation, reference aquifer water richness index and reference aquifer conductivity index, respectively; b8, b9, b10 represent the set weight factors, respectively.

8. The method for analyzing and warning the danger of water inrush from coal seam floors according to claim 1 is characterized in that: The coal seam mining parameters corresponding to the current monitoring period in each coal mining working face area of ​​the target mine are monitored, and the specific execution steps are as follows: The mining speed of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained from the working record of the coal mining machine, and the maximum mining speed and the minimum mining speed are extracted from them. At the same time, the monitoring time points corresponding to the maximum mining speed and the minimum mining speed are extracted, and then the monitoring interval duration corresponding to the maximum mining speed and the minimum mining speed is obtained. Through comprehensive analysis, the mining speed change rate μ of each coal mining face area of ​​the target mine corresponding to the current monitoring period is obtained i ; The maximum depth of crack development in each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by a borehole peep instrument to obtain the maximum depth of crack development in each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period as the mining damage depth of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period. The mining damage depths of each coal mining face area in the mining damage depths of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period are arranged in order from large to small to obtain the mining damage depth sequence of the target mine corresponding to each monitoring time point in the current monitoring period, and the maximum mining damage depth and the minimum mining damage depth are extracted from them, and the average mining damage depth is calculated, thereby obtaining the values ​​of the maximum mining damage depth, the minimum mining damage depth and the average mining damage depth of the target mine corresponding to each monitoring time point in the current monitoring period, and marking them as According to the formula Calculate the mining damage degree ψ of the target mine at each monitoring time point in the current monitoring period j , h0 represents the set reference mining failure depth, c1, c2, c3 represent the set influencing factors.

9. The method for analyzing and warning the danger of water inrush from coal seam floors according to claim 1, characterized in that: The mining stress of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is detected by the stress sensor, and the mining stress of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is obtained. The mining stress of each coal mining face area of ​​the target mine corresponding to each monitoring time point in the current monitoring period is compared with the set reference mining stress. When the mining stress at a certain monitoring time point is less than the set reference mining stress, the monitoring time point is marked as a normal monitoring time point, otherwise, the monitoring time point is marked as an abnormal monitoring time point. Thus, the number of normal monitoring time points and the number of abnormal monitoring time points of each coal mining face area of ​​the target mine corresponding to the current monitoring period are statistically obtained, which are marked as ZC respectively. i , YC i , according to the formula Calculate the mining stress anomaly index θ of each coal mining face area of ​​the target mine corresponding to the current monitoring period i , c4 and c5 represent the set impact factors respectively; According to the formula Calculate the impact assessment index ω corresponding to the coal seam mining level 采 , c6, c7, and c8 represent the set weight factors respectively.

10. The method for analyzing and warning the danger of water inrush from coal seam floors according to claim 1, characterized in that: The water inrush hazard assessment coefficient of the coal seam floor corresponding to the target mine is analyzed based on the impact assessment index corresponding to the geological structure level, the impact assessment index corresponding to the water layer level and the impact assessment index corresponding to the coal seam mining level. The specific analysis method is as follows: According to the formula Calculate the water inrush hazard assessment coefficient of the corresponding coal seam floor of the target mine d1, d2, and d3 represent the weight factors corresponding to the impact assessment index corresponding to the set geological structure level, the impact assessment index corresponding to the water layer level, and the impact assessment index corresponding to the coal seam mining level, respectively; The water inrush hazard assessment coefficient of the coal seam floor corresponding to the target mine is matched with the water inrush hazard assessment coefficient thresholds corresponding to each set water inrush hazard level to obtain the water inrush hazard level of the coal seam floor corresponding to the target mine.

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