Method for correcting elevation error of micro-seismic positioning system based on top plate deep hole blasting vibration

Abstract

A method for correcting an elevation error of a micro-seismic positioning system based on roof deep hole blasting vibration comprises the following steps: determining an underground coal and rock mass deep position of pre-construction roof deep hole blasting, confirming construction parameters of actual roof deep hole blasting, confirming actual elevation of blasting excitation vibration, and obtaining theoretical elevation of a micro-seismic system for calculating a blasting event; and calculating a deviation value between the actual blasting seismic source elevation and the theoretically calculated seismic source elevation, when the theoretical elevation is not within the actual seismic source elevation range, judging that the elevation positioning of the micro-seismic monitoring system has an error, correcting the elevation positioning error of the micro-seismic monitoring system, eliminating an accidental error, and obtaining an elevation positioning correction parameter of the micro-seismic monitoring system. According to the method, the error of the micro-seismic monitoring system on the spatial position is corrected, particularly the error is corrected for the elevation of a micro-seismic high-energy event, the high-energy disaster-causing occurrence horizon is accurately obtained, the judgment of the actual occurrence horizon of the high-energy event is realized, and the safe mining of a coal mine is ensured.

Description

Technical Field

[0001] The invention relates to a method for correcting the elevation error of a microseismic positioning system based on roof deep hole blasting vibration, and belongs to the technical field of safe mining of coal mines. Background Art

[0002] Rock burst refers to the dynamic phenomenon of sudden destruction of rock mass around shafts, tunnels or working faces due to the instantaneous release of elastic deformation energy. Its huge destructiveness poses a great threat to safe underground mining. Therefore, it is necessary to monitor and warn of the danger of rock burst and take preventive measures to ensure safe and efficient production in coal mines.

[0003] At present, all rock burst mines use microseismic monitoring technology to monitor rock burst in coal mines. It mainly monitors the underground coal-rock fracture by arranging a microseismic station network within the coal mine, and conducts comprehensive monitoring and early warning of rock burst in mines by analyzing the aperture position, energy, and occurrence frequency of coal-rock fracture events recorded by the network monitoring. Since most of the stations in the microseismic monitoring system are arranged in coal seam tunnels, although they are arranged in a plane according to the principle of dense inside and sparse outside, it is difficult to form an effective envelope in space. Therefore, the microseismic monitoring system has high plane positioning accuracy and large positioning error in the spatial dimension, which makes it impossible to accurately determine the specific layer where the high-energy disaster-causing mine earthquake event occurs, and it is impossible to take targeted prevention and control measures, and underground safety production cannot be guaranteed. Summary of the invention

[0004] The present invention provides a method for correcting the elevation error of a microseismic positioning system based on roof deep hole blasting vibration. The method can correct the elevation positioning error of the microseismic positioning system, accurately obtain the high-energy disaster-causing layer, and ensure safe mining of coal mines.

[0005] In order to achieve the above object, the present invention provides a method for correcting the elevation error of a microseismic positioning system based on roof deep hole blasting vibration, comprising the following steps:

[0006] (1) Determine the deep position of coal and rock mass in the underground mine for pre-construction roof deep hole blasting;

[0007] (2) Confirm the actual construction parameters of the roof deep hole blasting, including the hole location, actual hole depth and actual charging section length;

[0008] (3) Confirm the actual elevation of the blasting-induced vibration;

[0009] (4) Use the microseismic monitoring system to collect and record the vibration wave waveform signal generated by the blasting, and solve the source location parameters to obtain the theoretical elevation of the blasting event calculated by the microseismic system;

[0010] (5) Calculate the deviation between the actual earthquake source elevation and the theoretically calculated earthquake source elevation; when the theoretical elevation is not within the actual earthquake source elevation range, it is determined that there is an error in the elevation positioning of the microseismic monitoring system, and the elevation positioning error of the microseismic monitoring system is corrected;

[0011] (6) Repeat steps (1) to (4) in multiple groups to eliminate accidental errors and determine the deviation between the actual earthquake source elevation position and the theoretically calculated elevation position. Then, perform error determination and correction of the elevation positioning of the microseismic monitoring system in step (5) to obtain correction parameters for the elevation positioning of the microseismic monitoring system.

[0012] Furthermore, in step (2), the hole opening position is at the tunnel roof; the actual hole depth is L, and the actual charging section length Ly is 1 / 3 of the actual hole depth, that is, Ly=L / 3.

[0013] Furthermore, in step (3), the actual elevation of the blasting excitation vibration is regarded as the actual charging section length Ly, wherein the lower end elevation and the upper end elevation of the actual charging section length Ly are H s , H x , H s , H x The determination process is:

[0014] ① Determine the elevation h of the deep hole blasting opening position of the construction roof according to the guide wire point;

[0015] ② Determine H s , H x They are: H s =h+Lsinα,H x =h+(Ll y )sinα;

[0016] Among them, α is the inclination angle of the blasting pressure relief hole.

[0017] Furthermore, in step (4), the source location parameter (X 0 , Y 0 , Z 0 , t 0 ) is calculated as follows:

[0018]

[0019] Where, t i The stations deployed for the microseismic monitoring system monitor the initial movement of the seismic wave and are manually calibrated in the system; (X i , Y i , Z i ) are the coordinates of different stations; (X 0 , Y 0 , Z 0 ) is the spatial coordinate of the earthquake source; t0 is the time when the earthquake source occurs; V is the velocity of longitudinal wave propagation, 3700m / s;

[0020] By solving the source location parameter formula, the theoretical elevation of the blasting event is obtained, that is, the theoretically calculated source elevation Z 0 .

[0021] Furthermore, in step (5), the actual blasting source elevation, i.e., the lower end elevation and the upper end elevation H of the actual charge section length Ly are s , H x Compared with the theoretically calculated earthquake source height Z 0 There are two cases of deviation value ΔZ between:

[0022] ①①H x ≤Z 0 ≤H s ;

[0023] That is, if the theoretically calculated earthquake source elevation is within the actual charging section elevation range, it is determined that the microseismic monitoring system elevation positioning has no error, that is, ΔZ = 0;

[0024] ②Z 0 >H s or Z 0 <H x ;

[0025] That is, if the theoretically calculated earthquake source elevation is not within the actual charging section elevation range, it is determined that the microseismic monitoring system elevation positioning has an error, and the microseismic monitoring system elevation positioning error correction is required, ΔZ = Z 0 -H, H is H x or H s .

[0026] The present invention determines the deep position of the underground coal rock mass of the pre-constructed roof deep hole blasting, confirms the construction parameters of the actual roof deep hole blasting, confirms the actual elevation of the blasting excitation vibration, obtains the theoretical elevation of the blasting event calculated by the microseismic system, calculates the deviation value between the actual source elevation of the blasting and the theoretically calculated source elevation, and when the theoretical elevation is not within the actual source elevation range, it is determined that there is an error in the elevation positioning of the microseismic monitoring system, and the microseismic monitoring system elevation positioning error is corrected to eliminate accidental errors, and the microseismic monitoring system elevation positioning correction parameters are obtained. The present invention corrects the error of the microseismic monitoring system in the spatial position, especially the error correction for the elevation of the microseismic high-energy event, accurately obtains the high-energy disaster-causing layer, realizes the discrimination of the actual occurrence layer of the high-energy event, and ensures the safe mining of the coal mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a work flow chart of the present invention;

[0028] Figure 2 It is a schematic diagram of the pressure relief blasting parameter calculation and the relative position of the earthquake source of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] like Figure 1 As shown, a method for correcting the elevation error of a microseismic positioning system based on roof deep hole blasting vibration includes the following steps:

[0031] (1) Determine the deep position of coal and rock mass in the underground mine for pre-construction roof deep hole blasting;

[0032] (2) Confirm the actual construction parameters of the roof deep hole blasting, including the hole location, actual hole depth and actual charging section length;

[0033] (3) Confirm the actual elevation of the blasting-induced vibration;

[0034] (4) Use the microseismic monitoring system to collect and record the vibration wave waveform signal generated by the blasting, and solve the source location parameters to obtain the theoretical elevation of the blasting event calculated by the microseismic system;

[0035] (5) Calculate the deviation between the actual earthquake source elevation and the theoretically calculated earthquake source elevation; when the theoretical elevation is not within the actual earthquake source elevation range, it is determined that there is an error in the elevation positioning of the microseismic monitoring system, and the elevation positioning error of the microseismic monitoring system is corrected;

[0036] (6) Repeat steps (1) to (4) in multiple groups to eliminate accidental errors and determine the deviation between the actual earthquake source elevation position and the theoretically calculated elevation position. Then, perform error determination and correction of the elevation positioning of the microseismic monitoring system in step (5) to obtain correction parameters for the elevation positioning of the microseismic monitoring system.

[0037] Embodiment: (1) Taking the 250101-2 working face of a certain mine as an example, the impact risk of the 250101-2 working face is high due to the high stress of the overlying legacy coal pillar. Therefore, deep hole blasting measures are taken at the shoulder angle of the coal wall of the working face to relieve the danger and relieve the pressure;

[0038] (2) Confirm the actual construction parameters of the roof deep hole blasting, the hole opening position is the tunnel roof, the actual hole depth L is 70m, and the charging section length Ly is 20m;

[0039] (3) Confirm the actual elevation of the blasting vibration, and determine the elevation of the deep hole blasting opening position of the construction roof according to the guide wire point h = 1005m, and the actual upper and lower end elevations of the charging section H s , H x , H s =h+Lsinα=1052.96m,Hx =h+(Ll y )sinα=1035.53m, α is the inclination angle of the blasting pressure relief hole, which is 60 degrees; the actual elevation of the actual charging section regarded as the blasting excitation vibration is [1035.53,1052.96];

[0040] (4) Figure 2 As shown in the figure, the microseismic monitoring system is used to collect and record the vibration wave waveform signal generated by the blasting, and the source position parameters are solved to obtain the theoretical elevation of the blasting event calculated by the microseismic system. 0 , Y 0 , Z 0 , t 0 ) Calculation formula:

[0041] V is the velocity of longitudinal wave propagation, 3700m / s;

[0042] Get Z 0 =1015.57m;

[0043] (5) Due to Z 0 =1015.57m <H x =1035.53m, so the deviation value ΔZ = 1015.57-1035.53 = -19.96m, that is, the theoretical calculated elevation of the microseismic monitoring system is 19.96m lower than the actual elevation;

[0044] (6) Repeat steps (1) to (5) to eliminate accidental errors and determine the deviation between the actual earthquake source elevation and the theoretically calculated elevation. The repeated data are shown in Table 1:

[0045] Table 1 Deviation between actual earthquake source elevation and theoretically calculated elevation

[0046]

[0047]

[0048] (7) Based on multiple sets of repeated test data, it was determined that the positioning elevation deviation of the microseismic monitoring system was approximately 18 m, that is, the theoretical positioning elevation of the microseismic monitoring system was approximately 18 m lower than the actual elevation.

Claims

1. A method for correcting the elevation error of a microseismic positioning system based on roof deep hole blasting vibration, characterized in that: The steps include: (1) Determine the deep position of the coal and rock mass in the underground mine for pre-construction roof deep hole blasting; (2) Confirm the actual construction parameters of the roof deep hole blasting, including the hole location, actual hole depth and actual charging section length; (3) Confirm the actual elevation of the blasting-induced vibration; (4) Use the microseismic monitoring system to collect and record the vibration wave waveform signal generated by the blasting, and solve the source location parameters to obtain the theoretical elevation of the blasting event calculated by the microseismic system; (5) Calculate the deviation between the actual earthquake source elevation and the theoretically calculated earthquake source elevation; when the theoretical elevation is not within the actual earthquake source elevation range, it is determined that there is an error in the elevation positioning of the microseismic monitoring system, and the elevation positioning error of the microseismic monitoring system is corrected; (6) Repeat steps (1) to (4) in multiple groups to eliminate accidental errors and determine the deviation between the actual earthquake source elevation position and the theoretically calculated elevation position. Then, perform error determination and correction of the elevation positioning of the microseismic monitoring system in step (5) to obtain correction parameters for the elevation positioning of the microseismic monitoring system.

2. The method for correcting the elevation error of the microseismic positioning system based on the roof deep hole blasting vibration according to claim 1 is characterized in that: In the step (2), the hole is opened at the top of the tunnel; the actual hole depth is L, and the actual charging section length Ly is 1 / 3 of the actual hole depth, that is, Ly=L / 3.

3. The method for correcting the elevation error of the microseismic positioning system based on the roof deep hole blasting vibration according to claim 2 is characterized in that: In step (3), the actual elevation of the blasting excitation vibration is regarded as the actual charging section length Ly, wherein the lower end elevation and the upper end elevation of the actual charging section length Ly are H s , H x , H s , H x The determination process is: ① Determine the elevation h of the deep hole blasting opening position of the construction roof according to the guide wire point; ② Determine H s , H x They are: H s =h+Lsinα,H x =h+(Ll y )sinα; Among them, α is the inclination angle of the blasting pressure relief hole.

4. The method for correcting the elevation error of the microseismic positioning system based on the vibration of the roof deep hole blasting according to claim 3 is characterized in that: In step (4), the calculation formula of the source location parameters (X0, Y0, Z0, t0) is as follows: Where, t i The stations deployed for the microseismic monitoring system monitor the initial movement of the seismic wave and are manually calibrated in the system; (X i , Y i , Z i ) are the coordinates of different stations; (X0, Y0, Z0) are the spatial coordinates of the earthquake source; t0 is the time when the earthquake source occurs; V is the velocity of longitudinal wave propagation, 3700m / s; By solving the source location parameter formula, the theoretical elevation of the blasting event, that is, the theoretically calculated source elevation Z0, is obtained.

5. The method for correcting the elevation error of the microseismic positioning system based on the roof deep hole blasting vibration according to claim 4, characterized in that: In step (5), the actual blasting source elevation, i.e., the actual charging section length L y The lower and upper elevations of s , H x There are two cases of deviation value ΔZ from the theoretically calculated earthquake source elevation Z0, namely: ①H x ≤Z0≤H s ; That is, if the theoretically calculated earthquake source elevation is within the actual charging section elevation range, it is determined that the microseismic monitoring system elevation positioning has no error, that is, ΔZ = 0; ②Z0>H s Or Z0<H x ; That is, if the theoretically calculated earthquake source elevation is not within the actual charging section elevation range, it is determined that the microseismic monitoring system elevation positioning has an error, and the microseismic monitoring system elevation positioning error correction is required, that is, ΔZ = Z0-H, H is H x or H s .

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