Method for correcting elevation error of microseismic positioning system based on roof deep-hole blasting vibration

Abstract

A method for correcting the elevation error of a microseismic positioning system based on vibration from deep-hole blasting of the roof includes the following steps: determining the deep location of the underground coal and rock mass for the pre-construction deep-hole blasting of the roof; confirming the actual construction parameters of the deep-hole blasting of the roof; confirming the actual elevation of the vibration generated by the blasting; obtaining the theoretical elevation of the blasting event calculated by the microseismic system; calculating the deviation between the actual source elevation of the blasting and the theoretically calculated source elevation; if the theoretical elevation is not within the range of the actual source elevation, 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 to eliminate random errors, thereby obtaining the elevation positioning correction parameters of the microseismic monitoring system. This invention corrects the spatial location error of the microseismic monitoring system, especially for the elevation error of high-energy microseismic events, accurately obtaining the high-energy disaster-causing strata, realizing the identification of the actual occurrence strata of high-energy events, and ensuring safe mining of coal mines.

Description

Technical Field

[0001] This invention relates to a method for correcting the elevation error of a microseismic positioning system based on the vibration of deep-hole blasting of the roof, belonging to the field of coal mine safety mining technology. Background Technology

[0002] Rockburst refers to the dynamic phenomenon in which the rock mass surrounding a mine shaft or working face is suddenly destroyed due to the instantaneous release of elastic deformation energy. Its enormous destructive power poses a great threat to safe mining underground. Therefore, it is necessary to monitor and warn of rockburst hazards and take preventive measures to ensure safe and efficient coal mine production.

[0003] Currently, microseismic monitoring technology is used to monitor rockbursts in coal mines. This mainly involves deploying a network of microseismic stations within the mine to monitor the fracturing of coal and rock masses underground. By analyzing the precursor information such as the aperture location, energy, and frequency of coal and rock mass fracturing events recorded by the monitoring network, comprehensive monitoring and early warning of rockbursts in the mine are achieved. However, since most of the stations in the microseismic monitoring system are located in the coal seam roadways, although they are arranged according to the principle of denser placement inside and sparser placement outside in the plane, it is difficult to form an effective envelope in space. Therefore, while the microseismic monitoring system has high plane positioning accuracy, its spatial positioning error is relatively large. This makes it impossible to accurately determine the specific stratum where high-energy disaster-causing mine seismic events occur, and thus, targeted prevention and control measures cannot be taken, resulting in a lack of guarantee for safe production underground. Summary of the Invention

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

[0005] To achieve the above objectives, the present invention provides a method for correcting the elevation error of a microseismic positioning system based on the vibration of deep-hole blasting of the roof plate, comprising the following steps:

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

[0007] (2) Confirm the actual construction parameters for deep hole blasting of the roof, including the opening position, actual hole depth and actual charge section length;

[0008] (3) Confirm the actual elevation of the vibration triggered by the blast;

[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 source elevation of the blasting and the theoretically calculated source elevation; if the theoretical elevation is not within the range of the actual source elevation, 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) multiple times to eliminate random errors, determine the deviation between the actual source elevation and the theoretically calculated elevation, and then perform error judgment and correction of the microseismic monitoring system elevation positioning through step (5) to obtain the microseismic monitoring system elevation positioning correction parameters.

[0012] Furthermore, in step (2), the opening location is at the top of the roadway; the actual hole depth is L, and the actual length of the charging section is L. y It is 1 / 3 of the actual hole depth, that is .

[0013] Furthermore, in step (3), the actual elevation of the blast-induced vibration is considered as the actual length L of the charge section. y The actual length of the charge section L y The lower and upper elevations are H respectively. s H x H s H x The process of determining is as follows:

[0014] ① Determine the elevation h of the deep hole blasting opening location on the construction roof based on the guide points;

[0015] ② Determine H s H x They are respectively: , ;

[0016] in, The angle of the blasting pressure relief hole.

[0017] Furthermore, in step (4), the calculation formula for the source location parameters (X0, Y0, Z0, t0) is as follows:

[0018] ;

[0019] In the formula, t i For the microseismic monitoring system, stations are deployed to monitor the initial motion time of seismic waves, and manual calibration is performed on the system; (X) i Y i Z i (X0, Y0, Z0) represent the coordinates of different stations; (X0, Y0, Z0) represent the spatial coordinates of the seismic source; t0 represents the time of seismic source occurrence; V represents the P-wave propagation velocity, 3700 m / s;

[0020] By solving the formula for the source location parameters, the theoretical elevation of the blasting event, i.e., the theoretically calculated source elevation Z0, is obtained.

[0021] Furthermore, in step (5), the actual source elevation of the blast, i.e., the actual length L of the charge section, is... y The lower elevation and the upper elevation H s H x The deviation ΔZ between the calculated focal elevation Z0 and the theoretically calculated focal elevation can be categorized into two cases:

[0022] ①H x ≤Z0≤ H s ;

[0023] If the theoretically calculated source elevation is within the actual loading section elevation range, then the microseismic monitoring system is deemed to have no elevation positioning error, i.e., ΔZ=0.

[0024] ②Z0>H s Or Z0 < H x ;

[0025] If the theoretically calculated source elevation is outside the actual elevation range of the explosive charge section, it is determined that there is an error in the elevation positioning of the microseismic monitoring system, and a correction for the elevation positioning error of the microseismic monitoring system is required, ΔZ = Z0 - H, where H is the elevation position of the explosive charge section. x or H s .

[0026] This invention determines the deep location of the underground coal and rock mass for pre-construction deep-hole blasting of the roof, confirms the actual construction parameters of the deep-hole blasting, confirms the actual elevation of the blast-induced vibration, derives the theoretical elevation of the blasting event calculated by the microseismic system, calculates the deviation between the actual blast source elevation and the theoretically calculated source elevation, and determines that there is an error in the elevation positioning of the microseismic monitoring system when the theoretical elevation is not within the range of the actual source elevation. The invention then corrects this error, eliminating random errors and deriving the corrected elevation positioning parameters for the microseismic monitoring system. By correcting the spatial location errors of the microseismic monitoring system, especially for the elevation of high-energy microseismic events, this invention accurately obtains the high-energy disaster-causing strata, enabling the identification of the actual occurrence strata of high-energy events and ensuring safe coal mining. Attached Figure Description

[0027] Figure 1 This is a flowchart of the process of this invention;

[0028] Figure 2 This is a schematic diagram of the calculation of decompression blasting parameters and the relative position of the seismic source in this invention. Detailed Implementation

[0029] The invention will now be further described with reference to the accompanying drawings.

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

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

[0032] (2) Confirm the actual construction parameters for deep hole blasting of the roof, including the opening position, actual hole depth and actual charge section length;

[0033] (3) Confirm the actual elevation of the vibration triggered by the blast;

[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 source elevation of the blasting and the theoretically calculated source elevation; if the theoretical elevation is not within the range of the actual source elevation, 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) multiple times to eliminate random errors, determine the deviation between the actual source elevation and the theoretically calculated elevation, and then perform error judgment and correction of the microseismic monitoring system elevation positioning through step (5) to obtain the microseismic monitoring system elevation positioning correction parameters.

[0037] Example: (1) Taking the 250101-2 working face of a certain mine as an example, the 250101-2 working face is highly dangerous due to the high stress of the overlying coal pillar. Therefore, deep hole blasting measures are carried out at the shoulder corner of the coal wall of the working face to relieve the danger and pressure.

[0038] (2) Confirm the actual construction parameters for deep hole blasting on the roof: the hole location is at the roof of the roadway, the actual hole depth L is 70m, and the length of the charging section L y It is 20 m;

[0039] (3) Confirm the actual elevation of the blasting vibration, and determine the elevation of the deep hole blasting opening position on the construction roof based on the guide point, h=1005m, and the elevation of the upper and lower ends of the actual charging section, H. s H x , , , The inclination angle of the blasting relief hole is 60 degrees; the actual elevation of the actual charging section, considered as the actual elevation of the blasting vibration, is [1035.53, 1052.96].

[0040] (4) such as Figure 2As shown, a microseismic monitoring system is used to collect and record the seismic wave waveform signals generated by the blast, and the source location parameters are solved to analytically derive the theoretical elevation of the blasting event calculated by the microseismic system. The calculation formula for the source parameters (X0, Y0, Z0, t0) calculated by the microseismic monitoring system is as follows:

[0041] V represents the longitudinal wave propagation speed, 3700 m / s;

[0042] We obtain Z0 = 1015.57m;

[0043] (5) Since Z0 = 1015.57m < H x =1035.53 m, therefore the deviation value ΔZ=1015.57-1035.53=-19.96m, that is, the theoretically calculated elevation of the microseismic monitoring system is 19.96m lower than the actual elevation;

[0044] (6) Repeat steps (1) to (5) to eliminate random 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 theoretical calculated elevation

[0046]

[0047] (7) Based on multiple sets of repeated test data, the elevation deviation of the microseismic monitoring system was determined to be approximately 18m, meaning that the theoretical elevation of the microseismic monitoring system was about 18m lower than the actual elevation.

Claims

1. A method for correcting elevation errors in a microseismic positioning system based on vibration from deep-hole blasting of the roof, characterized in that, Includes the following steps: (1) Determine the deep location of the underground coal and rock mass for the pre-construction deep hole blasting of the roof; (2) Confirm the actual construction parameters for deep hole blasting of the roof, including the opening position, actual hole depth and actual charge section length; (3) Confirm the actual elevation of the vibration triggered by the blast; (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 source elevation of the blasting and the theoretically calculated source elevation; if the theoretical elevation is not within the range of the actual source elevation, 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) multiple times to eliminate random errors, determine the deviation between the actual source elevation and the theoretically calculated elevation, and perform error judgment and correction of the microseismic monitoring system elevation positioning through step (5) to obtain the microseismic monitoring system elevation positioning correction parameters. The deviation value between the actual source elevation of the blasting in the step (5) and the theoretically calculated source elevation, i.e. the actual charge length L y The deviation value ΔZ between the lower end elevation and the upper end elevation H s , H x and the theoretically calculated source elevation Z0, there are two cases, respectively: ①H x ≤Z0≤ H s ; If the theoretically calculated source elevation is within the actual loading section elevation range, then the microseismic monitoring system is deemed to have no elevation positioning error, i.e., ΔZ=0. ②Z0>H s Or Z0 < H x ; If the theoretically calculated source elevation is outside the actual elevation range of the explosive charge section, it is determined that there is an error in the elevation positioning of the microseismic monitoring system, and a correction for the elevation positioning error of the microseismic monitoring system is required, i.e., ΔZ = Z0 - H, where H is H x or H s .

2. The method for correcting the elevation error of a microseismic positioning system based on the vibration of deep-hole blasting in the top plate, as described in claim 1, is characterized in that... In step (2), the opening location is at the top of the roadway; the actual hole depth is L, and the actual length of the charging section is L. y It is 1 / 3 of the actual hole depth, that is .

3. The method for correcting the elevation error of a microseismic positioning system based on deep-hole blasting vibration of the top plate according to claim 2, characterized in that, In step (3), the actual elevation of the blast-induced vibration is considered as the actual charge section length L. y , Among them, the actual length of the charge section L y The lower and upper elevations are H respectively. s H x H s H x The process of determining is as follows: ① Determine the elevation h of the deep hole blasting opening location on the construction roof based on the guide points; ② Determine H s H x They are respectively: , ; in, The angle of the blasting pressure relief hole.

4. The method for correcting the elevation error of a microseismic positioning system based on deep-hole blasting vibration of the roof plate according to claim 3, characterized in that, In step (4), the calculation formula for the source location parameters (X0, Y0, Z0, t0) is as follows: ； In the formula, t i For the microseismic monitoring system, stations are deployed to monitor the initial motion time of seismic waves, and manual calibration is performed on the system; (X) i Y i Z i (X0, Y0, Z0) represent the coordinates of different stations; (X0, Y0, Z0) represent the spatial coordinates of the seismic source; t0 represents the time of seismic source occurrence; V represents the P-wave propagation velocity, 3700 m / s; By solving the formula for the source location parameters, the theoretical elevation of the blasting event, i.e., the theoretically calculated source elevation Z0, is obtained.

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