Underpressure mining coal mine water disaster micro-seismic early warning method, device and equipment and storage medium

Abstract

The invention provides an under-pressure mining coal mine water disaster micro-seismic early warning method, device and equipment and a storage medium. The method comprises the steps that a micro-seismic event set of a to-be-monitored area is acquired; based on the longitudinal and transverse wave time difference and the waveform rise time of all micro-seismic events, screening to obtain a typical water movement micro-seismic event set; analyzing the typical water movement micro-seismic event set based on a preset micro-seismic water inrush dangerous period early warning condition, and determining whether a water inrush dangerous period exists or not; when it is determined that the water inrush danger time period exists, plane analysis is conducted on the first micro-seismic event set, and water inrush danger indexes of all positions indicated by all micro-seismic events in the first micro-seismic event set are determined; and determining a water inrush dangerous area based on the water inrush danger index of each position indicated by all the microseismic events in the first microseismic event set and the planar graph of the to-be-monitored area, and carrying out early warning on the water inrush dangerous time period and the water inrush dangerous area. According to the invention, early warning can be accurately carried out in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine water inrush monitoring, and in particular to a method, device, equipment and storage medium for microseismic early warning of water hazards in coal mines under pressure mining. Background Art

[0002] Coal mine water inrush is one of the most common disasters in coal mines. Most of the major water inrush disasters in my country's coal mines are floor water inrush, especially for pressurized mining areas. Due to the complex hydrogeological conditions and the increasing mining depth in recent years, the threat of high-pressure water inrush from Ordovician or Cambrian limestone has become increasingly serious. Even after implementing geophysical exploration, drilling, regional governance, drainage and pressure reduction measures, the risk of floor water inrush during mining is still very high. Monitoring and early warning of coal mine water inrush is an important technology to ensure safe production in coal mines and prevent and avoid water inrush accidents.

[0003] At present, coal mine water inrush warning mainly relies on sensors implanted in the rock mass to obtain data, or relies on water quality monitoring sensors to determine whether there is a sudden change in water quality, monitor changes in the resistivity of the aquiclude to determine whether the aquiclude is damaged, and so on to issue warnings.

[0004] However, the above-mentioned method of early warning through sensors has poor real-time performance and cannot achieve early warning. Summary of the invention

[0005] The embodiments of the present invention provide a method, device, equipment and storage medium for microseismic early warning of water hazards in coal mines under pressure mining, so as to solve the problem that the current coal mine water inrush early warning has poor real-time performance.

[0006] In a first aspect, an embodiment of the present invention provides a method for early warning of water hazards in a coal mine under pressure, comprising:

[0007] Acquire a microseismic event set in the area to be monitored, wherein the microseismic event set includes microseismic events in multiple time periods;

[0008] Based on the P-wave and S-wave time differences and waveform rise times of all microseismic events, a collection of typical water movement microseismic events is screened out;

[0009] Based on the preset microseismic water inrush danger period warning conditions, the typical water movement microseismic event set is analyzed to determine whether there is a water inrush danger period;

[0010] When it is determined that there is a period of water inrush danger, a plane analysis is performed on the first microseismic event set to determine the water inrush danger index of each location indicated by all microseismic events in the first microseismic event set; the first microseismic event set is the microseismic events of the preset layers in the typical water movement microseismic event set;

[0011] Based on the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set and the plan view of the area to be monitored, the water inrush hazard area is determined and an early warning is issued.

[0012] In a possible implementation, based on the P- and S-wave time differences and waveform rise times of all microseismic events, a set of typical water movement microseismic events is screened and obtained, including:

[0013] A systematic cluster analysis is performed on the P-wave and S-wave time differences of all microseismic events to screen out the second microseismic event set; wherein the second microseismic event set is a set of events with the smallest P-wave and S-wave time differences;

[0014] A systematic cluster analysis is performed on the waveform rise time of the first microseismic event set to screen out a typical water movement microseismic event set; among them, the typical water movement microseismic event set is a group of events with the largest waveform rise time in the second microseismic event set.

[0015] In a possible implementation, the microseismic water inrush danger period includes the local fissure expansion period and the local channel formation period; the preset microseismic water inrush danger period warning conditions include: the local fissure expansion period warning conditions and the local channel formation period warning conditions;

[0016] The early warning conditions for the local crack expansion period include: the presence of microseismic events less than the first preset ratio in the deep flow field, the number of microseismic events in the middle and shallow parts increases proportionally with time, and the microseismic events in the middle and shallow parts and the microseismic events in the deep flow field appear to be connected and aggregated;

[0017] The early warning conditions for the local channel formation period include: the presence of microseismic events greater than a second preset ratio in the deep flow field, and the number of microseismic events in the middle and shallow parts first increases and then decreases; wherein the second preset ratio is greater than the first preset ratio;

[0018] Based on the preset microseismic water inrush danger period warning conditions, the typical water movement microseismic event set is analyzed to determine whether there is a water inrush danger period, including:

[0019] Based on the early warning conditions of the local fissure expansion period and / or the early warning conditions of the local channel formation period, the set of typical water movement microseismic events is analyzed to determine whether there is a period of water inrush danger.

[0020] In one possible implementation, the warning conditions for the local fissure expansion period and the warning conditions for the local channel formation period are both determined based on a pre-constructed two-stage microseismic warning model. The two-stage microseismic warning model includes the local fissure expansion period, the local channel formation period and the water discharge period. The two-stage microseismic warning model is determined based on the profile of the area to be monitored and the development and connectivity of the vertical water conduit channel.

[0021] In a possible implementation, the preset layer is a layer in the middle and shallow part of the coal seam floor;

[0022] Performing a plane analysis on the first microseismic event set, determining the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set, including:

[0023] Based on the elevation of the target microseismic event, the elevation of the mining field floor, and the elevation of the highest point microseismic event in the layer, the water inrush hazard index of all target microseismic events in the first microseismic event set is determined; wherein the target microseismic event is any microseismic event in the first microseismic event set.

[0024] In a possible implementation, the water inrush hazard index T of the target microseismic event is w for:

[0025]

[0026] Among them, Z wi (x i ,y i ) is the elevation of the target microseismic event, Z m (x, y) is the stope floor elevation corresponding to the target microseismic event, Z g is the elevation of the highest microseismic event in the layer, H s is the height difference between the elevation of the coal seam floor and the elevation of the target microseismic event, H p Z is the height difference between the elevation of the highest target microseismic event in the horizon and the elevation of the stope floor. wj (xj, yj) is the elevation of the target microseismic event with the largest elevation in the first microseismic event set, Z mx (x, y) is the elevation at any position when the stope floor is inclined.

[0027] In a possible implementation, determining the water inrush hazard area based on the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set and the plan view of the area to be monitored includes:

[0028] Based on the water inrush hazard index of each position indicated by all microseismic events in the first microseismic event set, a water inrush hazard index contour line is drawn on the plane map of the area to be monitored based on the plane map of the area to be monitored;

[0029] The location with the largest value in the contour map of water inrush hazard index is determined as the water inrush hazard area.

[0030] In a second aspect, an embodiment of the present invention provides a microseismic early warning device for water hazards in a coal mine under pressure mining, comprising:

[0031] An acquisition module is used to acquire a microseismic event set in the area to be monitored, wherein the microseismic event set includes microseismic events in multiple time periods;

[0032] A screening module is used to screen out a set of typical water movement microseismic events based on the longitudinal and transverse wave time differences and waveform rise times of all microseismic events;

[0033] The first determination module is used to analyze a set of typical water movement microseismic events based on a preset microseismic water inrush danger period warning condition to determine whether there is a water inrush danger period;

[0034] The second determination module is used to perform a plane analysis on the first microseismic event set to determine the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set when it is determined that there is a water inrush hazard period; the first microseismic event set is the microseismic events of a preset layer in the typical water movement microseismic event set;

[0035] The early warning module is used to determine the water inrush hazard area based on the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set and the plan view of the area to be monitored, and to issue early warnings for water inrush hazard periods and water inrush hazard areas.

[0036] In a third aspect, an embodiment of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the processor implements the steps of the method described in the first aspect or any possible implementation manner of the first aspect.

[0037] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in the first aspect or any possible implementation method of the first aspect are implemented.

[0038] The embodiment of the present invention provides a method, device, equipment and storage medium for microseismic early warning of water hazards in coal mines under pressure mining. In order to improve the real-time nature of the early warning, a microseismic monitoring technology is used. First, a set of microseismic events in the area to be monitored is obtained. Then, based on the analysis of the longitudinal and transverse wave time differences and waveform rise times of all microseismic events, a set of typical water movement microseismic events is screened. Then, based on the preset microseismic water inrush danger period early warning conditions, by analyzing the typical water movement microseismic event set, it is determined whether there is a water inrush danger period. When determining that there is a water inrush danger period, it is also necessary to perform a plane analysis on the first microseismic event set to determine the water inrush danger index of each position indicated by all microseismic events in the first microseismic event set. Finally, based on the water inrush danger index of each position indicated by all microseismic events in the first microseismic event set and the plane map of the area to be monitored, the water inrush danger area is determined, and an early warning of the water inrush danger period and the water inrush danger area is performed. The present invention determines the water inrush danger period by vertically analyzing microseismic events in multiple time periods. After determining the water inrush danger period, it further determines the water inrush danger area through planar analysis, realizing two-way analysis, thereby being able to provide scientific and accurate two-way early warning of coal mine water hazards in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0040] Figure 1 This is a flow chart for implementing a method for early warning of water hazards in coal mines under pressure provided by an embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of a two-stage microseismic early warning model provided by an embodiment of the present invention;

[0042] Figure 3 2 is a schematic diagram of the structure of a microseismic early warning device for water hazards in a coal mine under pressure mining provided by an embodiment of the present invention;

[0043] Figure 4 is a schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0045] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0046] Microseismic monitoring technology is a new geophysical exploration technology developed in recent years. The basic principle of microseismic monitoring technology is to collect and acquire seismic wave signals emitted by rock destruction or rock fracture through sensors. Through the high-sensitivity detectors buried in advance in the coal mine, the tiny vibration signals generated by rock fracture are monitored and received, and these information are decoded into effective microseismic signals through special software, and then analyzed through the time, location, frequency, energy, etc. of the microseismic event. Since the microseismic detector has the "remote sensing" function, it can capture tiny vibration signals within the surrounding space. Therefore, this non-contact monitoring method has the advantages of large monitoring range, full-space monitoring, and strong timeliness. It can effectively solve the problems of full-space, real-time, continuous monitoring, and early warning of coal mine water inrush.

[0047] In order to solve the problems of the prior art, the embodiments of the present invention provide a method, device, equipment and storage medium for microseismic early warning of water hazards in coal mines under pressure mining. The microseismic early warning method for water hazards in coal mines under pressure mining provided by the embodiments of the present invention is first introduced below.

[0048] See also Figure 1 , which shows a flow chart of the implementation of the method for early warning of water hazards in coal mines under pressure mining provided by an embodiment of the present invention, and is described in detail as follows:

[0049] S110, obtaining a set of microseismic events in the area to be monitored.

[0050] The microseismic event set includes microseismic events in multiple time periods.

[0051] In order to obtain microseismic events in multiple time periods, it is necessary to build a microseismic monitoring system in the area to be monitored. The monitoring range of the microseismic monitoring system covers all the areas affected by mining operations and the areas affected by mining stress, as well as some areas of original rock stress. Vertically, it covers the curved subsidence zone of the roof all the way to the deep part of the main water-rich aquifer of the floor.

[0052] S120. Based on the longitudinal and transverse wave time differences and waveform rise times of all microseismic events, a set of typical water movement microseismic events is screened out.

[0053] Each microseismic event contains many attributes. In order to improve the accuracy of early warning and reduce the amount of data to be processed, the longitudinal and transverse wave time differences and waveform rise times of all microseismic events can be used to screen out a set of typical water movement microseismic events. By analyzing the microseismic events in the typical water movement microseismic event set, the difficulty of data processing is reduced and the processing speed is improved.

[0054] In some embodiments, all microseismic events may be screened based on a clustering method.

[0055] In this embodiment, first, a systematic cluster analysis can be performed on the P-wave and S-wave time differences of all microseismic events to screen out a second microseismic event set, wherein the second microseismic event set is a set of events with the smallest P-wave and S-wave time differences.

[0056] Then, cluster analysis is performed on the waveform rise time of the second microseismic event set to screen out a typical water movement microseismic event set, wherein the typical water movement microseismic event set is a set of events with the largest waveform rise time in the second microseismic event set.

[0057] Specifically, the P-wave and S-wave time differences of all microseismic events are systematically clustered, and the class with the smallest P-wave and S-wave time differences is selected to form the second microseismic event set B. Then, the waveform rise time is systematically clustered in the second microseismic event set B, and the class with the largest waveform rise time is selected to form the typical water movement microseismic event set C. After two systematic clustering screenings, the obtained set is the typical water movement microseismic event set C.

[0058] In some embodiments, all microseismic events may be screened based on classification algorithms such as C4.5 and SVM, and also based on the longitudinal and transverse wave time differences and waveform rise time, which will not be described in detail here.

[0059] S130. Based on the preset microseismic water inrush danger period warning conditions, a set of typical water movement microseismic events is analyzed to determine whether there is a water inrush danger period.

[0060] In some embodiments, in order to accurately provide early warning, the inventors considered the development process of the vertical channel through vertical analysis and constructed a two-stage microseismic early warning model through analysis. Figure 2As shown in the figure, the two-stage microseismic early warning model includes the local fissure expansion period, the local channel formation period and the water-out period. The two-stage microseismic early warning model is determined based on the profile of the area to be monitored and the development and penetration of the vertical water-conducting channel. First, microseismic events occur in the deep flow field, indicating that the flow field is disturbed and there is a driving force for water inrush. Then, the microseismic events in the middle and shallow parts gradually increase from nothing to something, reflecting the development of fissures. When the number of microseismic events increases to a certain extent, the fissures are sufficiently developed and the fissures will be connected. The connection of the fissures means penetration. Afterwards, in the local channel formation period, the fissures become smoother and smoother water-conducting channels under the action of water pressure, and the number of microseismic events in this process decreases. Finally, a large amount of water from the aquifer reaches the mining space, which is the water-out period. Figure 2 The applicable condition is that microseismic events continue to occur in the deep flow field. Figure 2 The states of each stage described include: during the local fissure expansion period, the risk of water outburst increases; during the local channel formation period, water outburst is imminent; after the local channel is formed, it enters the water inrush period.

[0061] In this embodiment, the preset warning conditions for the microseismic water inrush danger period include: warning conditions for the local fissure expansion period and warning conditions for the local channel formation period. The warning conditions for the local fissure expansion period and the warning conditions for the local channel formation period are both determined based on a pre-constructed microseismic two-stage warning model.

[0062] The early warning conditions for the local fissure expansion period include: the presence of microseismic events less than a first preset ratio in the deep flow field, the number of microseismic events in the middle and shallow parts increases proportionally with time, and the microseismic events in the middle and shallow parts and the microseismic events in the deep flow field appear to be interconnected and aggregated.

[0063] Among them, the presence of microseismic events less than the first preset ratio in the deep flow field means that there are fewer microseismic events in the deep flow field, and the first preset ratio here can be the ratio of the number of microseismic events occurring in the deep process to the total number of microseismic events in the typical water movement microseismic event set. Of course, it can also be the ratio of the number of microseismic events occurring in the deep process to the total number of microseismic events occurring in the middle and shallow parts, which is not limited here. The number of microseismic events in the middle and shallow parts increases proportionally with time, which means that the microseismic events in the middle and shallow parts have experienced a change process from few to many and the number is still increasing. The microseismic events in the middle and shallow parts and the microseismic events in the deep flow field appear in a through-type aggregation, which means that the water-guiding channels of the middle and shallow parts and the deep flow fields are connected. The peak number of microseismic events may coincide with the time of the through-connection, or it may lag behind the through-connection time.

[0064] Only when the following three conditions are met simultaneously: the number of microseismic events in the deep flow field is less than the first preset ratio, the number of microseismic events in the middle and shallow parts increases proportionally with time, and the microseismic events in the middle and shallow parts and the microseismic events in the deep flow field are clustered in a continuous manner, can it be determined that the early warning conditions for the local fracture expansion period are met.

[0065] The early warning conditions for the local channel formation period include: the presence of microseismic events greater than the second preset ratio in the deep flow field, and the number of microseismic events in the middle and shallow parts first increases and then decreases. Among them, the second preset ratio is greater than the first preset ratio, and the calculation method of the second preset ratio is the same as the calculation method of the first preset ratio, which will not be repeated here.

[0066] Among them, the presence of microseismic events greater than the second preset ratio in the deep flow field means that microseismic events continue to exist in the deep flow field, and the number of microseismic events in the middle and shallow parts first increases and then decreases, which means that the microseismic events in the middle and shallow parts have experienced a process of decrease after penetration, and overall increase and decrease, with an obvious peak, and are in the post-peak stage.

[0067] The disturbance of the deep flow field is the fundamental reason for the development of vertical channels and provides the original driving force for the development of vertical channels. Therefore, the presence of microseismic events greater than the second preset ratio in the deep flow field, that is, the continuous presence of microseismic events in the deep flow field, is the first condition for vertical judgment. When the two conditions of the presence of microseismic events greater than the second preset ratio in the deep flow field and the number of microseismic events in the middle and shallow parts first increases and then decreases are met at the same time, the early warning conditions for the local channel formation period can be determined.

[0068] When it is determined that the three conditions for early warning during the local fissure expansion period are met simultaneously, and / or the two conditions for early warning during the local channel formation period are met simultaneously, a water inrush early warning can be issued.

[0069] It should be noted that the deep flow field refers to the water-rich aquifer, and the middle and shallow part refers to the middle area above the deep flow field below the mining area.

[0070] S140. When it is determined that there is a water inrush hazard period, a planar analysis is performed on the first microseismic event set to determine the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set.

[0071] Among them, the first microseismic event set is the microseismic events of the preset layer in the typical water movement microseismic event set. Specifically, the first microseismic event set is the microseismic events of the middle and shallow layers of the coal seam floor in the typical water movement microseismic event set, that is, the microseismic events closest to the mining area floor layer.

[0072] Only after determining the period of time when there is a risk of water inrush can a plane analysis be carried out to determine the area of ​​water inrush risk.

[0073] In some embodiments, the water inrush hazard index of each location indicated by all target microseismic events in the first microseismic event set can be determined based on the elevation of the target microseismic event, the elevation of the stope floor, and the elevation of the highest microseismic event in the layer, wherein the target microseismic event is any microseismic event in the first microseismic event set.

[0074] Set the elevation of the i-th microseismic event to Z wi (x i ,y i ), each microseismic event corresponds to an elevation Z w , and each microseismic event corresponds to a fixed (x, y). The elevation Z of the stope floor m (x, y), the elevation Z of the highest microseismic event in the layer g . Elevation Z of the stope floor m is a function of the plane position (x, y) of the bottom plate. The elevation Z of the highest microseismic event in the layer g is a fixed value, that is, there is only one highest point in a period of time, and the corresponding microseismic event elevation Z is only one highest point g .

[0075] If there is no microseismic event above the mining floor elevation (generally more likely to occur in near-horizontal coal seams), the height difference H between the elevation of the coal seam floor and the elevation of the microseismic event at that location is s =Z m (x,y)-Z wi (x i ,y i ). Height difference H s It is the distance between the actual water body and the bottom of the coal seam. The smaller it is, the more dangerous it is. The smallest point is the dangerous area for water inrush.

[0076] Microseismic water inrush hazard index T w =1 / H s =1 / [Z m (x,y)-Z wi (x i ,y i )]. The larger Tw is, the more dangerous the area is.

[0077] If the elevation of the microseismic event with the highest elevation exceeds the elevation of the floor of a certain location in the mining area (generally more likely to occur in inclined coal seams), and there are microseismic events in this location and in this layer, then this location is a water inrush danger area. If there are several such locations at the same time (or the area is large), the following method can be used to evaluate their water inrush danger levels.

[0078] Set the height difference H between the microseismic event elevation at the highest point in the layer and the elevation of the stope floor p =Z g -Z m (x,y). Microseismic water inrush hazard index T w =H p / H s =[Z g -Z m (x,y)] / [Z m (x,y)-Zwi (x i ,y i )]. w The larger it is, the more dangerous the area is.

[0079] Combining the above two situations, the water inrush hazard index T of the target microseismic event is w for:

[0080]

[0081] Among them, Z wi (x i ,y i ) is the elevation of the target microseismic event, Z m (x, y) is the stope floor elevation corresponding to the target microseismic event, Z g is the elevation of the highest microseismic event in the layer, H s is the height difference between the elevation of the coal seam floor and the elevation of the target microseismic event, H p Z is the height difference between the elevation of the highest target microseismic event in the horizon and the elevation of the stope floor. wj (xj, yj) is the elevation of the target microseismic event with the largest elevation in the first microseismic event set, Z mx (x, y) is the elevation of any position when the stope floor is tilted. wj (x j ,y j )>Z mx (x,y), which means that there is a microseismic event whose elevation is greater than the elevation of at least one floor. m (x,y)>Z wi (x i ,y i ), which means that for all microseismic events, their elevations are all lower than the bottom plate elevation within the monitoring range.

[0082] S150. Based on the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set and the plan view of the area to be monitored, determine the water inrush hazard area, and issue an early warning for the water inrush hazard period and water inrush hazard area.

[0083] In some embodiments, first, based on the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set, a water inrush hazard index contour plane map of the area to be monitored can be generated based on the plane map of the area to be monitored. Then, the location with the largest value in the water inrush hazard index contour plane map is determined as the water inrush hazard area.

[0084] The present invention provides a microseismic early warning method for water hazards in coal mines under pressure mining. In order to improve the accuracy of early warning, a microseismic monitoring technology is adopted. First, a set of microseismic events in the area to be monitored is obtained. Then, based on the analysis of the longitudinal and transverse wave time differences and waveform rise times of all microseismic events, a set of typical water movement microseismic events is screened. Then, based on the preset microseismic water inrush danger period early warning conditions, by analyzing the typical water movement microseismic event set, it is determined whether there is a water inrush danger period. When determining that there is a water inrush danger period, it is also necessary to perform a plane analysis on the first microseismic event set to determine the water inrush danger index of each position indicated by all microseismic events in the first microseismic event set. Finally, based on the water inrush danger index of each position indicated by all microseismic events in the first microseismic event set and the plane map of the area to be monitored, the water inrush danger area is determined, and an early warning of the water inrush danger period and the water inrush danger area is performed. The present invention determines the water inrush danger period by vertically analyzing microseismic events in multiple time periods. After determining the water inrush danger period, it further determines the water inrush danger area through planar analysis, realizing two-way analysis, thereby being able to provide scientific and accurate two-way early warning of coal mine water hazards in real time.

[0085] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0086] Based on the microseismic early warning method for water hazard in coal mines under pressure mining provided in the above embodiment, the present invention also provides a specific implementation of a microseismic early warning device for water hazard in coal mines under pressure mining applied to the microseismic early warning method for water hazard in coal mines under pressure mining. Please refer to the following embodiment.

[0087] like Figure 3 As shown, a microseismic early warning device 300 for water hazards in a coal mine under pressure mining is provided, and the device comprises:

[0088] An acquisition module 310 is used to acquire a microseismic event set in a to-be-monitored area, wherein the microseismic event set includes microseismic events in multiple time periods;

[0089] A screening module 320 is used to screen out a set of typical water movement microseismic events based on the longitudinal and transverse wave time differences and waveform rise times of all microseismic events;

[0090] The first determination module 330 is used to analyze a typical water movement microseismic event set based on a preset microseismic water inrush danger period warning condition to determine whether there is a water inrush danger period;

[0091] The second determination module 340 is used to perform a plane analysis on the first microseismic event set to determine the water inrush hazard index of each position indicated by all microseismic events in the first microseismic event set when it is determined that there is a water inrush hazard period; the first microseismic event set is the microseismic events of a preset layer in the typical water movement microseismic event set;

[0092] The early warning module 350 is used to determine the water inrush hazard area and issue an early warning based on the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set and the plan view of the area to be monitored.

[0093] In a possible implementation, the screening module 320 is used to perform a systematic cluster analysis on the P-wave and S-wave time differences of all microseismic events to screen out a second microseismic event set; wherein the second microseismic event set is a set of events with the smallest P-wave and S-wave time differences;

[0094] A systematic cluster analysis was performed on the waveform rise time of the second microseismic event set to screen out a typical water movement microseismic event set; among them, the typical water movement microseismic event set is a group of events with the largest waveform rise time in the second microseismic event set.

[0095] In a possible implementation, the microseismic water inrush danger period includes the local fissure expansion period and the local channel formation period; the preset microseismic water inrush danger period warning conditions include: the local fissure expansion period warning conditions and the local channel formation period warning conditions;

[0096] The early warning conditions for the local crack expansion period include: the presence of microseismic events less than the first preset ratio in the deep flow field, the number of microseismic events in the middle and shallow parts increases proportionally with time, and the microseismic events in the middle and shallow parts and the microseismic events in the deep flow field appear to be connected and aggregated;

[0097] The early warning conditions for the local channel formation period include: the presence of microseismic events greater than a second preset ratio in the deep flow field, and the number of microseismic events in the middle and shallow parts first increases and then decreases; wherein the second preset ratio is greater than the first preset ratio;

[0098] The first determination module 330 is used to analyze a set of typical water movement microseismic events based on the early warning conditions of the local fracture expansion period and / or the early warning conditions of the local channel formation period to determine whether there is a period of water inrush danger.

[0099] In one possible implementation, the warning conditions for the local fissure expansion period and the warning conditions for the local channel formation period are both determined based on a pre-constructed two-stage microseismic warning model. The two-stage microseismic warning model includes the local fissure expansion period, the local channel formation period and the water discharge period. The two-stage microseismic warning model is determined based on the profile of the area to be monitored and the development and connectivity of the vertical water conduit channel.

[0100] In a possible implementation, the preset layer is a layer in the middle and shallow part of the coal seam floor;

[0101] The second determination module 340 is used to determine the water inrush hazard index of each location indicated by all target microseismic events in the first microseismic event set based on the elevation of the target microseismic event, the elevation of the mining field floor, and the elevation of the highest point microseismic event in the layer; wherein the target microseismic event is any microseismic event in the first microseismic event set.

[0102] In a possible implementation, the water inrush hazard index T of the target microseismic event is w for:

[0103]

[0104] Among them, Z wi (x i ,y i ) is the elevation of the target microseismic event, Z m (x, y) is the stope floor elevation corresponding to the target microseismic event, Z g is the elevation of the highest microseismic event in the layer, H s is the height difference between the elevation of the coal seam floor and the elevation of the target microseismic event, H p Z is the height difference between the elevation of the highest target microseismic event in the horizon and the elevation of the stope floor. wj (xj, yj) is the elevation of the target microseismic event with the largest elevation in the first microseismic event set, Z mx (x, y) is the elevation at any position when the stope floor is inclined.

[0105] In a possible implementation, the early warning module 350 is used to draw water inrush hazard index contour lines on a plane map of the area to be monitored based on the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set and based on the plane map of the area to be monitored;

[0106] The location with the largest value in the contour map of water inrush hazard index is determined as the water inrush hazard area.

[0107] Figure 4 Schematic diagram of an electronic device provided by an embodiment of the present invention. Figure 4 As shown, the electronic device 4 of this embodiment includes: a processor 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processor 40. When the processor 40 executes the computer program 42, the steps in the above-mentioned embodiments of the method for microseismic early warning of water hazards in coal mines under pressure are implemented, such as Figure 1Alternatively, when the processor 40 executes the computer program 42, the functions of each module in the above-mentioned device embodiments are realized, for example, Figure 3 The functions of modules 310 to 350 are shown.

[0108] Exemplarily, the computer program 42 may be divided into one or more modules, which are stored in the memory 41 and executed by the processor 40 to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program 42 in the electronic device 4. For example, the computer program 42 may be divided into Figure 3 Modules 310 to 350 are shown.

[0109] The electronic device 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will appreciate that Figure 4 It is only an example of the electronic device 4 and does not constitute a limitation of the electronic device 4. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electronic device may also include input and output devices, network access devices, buses, etc.

[0110] The processor 40 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0111] The memory 41 may be an internal storage unit of the electronic device 4, such as a hard disk or memory of the electronic device 4. The memory 41 may also be an external storage device of the electronic device 4, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 4. Further, the memory 41 may also include both an internal storage unit and an external storage device of the electronic device 4. The memory 41 is used to store the computer program and other programs and data required by the electronic device. The memory 41 may also be used to temporarily store data that has been output or is to be output.

[0112] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0113] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0114] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0115] In the embodiments provided by the present invention, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0116] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0117] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0118] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned embodiments of the microseismic early warning method for water hazards in coal mines under pressure mining can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium.

[0119] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A microseismic early warning method for water hazards in coal mines under pressure mining, characterized in that: include: Acquire a microseismic event set in the area to be monitored, wherein the microseismic event set includes microseismic events in multiple time periods; Based on the P- and S-wave time differences and waveform rise times of all the microseismic events, a set of typical water movement microseismic events is screened out; Based on the preset microseismic water inrush danger period warning conditions, the typical water movement microseismic event set is analyzed to determine whether there is a water inrush danger period; When it is determined that there is a period of water inrush danger, a plane analysis is performed on the first microseismic event set to determine the water inrush danger index of each location indicated by all microseismic events in the first microseismic event set; the first microseismic event set is the microseismic events of the preset layers in the typical water movement microseismic event set; Based on the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set and the plan view of the area to be monitored, the water inrush hazard area is determined, and early warnings are issued for the water inrush hazard period and water inrush hazard area.

2. The microseismic early warning method for water hazards in coal mines under pressure mining as claimed in claim 1, characterized in that: The typical water movement microseismic event set is screened based on the longitudinal and transverse wave time differences and waveform rise times of all the microseismic events, including: Performing a systematic cluster analysis on the P-wave and S-wave time differences of all the microseismic events to screen out a second microseismic event set; wherein the second microseismic event set is a set of events with the smallest P-wave and S-wave time differences; A systematic cluster analysis is performed on the waveform rise time of the second microseismic event set to screen out a typical water movement microseismic event set; wherein the typical water movement microseismic event set is a group of event sets with the largest waveform rise time in the second microseismic event set.

3. The microseismic early warning method for water hazards in coal mines under pressure mining as claimed in claim 1, characterized in that: The microseismic water inrush danger period includes the local fissure expansion period and the local channel formation period; the preset microseismic water inrush danger period warning conditions include: the local fissure expansion period warning conditions and the local channel formation period warning conditions; The early warning conditions of the local crack expansion period include: there are microseismic events less than a first preset ratio in the deep flow field, the number of microseismic events in the middle and shallow parts increases in direct proportion with time, and the microseismic events in the middle and shallow parts and the microseismic events in the deep flow field appear to be connected and aggregated; The early warning conditions of the local channel formation period include: there are microseismic events greater than a second preset ratio in the deep flow field, and the number of microseismic events in the middle and shallow parts increases first and then decreases; wherein the second preset ratio is greater than the first preset ratio; The method of analyzing the typical water movement microseismic event set based on the preset microseismic water inrush danger period warning condition to determine whether there is a water inrush danger period includes: Based on the early warning conditions of the local fissure expansion period and / or the early warning conditions of the local channel formation period, the typical water movement microseismic event set is analyzed to determine whether there is a period of water inrush danger.

4. The microseismic early warning method for water hazards in coal mines under pressure mining as claimed in claim 3, characterized in that: The warning conditions for the local fissure expansion period and the warning conditions for the local channel formation period are both determined based on a pre-constructed two-stage microseismic warning model, which includes the local fissure expansion period, the local channel formation period and the water discharge period. The two-stage microseismic warning model is determined based on the cross-sectional view of the area to be monitored and the development and connectivity of the vertical water conduit channel.

5. The microseismic early warning method for water hazards in coal mines under pressure mining as claimed in claim 1, characterized in that: The preset horizon is a horizon in the middle and shallow part of the coal seam floor; The performing of a plane analysis on the first microseismic event set to determine the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set includes: Based on the elevation of the target microseismic event, the elevation of the mining field floor, and the elevation of the highest point microseismic event in the layer, the water inrush hazard index of each location indicated by all target microseismic events in the first microseismic event set is determined; wherein the target microseismic event is any microseismic event in the first microseismic event set.

6. The microseismic early warning method for water hazards in coal mines under pressure mining as claimed in claim 5, characterized in that: The water inrush hazard index T of the target microseismic event w for: Among them, Z wi (x i ,y i ) is the elevation of the target microseismic event, Z m (x, y) is the stope floor elevation corresponding to the target microseismic event, Z g is the elevation of the highest microseismic event in the layer, H s is the height difference between the elevation of the coal seam floor and the elevation of the target microseismic event, H p Z is the height difference between the elevation of the highest target microseismic event in the horizon and the elevation of the stope floor. wj (xj, yj) is the elevation of the target microseismic event with the largest elevation in the first microseismic event set, Z mx (x, y) is the elevation at any position when the stope floor is inclined.

7. The microseismic early warning method for water hazards in coal mines under pressure mining as described in any one of claims 1 to 6, characterized in that: The step of determining the water inrush hazard area based on the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set and the plan view of the area to be monitored includes: Based on the water inrush hazard index of each position indicated by all microseismic events in the first microseismic event set, generating a water inrush hazard index contour line plane map of the area to be monitored based on the plane map of the area to be monitored; The location with the largest value in the water inrush hazard index contour plane map is determined as the water inrush hazard area.

8. A microseismic early warning device for water hazards in coal mines under pressure mining, characterized in that: include: An acquisition module, used to acquire a microseismic event set in a to-be-monitored area, wherein the microseismic event set includes microseismic events in multiple time periods; A screening module, for screening a set of typical water movement microseismic events based on the longitudinal and transverse wave time differences and waveform rise times of all the microseismic events; The first determination module is used to analyze the typical water movement microseismic event set based on the preset microseismic water inrush danger period warning condition to determine whether there is a water inrush danger period; The second determination module is used to perform a plane analysis on the first microseismic event set to determine the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set when it is determined that there is a water inrush hazard period; the first microseismic event set is the microseismic events of a preset layer in the typical water movement microseismic event set; The early warning module is used to determine the water inrush hazard area based on the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set and the plan view of the area to be monitored, and to issue early warnings for water inrush hazard periods and water inrush hazard areas.

9. An electronic device, characterized in that: The method comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

Images