Microseismic early warning method, device and equipment for water disaster in coal mine with pressure mining and storage medium

Abstract

The present application provides a coal mine water hazard microseismic early warning method, device, equipment and storage medium under pressure, which comprises the following steps: obtaining a microseismic event set of a region to be monitored; based on the P-S wave time difference and the waveform rise time of all microseismic events, a typical water movement microseismic event set is screened; based on the preset microseismic water inrush danger period warning condition, 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 water inrush danger period, a plane analysis is performed 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; based on the water inrush danger index of each position indicated by all microseismic events in the first microseismic event set and the plan of the region to be monitored, a water inrush danger area is determined, and early warning of the water inrush danger period and the water inrush danger area is performed. The present application can perform real-time and accurate early warning.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine water inrush monitoring, and particularly relates to a microseismic early warning method, device and equipment for water disaster in coal mining under pressure and a storage medium. BACKGROUND

[0002] Coal mine water inrush is one of the main disasters in coal mines, and most of the large water inrush disasters in coal mines in China are floor water inrush, especially for mining areas under pressure, because the hydrogeological conditions are relatively complex, and with the increase of mining depth in recent years, the threat of Ordovician or Cambrian limestone high-pressure water inrush is becoming increasingly serious. Even after implementing measures such as geophysical prospecting, drilling, regional treatment, water drainage and pressure reduction, the risk of floor water inrush in the recovery process is still high. Monitoring and early warning of coal mine water inrush is an important technology to ensure the safety of coal mine production and prevent and avoid water inrush accidents.

[0003] At present, coal mine water inrush early warning mainly relies on sensors implanted in rock mass to obtain data, or relies on water quality monitoring sensors to determine whether the water quality has changed, and monitors the change of the resistivity of the aquiclude to determine whether the aquiclude has been damaged.

[0004] However, the real-time performance of the above-mentioned method for early warning through sensors is poor, and early warning cannot be achieved. SUMMARY

[0005] The present application provides a microseismic early warning method, device, equipment and storage medium for water disaster in coal mining under pressure to solve the problem of poor real-time performance of current coal mine water inrush early warning.

[0006] In a first aspect, the present application provides a microseismic early warning method for water disaster in coal mining under pressure, comprising:

[0007] obtaining a microseismic event set of a region to be monitored, wherein the microseismic event set comprises microseismic events in multiple time periods;

[0008] screening a typical water movement microseismic event set based on the P-S wave time difference and the waveform rise time of all microseismic events;

[0009] analyzing the typical water movement microseismic event set based on a preset microseismic water inrush dangerous period early warning condition to determine whether there is a water inrush dangerous period;

[0010] when it is determined that there is a water inrush dangerous period, performing plane analysis on the first microseismic event set to determine the water inrush risk index of each position indicated by all microseismic events in the first microseismic event set; the first microseismic event set is the microseismic event of the preset layer in the typical water movement microseismic event set;

[0011] Based on the water inrush risk indexes of the respective positions indicated by all the microseismic events in the first microseismic event set and the plan view of the region to be monitored, a water inrush risk region is determined, and a warning is given.

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

[0013] The P-S wave time difference of all the microseismic events is subjected to systematic cluster analysis, and a second microseismic event set is screened out; the second microseismic event set is a group of event sets with the minimum P-S wave time difference value;

[0014] The waveform rise time of the first microseismic event set is subjected to systematic cluster analysis, and a typical water movement microseismic event set is screened out; the typical water movement microseismic event set is a group of event sets with the maximum waveform rise time in the second microseismic event set.

[0015] In a possible implementation, the microseismic water inrush risk period includes a local fissure flushing and expansion period and a local channel formation period; the preset microseismic water inrush risk period warning condition includes a local fissure flushing and expansion period warning condition and a local channel formation period warning condition.

[0016] The local fissure flushing and expansion period warning condition includes that there are less than a first preset proportion of microseismic events in the deep flow field, the number of microseismic events in the middle and shallow part increases in proportion to time, and the microseismic events in the middle and shallow part and the microseismic events in the deep flow field appear through-type aggregation.

[0017] The local channel formation period warning condition includes that there are more than a second preset proportion of microseismic events in the deep flow field, and the number of microseismic events in the middle and shallow part first increases and then decreases; the second preset proportion is greater than the first preset proportion.

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

[0019] Based on the local fissure flushing and expansion period warning condition and / or the local channel formation period warning condition, the typical water movement microseismic event set is analyzed to determine whether there is a water inrush risk period.

[0020] In a possible implementation, the local fissure flushing and expansion period warning condition and the local channel formation period warning condition are both determined based on a pre-constructed microseismic two-stage warning model, the microseismic two-stage warning model includes a local fissure flushing and expansion period, a local channel formation period and a water outflow period, and the microseismic two-stage warning model is determined based on the profile of the region to be monitored and the development and penetration of the vertical water conducting channel.

[0021] In one possible implementation, the preset stratum is the shallow-middle stratum of the coal seam floor;

[0022] A planar analysis was performed on the first set of microseismic events to determine the water inrush hazard index for each location indicated by all microseismic events in the first set of microseismic events, including:

[0023] Based on the elevation of the target microseismic event, the elevation of the stope floor, and the elevation of the highest point microseismic event within the stratum, the water inrush hazard index of all target microseismic events in the first microseismic event set is determined; where the target microseismic event is any microseismic event in the first microseismic event set.

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

[0025]

[0026] Among them, Z wi (x i ,y i Z represents the elevation of the target microseismic event. m (x,y) represents the elevation of the mining floor corresponding to the target microseismic event, Z. g H represents the elevation of the highest point of the microseismic event within the layer. s H represents the elevation difference between the coal seam floor and the target microseismic event. p Z represents the elevation difference between the target microseismic event at the highest point within the stratigraphic level and the elevation of the stope floor. wj (xj, yj) represents the elevation of the target microseismic event with the highest elevation in the first microseismic event set, Z. mx (x,y) represents the elevation at any point when the bottom plate of the mining area is inclined.

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

[0028] Based on the water inrush hazard index of each location indicated by all microseismic events in the first microseismic event set, contour lines of the water inrush hazard index are drawn on the plan view of the area to be monitored.

[0029] The location with the highest value on the contour map of the water inrush hazard index is identified as the water inrush hazard zone.

[0030] Secondly, embodiments of the present invention provide a micro-seismic early warning device for water hazards in pressurized coal mines, comprising:

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

[0032] The filtering module is used to filter out a set of typical water motion microseismic events based on the P-wave and S-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 preset early warning conditions for microseismic water inrush danger periods, and to determine whether there are any water inrush danger periods.

[0034] The second determination module is used to perform planar analysis on the first microseismic event set when a period of water inrush danger is determined, and 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 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 map of the area to be monitored, and to issue early warnings for the water inrush hazard period and water inrush hazard area.

[0036] Thirdly, embodiments of the present invention provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method as described in the first aspect or any possible implementation of the first aspect.

[0037] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method as described in the first aspect or any possible implementation thereof.

[0038] This invention provides a method, device, equipment, and storage medium for early warning of water hazards in pressurized coal mines using microseismic monitoring technology. To improve the real-time performance of the warning, microseismic monitoring technology is employed. First, a set of microseismic events in the area to be monitored is acquired. Then, based on the analysis of the P-wave and S-wave time differences and waveform rise times of all microseismic events, a set of typical water-movement microseismic events is selected. Next, based on preset early warning conditions for water inrush danger periods, the typical water-movement microseismic event set is analyzed to determine whether a water inrush danger period exists. When a water inrush danger period is determined, a planar analysis of the first set of microseismic events is performed to determine the water inrush danger index for each location indicated by all microseismic events in the first set. Finally, based on the water inrush danger index for each location indicated by all microseismic events in the first set and a planar map of the area to be monitored, a water inrush danger zone is determined, and early warnings for water inrush danger periods and zones are issued. This invention determines the dangerous periods of water inrush by performing vertical analysis on microseismic events over multiple time periods. After determining the dangerous periods of water inrush, it further determines the dangerous areas of water inrush through planar analysis, thus realizing two-way analysis and enabling real-time, scientific, and accurate two-way early warning of coal mine water hazards. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a flowchart illustrating the implementation of the microseismic early warning method for water hazards in pressurized coal mines provided in this embodiment of the invention.

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

[0042] Figure 3 This is a schematic diagram of the structure of the micro-seismic early warning device for water hazards in pressurized coal mines provided in an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0044] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0045] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0046] Microseismic monitoring technology is a new geophysical exploration technique that has developed in recent years. The basic principle of microseismic monitoring is to collect and acquire seismic wave signals emitted by rock fracturing or rock breaking through sensors. High-sensitivity geophones, pre-installed underground in coal mines, monitor and receive the minute vibration signals generated by rock fracturing. Specialized software decodes this information into valid microseismic signals, which are then analyzed based on the time, location, frequency, and energy of the microseismic events. Because microseismic geophones possess "remote sensing" capabilities, they can capture minute vibration signals within the surrounding space. Therefore, this non-contact monitoring method has advantages such as a large monitoring range, full-space monitoring, and high timeliness, effectively solving problems related to full-space, real-time, continuous monitoring and early warning of coal mine water inrush.

[0047] To address the problems of existing technologies, embodiments of the present invention provide a method, apparatus, equipment, and storage medium for early warning of water hazards in pressurized coal mines. The method for early warning of water hazards in pressurized coal mines provided by the embodiments of the present invention will be described first.

[0048] See Figure 1 The document illustrates a flowchart of the implementation of the microseismic early warning method for water hazards in pressurized coal mines provided in this embodiment of the invention, detailed below:

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

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

[0051] To obtain microseismic events over multiple time periods, a microseismic monitoring system needs to be constructed within the monitoring area. The monitoring range of the system should cover the entire area affected by mining operations and the range affected by mining stress, as well as some areas of original rock stress, in a horizontal plane. Vertically, it should cover the bending subsidence zone of the roof all the way to the deep parts of the main water-rich aquifers of the bottom.

[0052] S120. Based on the P-wave and S-wave time differences and waveform rise times of all microseismic events, a set of typical water motion microseismic events is obtained by screening.

[0053] Each microseismic event contains many attributes. To improve the accuracy of early warning and reduce the amount of data to be processed, a set of typical water motion microseismic events can be obtained by filtering the P-wave and S-wave time differences and waveform rise times of all microseismic events. By analyzing the microseismic events in the set of typical water motion microseismic events, the difficulty of data processing is reduced and the processing speed is improved.

[0054] In some embodiments, all microseismic events can be screened based on clustering methods.

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

[0056] Then, cluster analysis was performed on the waveform rise times of the second microseismic event set to screen out a set of typical water-movement microseismic events. Among them, the set of typical water-movement microseismic events is the set of events with the longest waveform rise times in the second microseismic event set.

[0057] Specifically, systematic clustering is performed on the P-wave and S-wave time differences of all microseismic events, and the cluster with the smallest P-wave and S-wave time difference values ​​is selected to form the second microseismic event set B. Then, systematic clustering is performed on the waveform rise time in the second microseismic event set B, and the cluster with the largest waveform rise time is selected to form the typical water motion microseismic event set C. After two systematic clustering screenings, the resulting set is the typical water motion microseismic event set C.

[0058] In some embodiments, all microseismic events can be screened based on classification algorithms such as C4.5 and SVM, which are also based on the P-wave and S-wave time difference and waveform rise time, and will not be elaborated here.

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

[0060] In some embodiments, in order to accurately provide time-based early warnings, the inventors considered the development process of the vertical channel through vertical analysis and constructed a two-stage early warning model for microseismic events through analysis. For example... Figure 2As shown, the two-stage microseismic early warning model includes the local fracture diffusion stage, the local channel formation stage, and the water emergence stage. This model is determined based on the profile of the monitored area and the development and connectivity of vertical water-conducting channels. First, the appearance of microseismic events in the deep flow field indicates flow field disturbance and the presence of a water inrush dynamic. Then, microseismic events in the shallow and intermediate layers gradually increase, reflecting fracture development. When the number of microseismic events reaches a certain level, the fractures are sufficiently developed and will connect. This connection, or connectivity, occurs during the local channel formation stage. Subsequently, under the influence of water pressure, the fractures become increasingly smooth water-conducting channels, during which the number of microseismic events actually decreases. Finally, a large amount of water from the aquifer reaches the mining space, marking the water emergence stage. Figure 2 The applicable condition is that microseismic events continuously occur in the deep flow field. Figure 2 The described stages include: during the local fissure expansion stage, the risk of water outflow increases; during the local channel formation stage, water outflow is imminent; and after the local channel is formed, the water inrush stage begins.

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

[0062] The early warning conditions for the local fracture expansion period include: the presence of microseismic events in the deep flow field at a rate less than the first preset proportion; the number of microseismic events in the shallow and medium-depth flow field increases proportionally with time; and the microseismic events in the shallow and medium-depth flow field and the microseismic events in the deep flow field exhibit a continuous clustering.

[0063] The presence of microseismic events in the deep flow field at a rate less than a first preset proportion indicates a relatively small number of microseismic events occurring in the deep flow field. This first preset proportion can be the ratio of the number of microseismic events occurring in the deep flow field to the total number of microseismic events in the typical water motion microseismic event set. Alternatively, it can be the ratio of the number of microseismic events occurring in the deep flow field to the total number of microseismic events occurring in the shallow and intermediate flow fields; this is not a limitation here. The proportional increase in the number of microseismic events in the shallow and intermediate flow fields over time indicates that the number of microseismic events in the shallow and intermediate flow fields has undergone a process of change from few to many and is still increasing. The interconnected clustering of microseismic events in the shallow and intermediate flow fields and the deep flow field indicates that the water-conducting channels in the shallow and intermediate flow fields and the deep flow field are connected. The peak number of microseismic events may coincide with or lag behind the time of connection.

[0064] When all three conditions are met simultaneously—the presence of microseismic events in the deep flow field being less than a first preset proportion, the number of microseismic events in the shallow and medium-depth flow field increasing proportionally with time, and the microseismic events in the shallow and medium-depth flow field and the microseismic events in the deep flow field exhibiting a continuous accumulation—the early warning conditions for the local fracture expansion period can be determined to be met.

[0065] The early warning conditions for the formation of local channels include: the presence of microseismic events in the deep flow field exceeding a second preset proportion, and the number of microseismic events in the shallow and mid-depth regions first increasing and then decreasing. The second preset proportion is greater than the first preset proportion, and the calculation method for the second preset proportion is the same as that for the first preset proportion, so it will not be repeated here.

[0066] Among them, the presence of microseismic events in the deep flow field exceeding the second preset proportion means that microseismic events continuously exist in the deep flow field. The number of microseismic events in the middle and shallow regions first increases and then decreases means that the number of microseismic events in the middle and shallow regions has undergone a process of decrease after the connection, with an overall increase and decrease, a clear peak, and a post-peak stage.

[0067] The disturbance of the deep flow field is the fundamental cause of the development of vertical channels, providing the initial driving force for their development. Therefore, the presence of microseismic events in the deep flow field exceeding a second preset proportion, meaning the continuous presence of microseismic events in the deep flow field, is the first condition for vertical channel determination. Only when both conditions are met simultaneously—the presence of microseismic events in the deep flow field exceeding a second preset proportion and the number of microseismic events in the shallow and mid-depth regions first increasing and then decreasing—can the early warning conditions for the formation period of local channels be determined.

[0068] Water inrush warning can be issued when the three conditions for early warning during the local fracture expansion period and / or the two conditions for early warning during the local channel formation period are met simultaneously.

[0069] It should be noted that the deep flow field refers to the water-rich aquifer, while the shallow-medium flow field refers to the intermediate region above the deep flow field below the mining area.

[0070] S140. When a period of water inrush risk is identified, perform a planar analysis on the first set of microseismic events to determine the water inrush risk index of each location indicated by all microseismic events in the first set of microseismic events.

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

[0072] Only after the period of potential water inrush is identified can a planar analysis be conducted to determine the area at risk of water inrush.

[0073] In some embodiments, the water inrush hazard index for 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 point microseismic event within the stratum. Here, the target microseismic event is any microseismic event in the first microseismic event set.

[0074] Let the elevation of the i-th microseismic event be Z. wi (x i ,y i Each microseismic event corresponds to an elevation Z. w Each microseismic event corresponds to a fixed (x, y) coordinate. The elevation Z of the stope floor is... m (x,y), the elevation Z of the highest point of the microseismic event within the layer. g The elevation Z of the stope floor. m Let Z be a function of the plane position (x, y) of the base plate. The elevation Z of the microseismic event at the highest point within the story level. g It is a fixed value, meaning there is only one highest point over a period of time, corresponding to the elevation Z of the microseismic event at that single highest point. g .

[0075] If there are no microseismic events above the floor elevation of the mining area (which is more likely to occur in near-horizontal coal seams), then the elevation difference H between the coal seam floor elevation and the elevation of the microseismic event at that location is... s =Z m (x,y)-Z wi (x i ,y i Elevation difference H s This represents the actual distance between the water body and the bottom of the coal seam. The smaller the distance, the more dangerous it is, with the smallest distance indicating a high risk of water inrush.

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

[0077] If the elevation of the highest microseismic event exceeds the floor elevation of a certain point in the mining area (which is more likely to occur in inclined coal seams), and microseismic events occur at that location and within that stratum, then that location is a water inrush hazard area. If several such locations exist simultaneously (or the area is large), the degree of water inrush hazard can be evaluated using the following methods.

[0078] Set the elevation difference H between the highest microseismic event elevation within the stratigraphic level and the bottom elevation of the mining area. 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 )]. T w The larger the area, the more dangerous it is.

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

[0080]

[0081] Among them, Z wi (x i ,y i Z represents the elevation of the target microseismic event. m (x,y) represents the elevation of the mining floor corresponding to the target microseismic event, Z. g H represents the elevation of the highest point of the microseismic event within the layer. s H represents the elevation difference between the coal seam floor and the target microseismic event. p Z represents the elevation difference between the target microseismic event at the highest point within the stratigraphic level and the elevation of the stope floor. wj (xj, yj) represents the elevation of the target microseismic event with the highest elevation in the first microseismic event set, Z. mx (x, y) represents the elevation at any point when the floor of the mining area is inclined. Z wj (x j ,y j )>Z mx (x,y) means that there exists a microseismic event with an elevation greater than the elevation of at least one base plate. Z m (x,y)>Z wi (x i ,y i This means that for all microseismic events, their elevations are all lower than the elevation of the base plate 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 early warnings for the water inrush hazard period and water inrush hazard area.

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

[0084] This invention provides a microseismic early warning method for water hazards in pressurized coal mines. To improve the accuracy of the early warning, microseismic monitoring technology is employed. First, a set of microseismic events in the area to be monitored is acquired. Then, based on the analysis of the P-wave and S-wave time differences and waveform rise times of all microseismic events, a set of typical water-movement microseismic events is selected. Next, based on preset early warning conditions for water inrush danger periods, the typical water-movement microseismic event set is analyzed to determine whether a water inrush danger period exists. When a water inrush danger period is determined, a planar analysis of the first set of microseismic events is also performed to determine the water inrush danger index at each location indicated by all microseismic events in the first set. Finally, based on the water inrush danger index at each location indicated by all microseismic events in the first set and the planar map of the area to be monitored, water inrush danger zones are determined, and early warnings for water inrush danger periods and zones are issued. This invention determines the dangerous periods of water inrush by performing vertical analysis on microseismic events over multiple time periods. After determining the dangerous periods of water inrush, it further determines the dangerous areas of water inrush through planar analysis, thus realizing two-way analysis and enabling real-time, scientific, and accurate two-way early warning of coal mine water hazards.

[0085] It should be understood that the sequence number of each step in the above embodiments does not imply 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 embodiments of the present invention.

[0086] Based on the microseismic early warning method for water hazards in pressurized coal mines provided in the above embodiments, the present invention also provides a specific implementation of a microseismic early warning device for water hazards in pressurized coal mines applied to this method. Please refer to the following embodiments.

[0087] like Figure 3 As shown, a micro-seismic early warning device 300 for water hazards in pressurized coal mines is provided. The device includes:

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

[0089] The filtering module 320 is used to filter out a set of typical water motion microseismic events based on the P-wave and S-wave time differences and waveform rise times of all microseismic events.

[0090] The first determining module 330 is used to analyze a set of typical water movement microseismic events based on preset early warning conditions for microseismic water inrush danger periods, and to determine whether there is a water inrush danger period.

[0091] The second determining module 340 is used to perform planar analysis on the first microseismic event set when it is determined that there is a period of water inrush danger, and 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 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 one possible implementation, the filtering module 320 is used to perform systematic cluster analysis on the P-wave and S-wave time differences of all microseismic events to filter and obtain a second set of microseismic events; wherein, the second set of microseismic events is the set of events with the smallest P-wave and S-wave time difference values;

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

[0095] In one possible implementation, the dangerous period of microseismic water inrush includes the local fracture erosion and expansion period and the local channel formation period; the preset early warning conditions for the dangerous period of microseismic water inrush include: early warning conditions for the local fracture erosion and expansion period and early warning conditions for the local channel formation period;

[0096] The early warning conditions for the local fracture expansion period include: the presence of microseismic events in the deep flow field that are less than the first preset proportion, the number of microseismic events in the middle and shallow parts increasing proportionally with time, and the microseismic events in the middle and shallow parts and the microseismic events in the deep flow field showing a through-type clustering.

[0097] The early warning conditions during the formation period of local channels include: the presence of microseismic events in the deep flow field exceeding the second preset proportion, and the number of microseismic events in the middle and shallow parts first increasing and then decreasing; wherein, the second preset proportion is greater than the first preset proportion;

[0098] The first determining module 330 is used to analyze a typical set of 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 early warning conditions for the local fracture scour and expansion period and the local channel formation period are both determined based on a pre-constructed two-stage microseismic early warning model. The two-stage microseismic early warning model includes the local fracture scour and expansion period, the local channel formation period, and the water outflow period. The two-stage microseismic early warning model is determined based on the profile of the area to be monitored and the development and connection of the vertical water-guiding channel.

[0100] In one possible implementation, the preset stratum is the shallow-middle stratum of the coal seam floor;

[0101] The second determining 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 stope floor, and the elevation of the highest point microseismic event within the stratum; wherein, the target microseismic event is any microseismic event in the first microseismic event set.

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

[0103]

[0104] Among them, Z wi (x i ,y i Z represents the elevation of the target microseismic event. m (x,y) represents the elevation of the mining floor corresponding to the target microseismic event, Z. g H represents the elevation of the highest point of the microseismic event within the layer. s H represents the elevation difference between the coal seam floor and the target microseismic event. p Z represents the elevation difference between the target microseismic event at the highest point within the stratigraphic level and the elevation of the stope floor. wj (xj, yj) represents the elevation of the target microseismic event with the highest elevation in the first microseismic event set, Z. mx (x,y) represents the elevation at any point when the bottom plate of the mining area is inclined.

[0105] In one possible implementation, the early warning module 350 is used to generate contour lines of the water inrush hazard index on the plan view 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.

[0106] The location with the highest value on the contour map of the water inrush hazard index is identified as the water inrush hazard zone.

[0107] Figure 4 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Figure 4 As shown, the electronic device 4 in 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, it implements the steps in the above embodiments of the micro-seismic early warning method for water hazards in pressurized coal mines, for example... Figure 1Steps 110 to 150 are shown. Alternatively, when the processor 40 executes the computer program 42, it implements the functions of each module in the above-described device embodiments, for example... Figure 3 The functions of modules 310 to 350 are shown.

[0108] For example, the computer program 42 can be divided into one or more modules, which are stored in the memory 41 and executed by the processor 40 to complete the present invention. The one or more modules can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program 42 in the electronic device 4. For example, the computer program 42 can 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 understand that... Figure 4 This is merely an example of electronic device 4 and does not constitute a limitation on electronic device 4. It may include more or fewer components than shown, or combine certain components, or different components. For example, the electronic device may also include input / 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 (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), 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.

[0111] The memory 41 can be an internal storage unit of the electronic device 4, such as a hard disk or memory. The memory 41 can also be an external storage device of the electronic device 4, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory 41 can include both internal and external storage units 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 can also be used to temporarily store data that has been output or will be output.

[0112] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to 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 embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0113] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0114] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0115] In the embodiments provided by this 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 merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

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

[0117] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0118] If the integrated module / unit is implemented as 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, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the above embodiments of the micro-seismic early warning method for water hazards in pressurized coal mines. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0119] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for early warning of water hazards in pressurized coal mines using microseismic seismic technology, characterized in that, include: Obtain a set of microseismic events for the area to be monitored, wherein the set of microseismic events includes microseismic events within multiple time periods; Based on the P-wave and S-wave time differences and waveform rise times of all the microseismic events, a set of typical water motion microseismic events was obtained. Based on the preset early warning conditions for the dangerous period of microseismic water inrush, the typical set of water movement microseismic events is analyzed to determine whether there is a dangerous period of water inrush. When a period of water inrush risk is identified, the water inrush risk index is determined for 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 stope floor, and the elevation of the highest point microseismic event within the stratum. The target microseismic event is any microseismic event in the first microseismic event set, and the first microseismic event set is a microseismic event at a preset stratum within the typical water movement microseismic event set, where the preset stratum is a shallow to medium-depth stratum of the coal seam floor. 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, water inrush hazard areas are determined, and warnings are issued for water inrush hazard periods and water inrush hazard areas. The dangerous periods of microseismic water inrush include the local fracture erosion and expansion period and the local channel formation period. The preset early warning conditions for these periods include: early warning conditions for the local fracture erosion and expansion period and early warning conditions for the local channel formation period. The early warning conditions for the local fracture erosion and expansion period include: the presence of microseismic events in the deep flow field at a rate less than a first preset proportion; the number of microseismic events in the shallow and intermediate flow fields increases proportionally with time; and the microseismic events in the shallow and intermediate flow fields and the microseismic events in the deep flow field exhibit a continuous clustering. The early warning conditions for the local channel formation period include: the presence of microseismic events in the deep flow field at a rate greater than a second preset proportion; the number of microseismic events in the shallow and intermediate flow fields first increases and then decreases; the second preset proportion is greater than the first preset proportion. The analysis of the typical water movement microseismic event set based on the preset early warning conditions for the dangerous period of water inrush, to determine whether there is a dangerous period of water inrush, specifically includes: Based on the early warning conditions for the local fracture expansion period and / or the early warning conditions for 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.

2. The microseismic early warning method for water hazards in pressurized coal mines as described in claim 1, characterized in that, Based on the P-wave and S-wave time differences and waveform rise times of all the aforementioned microseismic events, a set of typical water motion microseismic events is obtained through screening, including: Systematic cluster analysis was performed on the P-wave and S-wave transit times of all the microseismic events to obtain a second set of microseismic events; wherein, the second set of microseismic events is the set of events with the smallest P-wave and S-wave transit time differences; Systematic cluster analysis was performed on the waveform rise time of the second microseismic event set to screen out a set of typical water motion microseismic events; wherein, the set of typical water motion microseismic events is the set of events with the largest waveform rise time in the second microseismic event set.

3. The microseismic early warning method for water hazards in pressurized coal mines as described in claim 1, characterized in that, The early warning conditions for the local fracture scour and expansion period and the local channel formation period are both determined based on a pre-constructed two-stage microseismic early warning model. The two-stage microseismic early warning model includes the local fracture scour and expansion period, the local channel formation period, and the water outflow period. The two-stage microseismic early warning model is determined based on the profile of the area to be monitored and the development and connection of the vertical water-guiding channels.

4. The microseismic early warning method for water hazards in pressurized coal mines as described in claim 1, characterized in that, The water inrush hazard index T of the target microseismic event w for: Among them, Z wi (x) i ,y i Z represents the elevation of the target microseismic event. m (x, y) represents the elevation of the stope floor corresponding to the target microseismic event, Z g H represents the elevation of the highest point of the microseismic event within the layer. s H represents the elevation difference between the coal seam floor and the target microseismic event. p Z represents the elevation difference between the target microseismic event at the highest point within the stratigraphic level and the elevation of the stope floor. wj (x) j ,y j Z represents the elevation of the target microseismic event with the highest elevation in the first set of microseismic events. mx (x, y) represents the elevation at any point when the bottom plate of the mining area is inclined.

5. The microseismic early warning method for water hazards in pressurized coal mines as described in any one of claims 1-4, characterized in that, The determination of water inrush hazard areas 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 location indicated by all microseismic events in the first microseismic event set, a contour map of the water inrush hazard index of the monitored area is generated based on the plan map of the monitored area. The location with the highest value on the contour map of the water inrush hazard index is determined as the water inrush hazard area.

6. A micro-seismic early warning device for water hazards in pressurized coal mines, characterized in that, include: The acquisition module is used to acquire a set of microseismic events in the area to be monitored, wherein the set of microseismic events includes microseismic events within multiple time periods; The filtering module is used to filter out a set of typical water motion microseismic events based on the P-wave and S-wave time differences and waveform rise times of all the microseismic events. The first determining module is used to analyze the set of typical water movement microseismic events based on preset early warning conditions for microseismic water inrush danger periods, and to determine whether there is a water inrush danger period. The second determining module is used to determine the water inrush hazard index of each location indicated by all target microseismic events in the first microseismic event set when a water inrush hazard period is determined, based on the elevation of the target microseismic event, the elevation of the stope floor, and the elevation of the highest point microseismic event within the stratum; wherein, the target microseismic event is any microseismic event in the first microseismic event set; the first microseismic event set is a microseismic event of a preset stratum in the typical water movement microseismic event set, and the preset stratum is a stratum in the middle and shallow part of the coal seam floor; 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 the water inrush hazard period and water inrush hazard area. The dangerous periods of microseismic water inrush include the local fracture erosion and expansion period and the local channel formation period. The preset early warning conditions for these periods include: early warning conditions for the local fracture erosion and expansion period and early warning conditions for the local channel formation period. The early warning conditions for the local fracture erosion and expansion period include: the presence of microseismic events in the deep flow field at a rate less than a first preset proportion; the number of microseismic events in the shallow and intermediate flow fields increases proportionally with time; and the microseismic events in the shallow and intermediate flow fields and the microseismic events in the deep flow field exhibit a continuous clustering. The early warning conditions for the local channel formation period include: the presence of microseismic events in the deep flow field at a rate greater than a second preset proportion; the number of microseismic events in the shallow and intermediate flow fields first increases and then decreases; the second preset proportion is greater than the first preset proportion. The first determining module is specifically used to analyze the 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.

7. An electronic device, characterized in that, The method includes a memory and a processor, the memory being used to store a computer program, and the processor being used to call and run the computer program stored in the memory to perform the method as described in any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 5.

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