Methods, devices, electronic equipment and storage media for determining the height of overburden failure

Abstract

This application provides a method, apparatus, electronic device, and storage medium for determining the height of overburden failure. The method includes: acquiring the location and energy values ​​of microseismic events through multiple microseismic monitoring stations arranged underground and on the surface; determining a first target range based on the expected development height of the water-conducting fracture zone in the working face, the rock strata movement angle, and the location of the mining roadway; converting each microseismic event in the first target range into a basic microseismic event according to the ratio of the energy value of each microseismic event in the first target range to a set value; selecting a second target range based on the expected development height, and determining a tracking radius based on the ultimate span of the roof in the second target range; searching within the first target range according to a set direction and tracking radius, determining the core point of the microseismic event based on the number of basic microseismic events within the tracking radius, and determining the overburden failure height based on the coordinates of the highest point among the core points.

Description

Technical Field

[0001] This application relates to the field of geological exploration technology, and in particular to a method, apparatus, electronic device and storage medium for determining the height of overburden damage. Background Technology

[0002] After coal seam mining, rock strata at different distances from the coal seam roof will undergo varying degrees of deformation, accompanied by the generation of numerous mining-induced fractures. When the coal and rock mass fails, microseismic events occur, which can be captured using seismic sensors.

[0003] Currently, methods for determining the height of overburden failure based on microseismic events are still in their early stages. Most methods rely on the probability of microseismic events occurring within a certain range to determine the height, such as using the proportion of microseismic events occurring at different strata. However, mining-induced overburden failure exhibits a certain degree of continuity; the fracture zones formed by overburden failure often intersect, and the resulting microseismic events are interconnected, leading to low accuracy in predicting the height of overburden failure. Summary of the Invention

[0004] To address the aforementioned problems in related technologies, this application provides a method, apparatus, electronic device, and storage medium for determining the height of overburden failure.

[0005] In a first aspect, this application provides a method for determining the height of overburden failure, including:

[0006] The location and energy values ​​of microseismic events are obtained through multiple microseismic monitoring stations deployed both underground and on the surface.

[0007] The first target range is determined based on the expected development height of the water-conducting fracture zone in the working face, the rock strata movement angle, and the location of the mining roadway;

[0008] Based on the ratio of the energy value of each microseismic event within the first target range to a set value, each microseismic event within the first target range is converted into a basic microseismic event according to the corresponding ratio.

[0009] The second target range is selected based on the expected development height, and the tracking radius is determined based on the limit span of the top plate within the second target range;

[0010] Within the first target range, a search is performed according to the set direction and the tracking radius. The core point of the microseismic event is determined based on the number of basic microseismic events within the tracking radius. The overburden failure height is determined based on the coordinates of the highest point among the core points.

[0011] Optionally, determining the first target range based on the expected development height of the water-conducting fracture zone at the working face, the strata movement angle, and the location of the mining roadway includes:

[0012] Based on the mechanical parameters of the overlying strata, the expected development height of the water-conducting fracture zone in the working face is determined;

[0013] The displacement angle of the overlying strata is determined based on the type of overlying strata;

[0014] The expansion range of the mining roadway is determined based on the predicted development height (set multiple) and the cotangent value of the rock strata movement angle.

[0015] The first target range is determined based on the location of the mining roadway and the expansion range.

[0016] Optionally, the set value is determined based on the following steps:

[0017] The microseismic events within the first target range are sorted according to their energy values, and the energy values ​​that meet the set conditions are taken as the set values. The microseismic events corresponding to the set values ​​are taken as the basic microseismic events.

[0018] Optionally, determining the tracking radius based on the limit span of the top plate within the second target range includes:

[0019] Based on the lithology, uniaxial tensile strength, rock layer thickness, burial depth, and unit weight of the top plate within the second target range, determine the ultimate span of the top plate within the second target range;

[0020] The maximum value of the limit span is determined to be the tracking radius.

[0021] Optionally, the determination of the ultimate span of the top plate within the second target range satisfies the following calculation formula:

[0022] L = 4hR T / (3γH)

[0023] Where L represents the ultimate span in meters; h represents the rock stratum thickness in meters; R T γ represents uniaxial tensile strength in Pascals; γ represents unit weight in Newtons per cubic meter; H represents burial depth in meters.

[0024] Optionally, determining the core point of a microseismic event based on the number of basic microseismic events within the tracking radius includes:

[0025] When the number of basic microseismic events within the tracking radius exceeds a preset threshold, the effective area and effective points are determined.

[0026] The core point is determined by identifying the valid point that is always within the valid area within the preset range.

[0027] Optionally, the set direction includes the working face advancing direction and / or the working face tilting direction.

[0028] Secondly, this application also provides a device for determining the height of overburden failure, comprising:

[0029] The acquisition module is used to acquire the location and energy values ​​of microseismic events through multiple microseismic monitoring stations deployed downhole and on the surface;

[0030] The first determining module is used to determine the first target range based on the expected development height of the water-conducting fracture zone in the working face, the rock strata movement angle, and the location of the mining roadway;

[0031] The conversion module is used to convert each microseismic event within the first target range into a basic microseismic event according to the ratio of the energy value of each microseismic event within the first target range to a set value.

[0032] The second determining module is used to select a second target range based on the expected development height, and to determine the tracking radius based on the limit span of the top plate within the second target range;

[0033] The third determining module is used to search within the first target range according to a set direction and the tracking radius, determine the core point of the microseismic event based on the number of basic microseismic events within the tracking radius, and determine the overburden failure height based on the coordinates of the highest point among the core points.

[0034] Thirdly, this application also provides 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 program to implement the overburden failure height determination method as described in the first aspect.

[0035] Fourthly, this application also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the overburden failure height determination method as described in the first aspect.

[0036] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the overburden failure height determination method described in the first aspect above.

[0037] The overburden failure height determination method, device, electronic equipment, and storage medium provided in this application acquire the location and energy magnitude of microseismic events through multiple microseismic monitoring stations deployed underground and on the surface. Based on the expected development height of the water-conducting fracture zone in the working face and the rock strata movement angle, the range of possible microseismic events outward from the mining roadway is expanded to determine a first target range. Within the first target range, considering the energy magnitude of microseismic events, all microseismic events are converted into basic microseismic events. At the same time, the rock strata fracture is considered to determine the tracking radius. Within the first target range, a search is conducted according to the tracking radius and a set direction. The density of basic microseismic events is considered to determine the core point, thereby determining the overburden failure height. From the perspective of microseismic event tracking, the density, energy magnitude, and continuity of microseismic events are comprehensively considered, improving the accuracy of overburden failure height determination. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is one of the flowcharts illustrating the method for determining the height of overburden failure provided in the embodiments of this application;

[0040] Figure 2 This is a schematic diagram showing the distribution of surface and underground microseismic monitoring stations provided in an embodiment of this application;

[0041] Figure 3 This is a schematic diagram showing the distribution of the planar range of microseismic events provided in an embodiment of this application;

[0042] Figure 4 This is a schematic diagram illustrating the determination of the core point of a microseismic event according to an embodiment of this application;

[0043] Figure 5 This is a schematic diagram of the overburden failure height determination device provided in the embodiments of this application;

[0044] Figure 6 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0045] To better describe the technical solutions in the embodiments of this application, relevant knowledge is introduced below.

[0046] Coal mining disrupts the stability and integrity of the original strata, causing discontinuous or continuous deformation of the overlying strata or the floor strata of the coal seam, accompanied by the formation of cracks of varying degrees. When these cracks connect to aquifers or toxic gases, they may enter the mining area, increasing the safety risks to mine production. Overlying strata failure is one of the contributing factors to coal mine disasters, and the height of overlying strata failure is a key parameter for determining whether a water hazard from the roof of a coal mine will occur.

[0047] Currently, the determination of the overburden failure height in coal mines mainly relies on methods such as borehole leakage measurement, fiber optic detection, and analogy. However, these methods have the following drawbacks:

[0048] (1) Primarily based on point-based monitoring

[0049] Currently, monitoring of overburden failure height is mainly based on local monitoring. The monitoring data is only available during the observation period, and it is difficult to obtain effective data when no observation is carried out. In particular, borehole fluid loss monitoring can only observe the degree of formation fracture development during borehole construction, and it is difficult to effectively monitor fracture development before and after borehole construction.

[0050] (2) The correlation between microseismic events was not considered.

[0051] Current methods for predicting overburden failure height based on microseismic events primarily rely on the proportion of microseismic events occurring at different strata to avoid the influence of some discrete microseismic events on the prediction results. However, in actual production processes, the crack zones formed by overburden failure are often interpenetrating cracks, which generally generate associated microseismic events. Existing methods for predicting overburden failure height based on microseismic events do not fundamentally consider the relationship between microseismic events and overburden failure, resulting in low prediction accuracy for overburden failure height.

[0052] With the development of microseismic monitoring technology, current microseismic monitoring can achieve full-area and full-process monitoring of overburden damage height, and is gradually becoming an important means of monitoring overburden damage height in coal mines.

[0053] To address the aforementioned problems in related technologies, this application proposes a method, apparatus, electronic device, and storage medium for determining the height of overburden failure. From the perspective of microseismic event tracking, it comprehensively considers the density, energy magnitude, and continuity of microseismic events. By employing microseismic event tracking technology, it uses the density of microseismic events occurring in a small local area as a benchmark, or converts local high-energy events into energy density, to obtain the height of overburden failure, thereby achieving a scientific assessment of the height of overburden failure.

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] Figure 1 This is a flowchart illustrating the method for determining the overburden failure height provided in an embodiment of this application, as shown below. Figure 1 As shown, the method includes at least the following steps:

[0056] Step 101: Obtain the location and energy values ​​of microseismic events through multiple microseismic monitoring stations deployed underground and on the surface.

[0057] Specifically, after coal seam mining, rock strata at different distances from the roof of the coal seam will undergo varying degrees of deformation. Areas with severe deformation may move, deform, or even break and rotate. During the deformation and failure process of the coal and rock mass, the internal capacity of cracks to generate, propagate, and rub against each other is released through the travel of gravitational waves, producing microseismic events.

[0058] Mining-induced overburden failure is a periodic fracturing phenomenon of the roof as the coal seam is mined, exhibiting a certain degree of continuity. By deploying multiple microseismic monitoring stations both underground and on the surface, a joint underground and surface microseismic monitoring network can be constructed. This network allows for timely monitoring and acquisition of microseismic events. Based on the waveforms of these events, their location and energy magnitude can be determined. The number of microseismic monitoring stations can be determined based on the size of the working face; for example, 4-6 stations can be deployed underground, and 2-3 stations can be deployed on the surface.

[0059] Figure 2 This is a schematic diagram showing the distribution of surface and underground microseismic monitoring stations provided in the embodiments of this application, as shown below. Figure 2 As shown, four microseismic monitoring stations are deployed underground and two are deployed on the surface. A spatial rectangular coordinate system O-xyz is constructed, with the working face advance direction as the x-axis, the working face dip direction as the y-axis, and the vertical direction of coal seam overburden as the z-axis. By combining the waveforms of microseismic events, the coordinates and energy of the microseismic events can be located.

[0060] Step 102: Determine the first target range based on the expected development height of the water-conducting fracture zone in the working face, the rock strata movement angle, and the location of the mining roadway.

[0061] Specifically, statistically analyzing and calculating all microseismic events would increase computational complexity; conversely, using only the area between mining roadways as the statistical scope for microseismic events would result in the loss of much data, affecting the accuracy of overburden failure height prediction. Therefore, it is necessary to filter the statistically analyzed microseismic event data.

[0062] In actual production, numerous microseismic events occur near the mining roadways. Based on the rock strata movement angle and the predicted development height of the water-conducting fracture zone at the working face, the area extending outward from the mining roadway where microseismic events need to be statistically analyzed can be determined. Combining this range with the location of the mining roadway, a first target range for microseismic event analysis is established, and microseismic events within this first target range are considered valid microseismic events.

[0063] Step 103: Based on the ratio of the energy value of each microseismic event within the first target range to the set value, convert each microseismic event within the first target range into a basic microseismic event according to the corresponding ratio.

[0064] Specifically, after determining the first target range, within this range, different microseismic events have different energy levels. The higher the energy of a microseismic event, the greater its overburden damage capacity. The contribution of microseismic events of different energy levels to determining the overburden damage height should be differentiated. Each microseismic event can be converted into a base microseismic event according to the ratio between its energy value and a set value. The set value, or the energy value of the base microseismic event, can be predefined or selected from the energy values ​​of various microseismic events during actual monitoring according to certain rules.

[0065] Step 104: Select a second target range based on the expected development height, and determine the tracking radius based on the limit span of the top plate within the second target range.

[0066] Specifically, it is necessary to further determine the tracking radius of the microseismic event. In this embodiment, the expected development height of the water-conducting fracture zone at the working face is used to select the second target range. Since the expected development height of the water-conducting fracture zone at the working face is not very precise, the range can be extended beyond the expected development height to select the rock strata within the second target range.

[0067] Then, the tracking radius is determined based on the maximum value of the limit span of the top plate within the second target range.

[0068] Step 105: Within the first target range, search according to the set direction and the tracking radius, determine the core point of the microseismic event based on the number of basic microseismic events within the tracking radius, and determine the overburden failure height based on the coordinates of the highest point among the core points.

[0069] Specifically, after determining the first target range and tracking radius of the statistical microseismic events, a search is conducted within the first target range according to the set direction and tracking radius. The core point of the microseismic events is determined based on the number of basic microseismic events within the tracking radius, and the coordinates of the highest point among the core points are taken as the overburden failure height.

[0070] The overburden failure height determination method provided in this application obtains the location and energy magnitude of microseismic events through multiple microseismic monitoring stations arranged underground and on the surface. Based on the expected development height of the water-conducting fracture zone in the working face and the rock strata movement angle, the range of possible microseismic events outward from the mining roadway is expanded to determine the first target range. Within the first target range, considering the energy magnitude of microseismic events, all microseismic events are converted into basic microseismic events. At the same time, the rock strata fracture is considered to determine the tracking radius. Within the first target range, a search is conducted according to the tracking radius and the set direction. The density of basic microseismic events is considered to determine the core point, thereby determining the overburden failure height. From the perspective of microseismic event tracking, the method comprehensively considers the density, energy magnitude, and continuity of microseismic events, thus improving the accuracy of overburden failure height determination.

[0071] Optionally, determining the first target range based on the expected development height of the water-conducting fracture zone at the working face, the strata movement angle, and the location of the mining roadway includes:

[0072] Based on the mechanical parameters of the overlying strata, the expected development height of the water-conducting fracture zone in the working face is determined;

[0073] The displacement angle of the overlying strata is determined based on the type of overlying strata;

[0074] The expansion range of the mining roadway is determined based on the predicted development height (set multiple) and the cotangent value of the rock strata movement angle.

[0075] The first target range is determined based on the location of the mining roadway and the expansion range.

[0076] Specifically, the expected development height of the water-conducting fracture zone at the working face is determined based on the mechanical parameters of the overlying strata, and the strata movement angle is determined based on the type of the overlying strata. The extension range of the mining roadway is determined based on the expected development height of the water-conducting fracture zone and the cotangent value of the strata movement angle, which are set as a multiple. Then, based on the location of the mining roadway and its corresponding extension range, the first target range for statistical microseismic events is determined. The set multiple can be selected as needed.

[0077] Figure 3 This is a schematic diagram showing the distribution of the planar range of microseismic events provided in the embodiments of this application, as shown below. Figure 3 As shown, the two mining roadways include a haulage roadway and a track roadway, and their locations are determined. The expected height of the water-conducting fracture zone at the working face is H.li The multiplier n is set to 1.5. Based on the type of overlying strata, the strata movement angle β is determined, and the expansion range l of the mining roadway is obtained as follows:

[0078] l = nH li cotβ

[0079] By combining the distance between the two mining roadways (working face width) and the expansion range of the mining roadways, the first target range of statistical microseismic events is determined from the perspective of rock strata movement.

[0080] The overburden failure height determination method provided in this application embodiment screens monitored microseismic events, determines the expansion range near the mining roadway based on the development height of the water-conducting fracture zone in the working face and the rock strata movement angle, and statistically analyzes some microseismic events that expand outward from the mining roadway, thereby improving the accuracy of overburden failure height determination.

[0081] Optionally, the set value is determined based on the following steps:

[0082] The microseismic events within the first target range are sorted according to their energy values, and the energy values ​​that meet the set conditions are taken as the set values. The microseismic events corresponding to the set values ​​are taken as the basic microseismic events.

[0083] Specifically, for microseismic events within the first target range, they are sorted in ascending or descending order of energy value, and the energy value that meets the set conditions is taken as the set value. For example, after sorting in ascending order from smallest to largest, the microseismic event at the 20th percentile of the energy level sequence is taken as the basic microseismic event, and the corresponding energy value U0 is taken as the set value.

[0084] Determine the energy magnitude U of the i-th microseismic event in the energy level sequence. i The ratio between the set value U0 and Data i The i-th microseismic event is converted into Data according to this ratio. i A basic microseismic event. Specifically, it satisfies the following calculation formula:

[0085] Data i =U i / U0

[0086] At this point, the energy level sequence {U1, U2, ..., U...} i The equivalent number of basic microseismic events {Data1, Data2, ..., Data i Replacement.

[0087] The overburden failure height determination method provided in this application converts microseismic events within a first target range into basic microseismic events, considers the influence of the energy magnitude of the microseismic events on the overburden failure height, and improves the prediction accuracy of the overburden failure height.

[0088] Optionally, the step of selecting a second target range based on the expected development height and determining the tracking radius based on the limit span of the top plate within the second target range includes:

[0089] The second target range is selected based on the expected development height of the water-conducting fracture zone at the working face;

[0090] The ultimate span of the top plate is determined based on the lithology, uniaxial tensile strength, rock layer thickness, burial depth, and unit weight of the top plate within the second target range.

[0091] The maximum value of the limit span is determined to be the tracking radius.

[0092] Specifically, after selecting the second target range based on the expected development height of the water-conducting fracture zone in the working face, the mechanical parameters within the second target range are obtained to determine the ultimate span of the roof, and then the tracking radius is selected.

[0093] The predicted development height of the water-conducting fracture zone at the working face can be determined based on the mechanical parameters of the overlying strata. However, since the predicted development height of the water-conducting fracture zone is difficult to predict accurately in actual production, it is necessary to extend the strata based on the prediction. For example, extend the strata upwards and downwards by 50% from the predicted water-conducting fracture zone as a second target range. Further statistical analysis of data such as lithology, uniaxial tensile strength, stratum thickness, and burial depth of the roof within the second target range is used to determine the ultimate span at various points near the roof.

[0094] Optionally, the determination of the ultimate span of the top plate within the second target range satisfies the following calculation formula:

[0095] L = 4hR T / (3γH)

[0096] Where L represents the ultimate span in meters; h represents the rock stratum thickness in meters; and R T γ represents uniaxial tensile strength, measured in Pascals; γ represents unit weight, measured in Newtons per cubic meter; H represents burial depth, measured in meters.

[0097] Rock stratum thickness refers to the vertical distance between upper and lower rock strata. Uniaxial tensile strength refers to the maximum tensile stress that rock can withstand under uniaxial tensile load. Unit weight refers to the weight of a unit volume of rock. Burial depth indicates the vertical distance from the apex to the surface.

[0098] From the perspective of rock strata fracture, the maximum value L of the ultimate span near the top of the water-conducting fracture zone is taken. max As the tracking radius.

[0099] The overburden failure height determination method provided in this application improves the prediction accuracy of overburden failure height by selecting a second target range based on the expected development height of the water-conducting fracture zone, statistically analyzing the ultimate span of each vertex within the second target range, and using the maximum value of the ultimate span as the tracking radius of the microseismic event.

[0100] Optionally, determining the core point of a microseismic event based on the number of basic microseismic events within the tracking radius includes:

[0101] When the number of basic microseismic events within the tracking radius exceeds a preset threshold, the effective area and effective points are determined.

[0102] The core point is determined by identifying the valid point that is always within the valid area within the preset range.

[0103] Specifically, for microseismic events within the first target range, it is necessary to further differentiate their importance based on the density and energy magnitude of the microseismic events, as well as their continuity.

[0104] To analyze the overburden failure characteristics along the strike of the working face, microseismic events at the working face are projected according to a set direction. Optionally, the set direction includes the working face advancing direction and / or the working face dipping direction.

[0105] Taking the working face advance direction (x-axis) as an example, the coordinates of the coal seam roof at the working face opening are marked as (x0, z0). Starting from the working face opening direction, the coordinates are continuously increased along the positive z-axis (the direction perpendicular to the coal seam overburden) from the coal seam roof, with the maximum value L of the limit span within the second target range as the reference. max To track the radius, a step-by-step search is performed using a sliding window approach.

[0106] When the number of basic microseismic events within the tracking radius is greater than the preset threshold D, the basic microseismic events within the tracking radius are considered valid points, and the area where the tracking radius is located is considered a valid area, or in other words, the area formed by the valid points is considered a valid area.

[0107] If no new search point is found in the positive z-axis direction, then the search point is incremented continuously in the positive x-axis direction, with L... max To track the radius, a step-by-step search is performed using a sliding window approach to further search for valid points.

[0108] At this point, the microseismic events within the first target area are divided into boundary points and effective points. Further, core points are determined among the effective points. If an effective point remains within a preset range and is consistently located within the effective region, then that effective point is determined as the core point. This application determines the core point based on the energy magnitude of the microseismic events and from the perspective of regional density.

[0109] Figure 4 This is a schematic diagram illustrating the determination of the core point of a microseismic event according to an embodiment of this application, such as... Figure 4 As shown, triangles represent boundary points, hollow circles represent valid points, solid circles represent core points, and the area within the dashed circle is the valid area where the microseismic events of the foundation within the tracking radius are greater than the preset threshold D. The preset threshold D is 4, and microseismic events of the foundation located within at least two valid areas (dashed circles) are considered core points.

[0110] Finally, the coordinates of the highest point of the core point are calculated and used as the overburden failure height.

[0111] The overburden failure height determination method provided in this application comprehensively considers the density, energy magnitude, and continuity of microseismic events, tracks the propagation path of microseismic events during overburden movement, and dynamically obtains the overburden failure height, ensuring the timeliness and accuracy of overburden failure height determination. This provides important support for analyzing the degree and scope of water hazard threats during working face mining and improves the level of mine safety production.

[0112] The overburden failure height determination device provided in this application is described below. The overburden failure height determination device described below and the overburden failure height determination method described above can be referred to in correspondence.

[0113] Figure 5 This is a schematic diagram of the overburden failure height determination device provided in the embodiments of this application, as shown below. Figure 5 As shown, the device includes at least:

[0114] The acquisition module 501 is used to acquire the location and energy value of microseismic events through multiple microseismic monitoring stations arranged downhole and on the surface;

[0115] The first determining module 502 is used to determine the first target range based on the expected development height of the water-conducting fracture zone in the working face, the rock strata movement angle, and the location of the mining roadway;

[0116] The conversion module 503 is used to convert each microseismic event within the first target range into a basic microseismic event according to the ratio of the energy value of each microseismic event within the first target range to a set value.

[0117] The second determining module 504 is used to select a second target range based on the expected development height, and to determine the tracking radius based on the limit span of the top plate within the second target range;

[0118] The third determining module 505 is used to search within the first target range according to a set direction and the tracking radius, determine the core point of the microseismic event based on the number of basic microseismic events within the tracking radius, and determine the overburden failure height based on the coordinates of the highest point among the core points.

[0119] Optionally, the first determining module is further configured to:

[0120] Based on the mechanical parameters of the overlying strata, the expected development height of the water-conducting fracture zone in the working face is determined;

[0121] The displacement angle of the overlying strata is determined based on the type of overlying strata;

[0122] The expansion range of the mining roadway is determined based on the predicted development height (set multiple) and the cotangent value of the rock strata movement angle.

[0123] The first target range is determined based on the location of the mining roadway and the expansion range.

[0124] Optionally, the set value is determined based on the following steps:

[0125] The microseismic events within the first target range are sorted according to their energy values, and the energy values ​​that meet the set conditions are taken as the set values. The microseismic events corresponding to the set values ​​are taken as the basic microseismic events.

[0126] Optionally, the second determining module is further configured to:

[0127] Based on the lithology, uniaxial tensile strength, rock layer thickness, burial depth, and unit weight of the top plate within the second target range, determine the ultimate span of the top plate within the second target range;

[0128] The maximum value of the limit span is determined to be the tracking radius.

[0129] Optionally, the determination of the ultimate span of the top plate within the second target range satisfies the following calculation formula:

[0130] L = 4hR T / (3γH)

[0131] Where L represents the ultimate span in meters; h represents the rock stratum thickness in meters; R T γ represents uniaxial tensile strength, measured in Pascals; γ represents unit weight, measured in Newtons per cubic meter; H represents burial depth, measured in meters.

[0132] Optionally, the third determining module is further configured to:

[0133] When the number of basic microseismic events within the tracking radius exceeds a preset threshold, the effective area and effective points are determined.

[0134] The core point is determined by identifying the valid point that is always within the valid area within the preset range.

[0135] Optionally, the set direction includes the working face advancing direction and / or the working face tilting direction.

[0136] Figure 6 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application, such as... Figure 6 As shown, the electronic device may include: a processor 601, a communication interface 602, a memory 603, and a communication bus 604, wherein the processor 601, the communication interface 602, and the memory 603 communicate with each other via the communication bus 604. The processor 601 can call logical instructions in the memory 603 to execute a method for determining the overburden failure height, the method including:

[0137] The location and energy values ​​of microseismic events are obtained through multiple microseismic monitoring stations deployed both underground and on the surface.

[0138] The first target range is determined based on the expected development height of the water-conducting fracture zone in the working face, the rock strata movement angle, and the location of the mining roadway;

[0139] Based on the ratio of the energy value of each microseismic event within the first target range to a set value, each microseismic event within the first target range is converted into a basic microseismic event according to the corresponding ratio.

[0140] The second target range is selected based on the expected development height, and the tracking radius is determined based on the limit span of the top plate within the second target range;

[0141] Within the first target range, a search is performed according to the set direction and the tracking radius. The core point of the microseismic event is determined based on the number of basic microseismic events within the tracking radius. The overburden failure height is determined based on the coordinates of the highest point among the core points.

[0142] Optionally, determining the first target range based on the expected development height of the water-conducting fracture zone at the working face, the strata movement angle, and the location of the mining roadway includes:

[0143] Based on the mechanical parameters of the overlying strata, the expected development height of the water-conducting fracture zone in the working face is determined;

[0144] The displacement angle of the overlying strata is determined based on the type of overlying strata;

[0145] The expansion range of the mining roadway is determined based on the predicted development height (set multiple) and the cotangent value of the rock strata movement angle.

[0146] The first target range is determined based on the location of the mining roadway and the expansion range.

[0147] Optionally, the set value is determined based on the following steps:

[0148] The microseismic events within the first target range are sorted according to their energy values, and the energy values ​​that meet the set conditions are taken as the set values. The microseismic events corresponding to the set values ​​are taken as the basic microseismic events.

[0149] Optionally, determining the tracking radius based on the limit span of the top plate within the second target range includes:

[0150] Based on the lithology, uniaxial tensile strength, rock layer thickness, burial depth, and unit weight of the top plate within the second target range, determine the ultimate span of the top plate within the second target range;

[0151] The maximum value of the limit span is determined to be the tracking radius.

[0152] Optionally, the determination of the ultimate span of the top plate within the second target range satisfies the following calculation formula:

[0153] L = 4hR T / (3γH)

[0154] Where L represents the ultimate span in meters; h represents the rock stratum thickness in meters; R T γ represents uniaxial tensile strength, measured in Pascals; γ represents unit weight, measured in Newtons per cubic meter; H represents burial depth, measured in meters.

[0155] Optionally, determining the core point of a microseismic event based on the number of basic microseismic events within the tracking radius includes:

[0156] When the number of basic microseismic events within the tracking radius exceeds a preset threshold, the effective area and effective points are determined.

[0157] The core point is determined by identifying the valid point that is always within the valid area within the preset range.

[0158] Optionally, the set direction includes the working face advancing direction and / or the working face tilting direction.

[0159] Furthermore, the logical instructions in the aforementioned memory 603 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to related technologies, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0160] On the other hand, this application also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the overburden failure height determination method provided by the above methods, including:

[0161] The location and energy values ​​of microseismic events are obtained through multiple microseismic monitoring stations deployed both underground and on the surface.

[0162] The first target range is determined based on the expected development height of the water-conducting fracture zone in the working face, the rock strata movement angle, and the location of the mining roadway;

[0163] Based on the ratio of the energy value of each microseismic event within the first target range to a set value, each microseismic event within the first target range is converted into a basic microseismic event according to the corresponding ratio.

[0164] The second target range is selected based on the expected development height, and the tracking radius is determined based on the limit span of the top plate within the second target range;

[0165] Within the first target range, a search is performed according to the set direction and the tracking radius. The core point of the microseismic event is determined based on the number of basic microseismic events within the tracking radius. The overburden failure height is determined based on the coordinates of the highest point among the core points.

[0166] Optionally, determining the first target range based on the expected development height of the water-conducting fracture zone at the working face, the strata movement angle, and the location of the mining roadway includes:

[0167] Based on the mechanical parameters of the overlying strata, the expected development height of the water-conducting fracture zone in the working face is determined;

[0168] The displacement angle of the overlying strata is determined based on the type of overlying strata;

[0169] The expansion range of the mining roadway is determined based on the predicted development height (set multiple) and the cotangent value of the rock strata movement angle.

[0170] The first target range is determined based on the location of the mining roadway and the expansion range.

[0171] Optionally, the set value is determined based on the following steps:

[0172] The microseismic events within the first target range are sorted according to their energy values, and the energy values ​​that meet the set conditions are taken as the set values. The microseismic events corresponding to the set values ​​are taken as the basic microseismic events.

[0173] Optionally, determining the tracking radius based on the limit span of the top plate within the second target range includes:

[0174] Based on the lithology, uniaxial tensile strength, rock layer thickness, burial depth, and unit weight of the top plate within the second target range, determine the ultimate span of the top plate within the second target range;

[0175] The maximum value of the limit span is determined to be the tracking radius.

[0176] Optionally, the determination of the ultimate span of the top plate within the second target range satisfies the following calculation formula:

[0177] L = 4hR T / (3γH)

[0178] Where L represents the ultimate span in meters; h represents the rock stratum thickness in meters; R T γ represents uniaxial tensile strength, measured in Pascals; γ represents unit weight, measured in Newtons per cubic meter; H represents burial depth, measured in meters.

[0179] Optionally, determining the core point of a microseismic event based on the number of basic microseismic events within the tracking radius includes:

[0180] When the number of basic microseismic events within the tracking radius exceeds a preset threshold, the effective area and effective points are determined.

[0181] The core point is determined by identifying the valid point that is always within the valid area within the preset range.

[0182] Optionally, the set direction includes the working face advancing direction and / or the working face tilting direction.

[0183] Furthermore, this application also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the overburden failure height determination method provided by the methods described above, the method comprising:

[0184] The location and energy values ​​of microseismic events are obtained through multiple microseismic monitoring stations deployed both underground and on the surface.

[0185] The first target range is determined based on the expected development height of the water-conducting fracture zone in the working face, the rock strata movement angle, and the location of the mining roadway;

[0186] Based on the ratio of the energy value of each microseismic event within the first target range to a set value, each microseismic event within the first target range is converted into a basic microseismic event according to the corresponding ratio.

[0187] The second target range is selected based on the expected development height, and the tracking radius is determined based on the limit span of the top plate within the second target range;

[0188] Within the first target range, a search is performed according to the set direction and the tracking radius. The core point of the microseismic event is determined based on the number of basic microseismic events within the tracking radius. The overburden failure height is determined based on the coordinates of the highest point among the core points.

[0189] Optionally, determining the first target range based on the expected development height of the water-conducting fracture zone at the working face, the strata movement angle, and the location of the mining roadway includes:

[0190] Based on the mechanical parameters of the overlying strata, the expected development height of the water-conducting fracture zone in the working face is determined;

[0191] The displacement angle of the overlying strata is determined based on the type of overlying strata;

[0192] The expansion range of the mining roadway is determined based on the predicted development height (set multiple) and the cotangent value of the rock strata movement angle.

[0193] The first target range is determined based on the location of the mining roadway and the expansion range.

[0194] Optionally, the set value is determined based on the following steps:

[0195] The microseismic events within the first target range are sorted according to their energy values, and the energy values ​​that meet the set conditions are taken as the set values. The microseismic events corresponding to the set values ​​are taken as the basic microseismic events.

[0196] Optionally, determining the tracking radius based on the limit span of the top plate within the second target range includes:

[0197] The ultimate span of the top plate within the second target range is determined based on the lithology, uniaxial tensile strength, rock layer thickness, burial depth, and unit weight of the top plate within the second target range.

[0198] The maximum value of the limit span is determined to be the tracking radius.

[0199] Optionally, the determination of the ultimate span of the top plate within the second target range satisfies the following calculation formula:

[0200] L = 4hR T / (3γH)

[0201] Where L represents the ultimate span in meters; h represents the rock stratum thickness in meters; R T γ represents uniaxial tensile strength, measured in Pascals; γ represents unit weight, measured in Newtons per cubic meter; H represents burial depth, measured in meters.

[0202] Optionally, determining the core point of a microseismic event based on the number of basic microseismic events within the tracking radius includes:

[0203] When the number of basic microseismic events within the tracking radius exceeds a preset threshold, the effective area and effective points are determined.

[0204] The core point is determined by identifying the valid point that is always within the valid area within the preset range.

[0205] Optionally, the set direction includes the working face advancing direction and / or the working face tilting direction.

[0206] The device embodiments described above are merely illustrative. 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0207] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of software products. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0208] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 this application.

Claims

1. A method for determining the height of overburden failure, characterized in that, include: The location and energy values ​​of microseismic events are obtained through multiple microseismic monitoring stations deployed both underground and on the surface. The first target range is determined based on the expected development height of the water-conducting fracture zone in the working face, the rock strata movement angle, and the location of the mining roadway; The microseismic events within the first target range are sorted according to their energy values, and the energy values ​​that meet the set conditions are taken as the set values. The microseismic events corresponding to the set values ​​are taken as the basic microseismic events. Based on the ratio of the energy value of each microseismic event within the first target range to the set value, each microseismic event within the first target range is converted into a basic microseismic event according to the corresponding ratio. The second target range is selected based on the expected development height, and the tracking radius is determined based on the limit span of the top plate within the second target range; Within the first target range, a search is performed according to the set direction and the tracking radius. The core point of the microseismic event is determined based on the number of basic microseismic events within the tracking radius. The overburden failure height is determined based on the coordinates of the highest point among the core points.

2. The method for determining the height of overburden failure according to claim 1, characterized in that, The determination of the first target range based on the expected development height of the water-conducting fracture zone at the working face, the rock strata movement angle, and the location of the mining roadway includes: Based on the mechanical parameters of the overlying strata, the expected development height of the water-conducting fracture zone in the working face is determined; The displacement angle of the overlying strata is determined based on the type of overlying strata; The expansion range of the mining roadway is determined based on the predicted development height (set multiple) and the cotangent value of the rock strata movement angle. The first target range is determined based on the location of the mining roadway and the expansion range.

3. The method for determining the height of overburden failure according to claim 1, characterized in that, The step of determining the tracking radius based on the limit span of the top plate within the second target range includes: Based on the lithology, uniaxial tensile strength, rock layer thickness, burial depth, and unit weight of the top plate within the second target range, determine the ultimate span of the top plate within the second target range; The maximum value of the limit span is determined to be the tracking radius.

4. The method for determining the height of overburden failure according to claim 3, characterized in that, The determination of the ultimate span of the top plate within the second target range satisfies the following calculation formula: ； Where L represents the ultimate span in meters; h represents the rock stratum thickness in meters. γ represents uniaxial tensile strength, measured in Pascals; γ represents unit weight, measured in Newtons per cubic meter; H represents burial depth, measured in meters.

5. The method for determining the height of overburden failure according to claim 1, characterized in that, The determination of the core point of a microseismic event based on the number of basic microseismic events within the tracking radius includes: When the number of basic microseismic events within the tracking radius exceeds a preset threshold, the effective area and effective points are determined. The core point is determined by identifying the valid point that is always within the valid area within the preset range.

6. The method for determining the height of overburden failure according to claim 1 or 5, characterized in that, The set direction includes the working face advancing direction and / or the working face tilting direction.

7. A device for determining the height of overburden failure, characterized in that, include: The acquisition module is used to acquire the location and energy values ​​of microseismic events through multiple microseismic monitoring stations deployed underground and on the surface; The first determining module is used to determine the first target range based on the expected development height of the water-conducting fracture zone in the working face, the rock strata movement angle, and the location of the mining roadway; The conversion module is used to sort the microseismic events within the first target range according to their energy values, take the energy values ​​that meet the set conditions as the set values, and take the microseismic events corresponding to the set values ​​as the basic microseismic events. Based on the ratio of the energy value of each microseismic event within the first target range to the set value, each microseismic event within the first target range is converted into a basic microseismic event according to the corresponding ratio. The second determining module is used to select a second target range based on the expected development height, and to determine the tracking radius based on the limit span of the top plate within the second target range; The third determining module is used to search within the first target range according to a set direction and the tracking radius, determine the core point of the microseismic event based on the number of basic microseismic events within the tracking radius, and determine the overburden failure height based on the coordinates of the highest point among the core points.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method for determining the overburden damage height as described in any one of claims 1 to 6.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for determining the overburden failure height as described in any one of claims 1 to 6.

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