Strong mine pressure roof dominant layer position determination method, device and system

Abstract

The application provides a strong mine pressure roof dominant layer position determination method, device and system, which comprises the following steps: determining the breaking start and end time of each roof rock layer from the coal mining face to the ground of the to-be-monitored mine surface based on first sensing data; determining the pressure start and end time of the coal mining face based on second sensing data; performing time correlation degree analysis on the breaking start and end time of the target roof rock layer and the pressure start and end time of the coal mining face, and determining a correlation degree coefficient; and in the case that the correlation degree coefficient is greater than or equal to a first preset threshold, determining that the target roof rock layer is the dominant layer position. The strong mine pressure roof dominant layer position determination method, device and system provided by the application realize the entry from the time correlation angle of the roof breaking and the working face pressure, accurately screen and determine the strong mine pressure dominant layer position, and further provide favorable technical support for the working face strong mine pressure disaster mechanism research and on-site engineering management.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mining, in particular to a strong mine pressure roof dominant layer position determination method, device and system. BACKGROUND

[0002] The thick and hard roof refers to a roof rock stratum with large rock strength and elastic modulus, underdeveloped joint fissure, large thickness, strong integrity and strong self-supporting capacity, and has the characteristics of large area suspension after coal mining and short-term difficulty in collapse in the goaf. The coal mining under the thick and hard roof is prone to produce the phenomenon of long suspension span and large suspension area of the roof, which causes the mining field, roadway and roadside support body to be in a high stress and high disturbance state for a long time, resulting in strong mine pressure phenomena such as strong mine pressure of the mining field, instability of the pillar, damage and deformation of the roadway, roof impact and the like.

[0003] Under the geological conditions of multiple thick and hard roofs, the particularity and complexity of the overburden breaking and the mining pressure appearance of the working face will be further deepened. The existing research and practice show that there is a significant difference in the influence degree of different layer positions of the roof rock stratum on the mining pressure appearance of the working face, and one or more rock strata control the overall movement characteristics of the roof rock stratum, and then dominate the start, development and evolution of the mining pressure of the working face. Therefore, under the condition of one or more thick and hard overburden, the mining pressure of the coal mining working face is complex and changeable, and the dominant roof layer position of the strong mine pressure is difficult to determine, which is an important issue to be solved in the industry. SUMMARY

[0004] The present application provides a strong mine pressure roof dominant layer position determination method, device and system to solve the defect that the dominant layer position of the strong mine pressure of the coal mining working face under the condition of multiple thick and hard roofs is difficult to determine in the prior art.

[0005] The present application provides a strong mine pressure roof dominant layer position determination method, comprising:

[0006] Based on the first sensing data, the breaking start and end time of each roof rock stratum from the coal mining working face to the ground of the to-be-monitored mining face is determined;

[0007] Based on the second sensing data, the pressure start and end time of the coal mining working face is determined;

[0008] The breaking start and end time of the target roof rock stratum and the pressure start and end time of the coal mining working face are analyzed in time correlation, and a correlation degree coefficient is determined;

[0009] In the case where the correlation degree coefficient is greater than or equal to a first preset threshold, the target roof rock stratum is determined as the dominant layer position;

[0010] The target roof stratum is one or more roof strata in the monitored mining face; the first sensing data is longitudinal displacement data collected by a first sensing module during the breaking of each roof stratum; and the second sensing data is pressure data collected by a second sensing module arranged on each support column of the coal mining face during the breaking of each roof stratum.

[0011] According to the strong mine pressure roof dominant layer position determination method provided by the application, before determining the breaking start and end time of each roof stratum from the coal mining face to the ground based on the first sensing data, the method further comprises the following steps of:

[0012] In the case that the breaking energy level data in the third sensing data is greater than or equal to the second preset threshold value, the dominant stratum range is determined based on each roof stratum from the coal mining face to the ground.

[0013] The third sensing data is microseismic data collected by a third sensing module arranged on the coal mining face during the breaking of each roof stratum.

[0014] According to the strong mine pressure roof dominant layer position determination method provided by the application, after determining the pressure coming start and end time of the coal mining face based on the second sensing data, the method further comprises the following steps of:

[0015] Target microseismic data corresponding to a target time period is extracted from the third sensing data.

[0016] The target roof stratum is selected from each of the dominant stratum ranges based on the target microseismic data.

[0017] The target time period is determined from the end of the previous pressure coming to the end of the current pressure coming.

[0018] According to the strong mine pressure roof dominant layer position determination method provided by the application, the breaking start and end time of the target roof stratum and the pressure coming start and end time of the coal mining face are subjected to time correlation analysis to determine a correlation degree coefficient, which comprises the following steps of:

[0019] The breaking duration is determined based on the breaking start and end time of the target roof stratum.

[0020] The pressure coming duration is determined based on the pressure coming start and end time of the coal mining face.

[0021] The correlation degree coefficient is determined based on the breaking duration and the pressure coming duration.

[0022] According to the strong mine pressure roof dominant layer position determination method provided by the application, the breaking start and end time of each roof stratum from the coal mining face to the ground of the monitored mining face is determined based on the first sensing data, which comprises the following steps of:

[0023] determine a displacement change rate based on the first sensing data;

[0024] determine the breaking start and end time of each roof stratum based on the displacement change rate.

[0025] The application further provides a strong mine pressure roof dominant horizon determination device, comprising:

[0026] a breaking feature acquisition module configured to determine the breaking start and end time of each roof stratum from the coal mining face to the surface of the to-be-monitored mine face based on first sensing data;

[0027] a weighting feature acquisition module configured to determine the weighting start and end time of the coal mining face based on second sensing data;

[0028] a time correlation module configured to perform time correlation degree analysis on the breaking start and end time of the target roof stratum and the weighting start and end time of the coal mining face, and determine a correlation degree coefficient;

[0029] a dominant horizon judgment module configured to determine the target roof stratum as a dominant horizon when the correlation degree coefficient is greater than or equal to a first preset threshold.

[0030] The target roof stratum is one or more roof strata in the to-be-monitored mine face; the first sensing data is longitudinal displacement data collected by the first sensing module during the breaking process of each roof stratum; and the second sensing data is pressure data collected by the second sensing module arranged on each support column of the coal mining face during the breaking process of each roof stratum.

[0031] The application further provides a strong mine pressure roof dominant horizon determination system, comprising a first sensing module arranged in a to-be-detected mine face, a second sensing module arranged on each support column of a coal mining face, and a remote terminal configured to perform any one of the strong mine pressure roof dominant horizon determination methods described above.

[0032] The first sensing module is configured to send the collected longitudinal displacement data as first sensing data to the remote terminal during the breaking process of each roof stratum.

[0033] The second sensing module is configured to send the collected pressure data of each support column of the coal mining face as second sensing data to the remote terminal during the breaking process of each roof stratum.

[0034] The application further provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any one of the strong mine pressure roof dominant horizon determination methods described above when executing the program.

[0035] The application further provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the strong roof strata dominant horizon determination method according to any one of the above.

[0036] The application further provides a computer program product comprising a computer program which, when executed by a processor, implements the strong roof strata dominant horizon determination method according to any one of the above.

[0037] The strong roof strata dominant horizon determination method, device and system provided by the application determine the start and end times of the breaking of each roof strata based on first sensing data, determine the start and end times of the weighting of the coal mining face based on second sensing data, calculate the time coincidence degree of the start and end times of the breaking of the target roof strata and the weighting of the working face, and determine whether the target roof strata is the dominant horizon according to the correlation degree coefficient obtained by calculation. The strong roof strata dominant horizon is accurately screened and determined from the perspective of the time correlation of the breaking of the roof and the weighting of the working face, which provides favorable technical support for the research on the disaster-causing mechanism of the strong roof and the on-site engineering management. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0039] Figure 1 is one of the flowcharts of the strong roof strata dominant horizon determination method provided by the application;

[0040] Figure 2 is another flowchart of the strong roof strata dominant horizon determination method provided by the application;

[0041] Figure 3 is one of the simulation diagrams of the strong roof strata dominant horizon determination method provided by the application;

[0042] Figure 4 is another simulation diagram of the strong roof strata dominant horizon determination method provided by the application;

[0043] Figure 5 is a third simulation diagram of the strong roof strata dominant horizon determination method provided by the application;

[0044] Figure 6 is a structural diagram of the strong roof strata dominant horizon determination device provided by the application;

[0045] Figure 7 is a structural schematic view of a strong roof strata dominant horizon determination system provided by the present application;

[0046] Figure 8 is a structural schematic view of an electronic device provided by the present application. DETAILED DESCRIPTION

[0047] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0048] The terms "first", "second", and the like in the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually a class and do not limit the number of objects, for example, the first object can be one or more.

[0049] It should be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0050] The terms "include" and "contain" indicate the presence of the described features, whole, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, whole, steps, operations, elements, components and / or sets thereof.

[0051] Figure 1 is one of the flowcharts of the strong roof strata dominant horizon determination method provided by the present application. As shown in Figure 1 The strong roof strata dominant horizon determination method provided by the embodiment of the present application comprises: step 101, determining the breaking start and end time of each roof strata from the coal mining face to the surface of the mine surface to be monitored based on the first sensing data.

[0052] The first sensing data is the longitudinal displacement data collected by the first sensing module during the breaking process of each roof strata.

[0053] It should be noted that the execution subject of the strong mine pressure roof dominant layer position determination method provided by the embodiment of the present application is the strong mine pressure roof dominant layer position determination device.

[0054] The strong mine pressure roof dominant layer position determination method provided by the embodiment of the present application is suitable for a user in a mine field to mine the close causal relationship between the roof breaking and caving subsidence and the strong mine pressure of the working face through an electronic device, so as to determine the dominant layer position of the working face under the strong mine pressure.

[0055] The electronic device described in the embodiment of the present application can be implemented in various forms. For example, the electronic device described in the embodiment of the present application can include a mobile terminal such as a mobile phone, a smart phone, a notebook computer, a digital broadcast receiver, a PDA (Personal Digital Assistant), a PAD (Tablet Personal Computer), a PMP (Portable Multimedia Player), a navigation device, a smart bracelet, a smart watch, etc., and a fixed terminal such as a digital TV, a desktop computer, etc. Hereinafter, it is assumed that the electronic device is a mobile terminal. However, those skilled in the art will understand that the configuration according to the embodiment of the present application can also be applied to a terminal of a fixed type, except for elements particularly used for mobile purposes.

[0056] It should be noted that before step 101, after the strong mine pressure roof dominant layer position determination device is started, as the coal seam is mined out, the overburden strata will lose the support of the lower coal seam and break and subside, and then the first sensing module is driven to directly observe and monitor the movement or displacement of the rock mass on site. Therefore, the displacement data of the rock mass detected by the first sensing module in the longitudinal direction during the breaking process of each roof rock layer is transmitted to the strong mine pressure roof dominant layer position determination device as first sensing data.

[0057] Specifically, in step 101, after the first sensing data is subjected to preprocessing operations such as time stamp alignment, parameter completion, mean value supplement, and outlier removal, the longitudinal displacement variation trend of each roof rock layer from the coal seam to the surface during the breaking and subsidence process with time can be obtained, so as to determine the breaking start and end time of the corresponding roof rock layer.

[0058] Step 102, determining the pressure coming start and end time of the coal mining working face based on the second sensing data.

[0059] The second sensing data is the pressure data collected by the second sensing module arranged on the support column of the coal mining working face during the breaking process of each roof rock layer.

[0060] It should be noted that the second sensing module is arranged on one or more supports in the coal mining face, and as the roof strata break and sink layer by layer, part of the rock strata will transfer the weight to the support in the working face, causing the column pressure of the support to rise. That is, when the working face is pressed, the second sensing module can transmit the pressure sensed by the column to the strong roof strata dominant layer position determination device as second sensing data.

[0061] Specifically, in step 102, after the second sensing data is subjected to data timestamp alignment, parameter completion, mean value supplement, and abnormal value elimination, etc. Pretreatment operation, the pressure change trend of the support in the coal mining face with time during the breaking and sinking of each roof strata can be obtained, so as to determine the start and end time of the strong pressure perceived by the coal mining face corresponding to the breaking of each strata.

[0062] Step 103, time correlation analysis is performed on the breaking start and end time of the target roof strata and the pressure start and end time of the coal mining face, and a correlation degree coefficient is determined.

[0063] Among them, the target roof strata is one or more roof strata in the monitored coal face.

[0064] It should be noted that the target roof strata refers to one or more roof strata with relatively high breaking activity among the roof strata from the coal seam to the surface of the monitored coal face.

[0065] Specifically, in step 103, the strong roof strata dominant layer position determination device compares and analyzes the coincidence degree between the breaking start and end time of the target roof strata and the pressure start and end time of the coal mining face based on the high participation degree of the strong pressure dominant layer position in the working face strong pressure time, and calculates the correlation degree coefficient between the strata breaking and the working face pressure.

[0066] Step 104, in the case where the correlation degree coefficient is greater than or equal to the first preset threshold, the target roof strata is determined as the dominant layer position.

[0067] It should be noted that there is a close causal relationship between the roof breaking and sinking and the working face pressure, that is, the necessary condition for the working face strong pressure is the active breaking of thick and hard roof. Therefore, compared with the non-dominant layer position, the strong pressure dominant layer position will have a higher time coincidence degree in the breaking and sinking stage and the continuous pressure stage of the working face. Therefore, the first preset threshold is a threshold set for the comparison of the correlation degree coefficient.

[0068] Specifically, in step 104, the strong roof strata dominant layer position determination device compares and analyzes the correlation degree coefficient and the first preset threshold:

[0069] If the correlation degree coefficient is greater than or equal to the first preset threshold, that is, the target roof rock stratum is highly overlapped with the continuous strong pressure stage of the working face in the breaking subsidence stage, the target roof rock stratum is a thick and hard roof rock stratum, and a relatively large amount of time cost is required to complete the breaking in the entire breaking process, so the target roof rock stratum is determined as the main layer.

[0070] On the contrary, if the correlation degree coefficient is less than the first preset threshold, that is, the target roof rock stratum is not overlapped with the continuous strong pressure stage of the working face in the breaking subsidence stage, the target roof rock stratum is determined as a non-main layer.

[0071] In the embodiment of the application, the breaking start and end time of each roof rock stratum is determined based on the first sensing data, the pressure start and end time of the coal mining working face is determined based on the second sensing data, the starting and ending time of the target roof rock stratum breaking and the working face pressure are calculated, and whether the target roof rock stratum is a main layer is determined according to the size of the correlation degree coefficient. From the perspective of time correlation of roof breaking and working face pressure, the strong mine pressure main layer is accurately screened and determined, and then favorable technical support is provided for the research of working face strong mine pressure disaster mechanism and the development of on-site engineering management.

[0072] On the basis of any of the above embodiments, before determining the breaking start and end time of each roof rock stratum from the coal mining working face to the ground surface based on the first sensing data, it further includes: in the case that the breaking energy level data in the third sensing data is greater than or equal to the second preset threshold, determining the main rock stratum range based on each roof rock stratum from the coal mining working face to the ground surface.

[0073] The third sensing data is microseismic data collected by a third sensing module arranged on the coal mining working face during the breaking process of each roof rock stratum.

[0074] It should be noted that during the breaking process of the thick and hard roof, high-energy elastic waves will be released inside. Therefore, the third sensing module can be arranged in the coal mining working face to monitor and record the high-energy microseismic events caused by the roof breaking due to coal mining. The collected microseismic data includes spatial position H i , occurrence time T1 i , and breaking energy level E i .

[0075] The subscript i is the number of layers of the roof rock stratum. For example, from the ground surface to the coal mining working face downward, the number of layers of i increases sequentially.

[0076] The second preset threshold is a threshold set for the breaking energy level in the microseismic data. The second preset threshold is used to compare and analyze the energy and frequency of the microseismic time, which can intuitively and reliably reflect the activity degree of the rock stratum breaking.

[0077] Specifically, before step 101, the strong mine pressure roof dominant horizon determining device receives third sensing data fed back by the third sensing module in real time, extracts breakage energy level data from the third sensing data, and compares the breakage energy level data with the second preset threshold. Then, the subsequent strong mine pressure roof dominant horizon determining process is performed according to the dominant rock stratum range determined by the comparison analysis.

[0078] The embodiment of the present application is not limited to the implementation mode.

[0079] Exemplarily, Figure 2 is a second flowchart of a strong mine pressure roof dominant horizon determining method provided by the present application. As Figure 2 indicated, the strong mine pressure roof dominant horizon determining method provided by the embodiment of the present application comprises the following steps:

[0080] Step 201: high-energy microseismic event monitoring is performed through the third sensing data, and the spatial position, time and intensity of the breakage of the thick and hard roof are positioned and judged in combination with the second preset threshold.

[0081] Step 202-1: if the breakage energy level data of the third sensing data is greater than or equal to the second preset threshold, it means that the thick and hard roof stratum exists based on the to-be-monitored mining face, the spatial position data and the occurrence time data are integrated from the third sensing data, the dominant rock stratum range is determined in each roof stratum from the coal seam of the to-be-monitored mining face to the surface, and step 203 is continuously executed.

[0082] Step 202-1: if the breakage energy level data is less than the second preset threshold, it means that the breakage is not active based on the to-be-monitored mining face, and all the roof strata are non-dominant horizons, and then the above judgment is continued to be performed on the next coal mining face.

[0083] Step 203: the breakage start and end time of each roof stratum in the dominant rock stratum range is determined according to the first sensing data.

[0084] Step 204: the pressure start and end time of the coal mining face is determined according to the second sensing data.

[0085] Step 205: the breakage start and end time of the target roof stratum obtained in step 203 and the pressure start and end time of the coal mining face obtained in step 204 are analyzed in time correlation degree, and a correlation degree coefficient is determined.

[0086] Step 206: the correlation degree coefficient between the breakage of the target roof stratum and the pressure of the coal mining face is compared in combination with the first preset threshold:

[0087] If the correlation degree coefficient is greater than or equal to the first preset threshold, the target roof stratum is determined as the strong mine pressure dominant horizon.

[0088] If the correlation degree coefficient is less than the first preset threshold, the target roof stratum is determined as a strong mine pressure secondary action horizon.

[0089] The embodiment of the present application first analyzes the breaking activity degree of each layer of roof stratum according to the breaking energy level data in the third sensing data, to preliminarily determine the dominant stratum range. Further, the breaking start and end time of the roof stratum in the dominant stratum range can be directly monitored, to perform time correlation with the pressure start and end time of the coal mining face, to calculate the time coincidence degree, and to judge the dominant horizon. The active degree of participation of each layer of roof stratum in the strong mine pressure occurrence process can be mastered, the spatial correlation analysis of the strong mine pressure roof breaking movement of the coal mining face is realized, the strong mine pressure dominant horizon is accurately screened and determined from the perspective of time correlation between the roof breaking and the pressure of the coal mining face, the screening efficiency of the dominant horizon is further improved, and further favorable technical support is provided for the strong mine pressure disaster mechanism research of the coal mining face and the on-site engineering management.

[0090] On the basis of any of the above embodiments, after determining the pressure start and end time of the coal mining face based on the second sensing data, the method further includes: extracting target microseismic data corresponding to a target time period from the third sensing data.

[0091] The target time period is determined from the end of the last pressure of the coal mining face to the end of the current pressure.

[0092] Specifically, after step 102, the strong mine pressure roof dominant horizon determination device extracts target microseismic data in the time period from the end of the last pressure of the coal mining face to the end of the current pressure from the third sensing data.

[0093] Based on the target microseismic data, the target roof stratum is screened from each dominant stratum range.

[0094] Specifically, the strong mine pressure roof dominant horizon determination device analyzes the spatial horizon of the large energy microseismic event according to the breaking energy level data contained in the target microseismic data, to eliminate the stratum with inactive breaking from the several roof strata covered by the dominant stratum range, and to take the remaining strata as the target roof stratum.

[0095] Exemplarily, Figure 3 is one of the simulation schematic diagrams of the strong mine pressure roof dominant horizon determination method provided by the present application. As Figure 3As shown, the strong mine pressure roof dominant horizon determining device can compare the breaking energy level data contained in the target microseismic data with the corresponding threshold, preliminarily screen and determine the thick and hard roof 1, the thick and hard roof 2, the thick and hard roof i… as the target roof strata in the strong pressure process through the relevant position information of the energy level greater than or equal to the corresponding threshold, and at the same time, through the relevant position information of the energy level less than the corresponding threshold, the thick and hard roof 3 of the non-high energy microseismic event aggregation layer is excluded to the non-determined range.

[0096] The embodiment of the present application extracts the target microseismic data corresponding to each strong pressure from the third sensing data, monitors the microseismic high energy event through the target microseismic data, and screens and determines the target roof strata active in the pressure process from the dominant strata range. The determination range of the strong mine pressure roof strata triggering strong mine pressure can be narrowed, the screening accuracy and efficiency of the dominant horizon can be further improved, and then favorable technical support is provided for the strong mine pressure disaster mechanism research and on-site engineering management of the working face.

[0097] On the basis of any of the above embodiments, the breaking start and end time of the target roof strata and the pressure start and end time of the coal mining face are analyzed in terms of time correlation degree, and a correlation degree coefficient is determined, including: determining the breaking duration based on the breaking start and end time of the target roof strata.

[0098] Specifically, in step 103, the strong mine pressure roof dominant horizon determining device obtains the breaking duration by subtracting the breaking start time from the breaking end time of the target roof strata.

[0099] Determine the pressure duration based on the pressure start and end time of the coal mining face.

[0100] Specifically, the strong mine pressure roof dominant horizon determining device obtains the pressure duration by subtracting the pressure start time from the pressure end time of the coal mining face.

[0101] Determine the correlation degree coefficient based on the breaking duration and the pressure duration.

[0102] Specifically, the strong mine pressure roof dominant horizon determining device obtains the time coincidence degree by comparing the pressure duration and the breaking duration, and since the time coincidence degree is positively correlated with the correlation degree between the two, the time coincidence degree can be directly used as the correlation degree coefficient.

[0103] It can be understood that the correlation degree coefficient can also be sorted in descending order, wherein:

[0104] The higher the correlation degree coefficient is, the higher the correlation between the corresponding target roof strata and the strong pressure of the working face is, that is, the strong mine pressure dominant horizon.

[0105] On the contrary, the lower the correlation degree coefficient is, the lower the corresponding target roof stratum and the strong pressure correlation of the working face are, that is, the secondary role position.

[0106] The broken duration and the pressure duration are determined based on the broken start and end time of the target roof stratum and the pressure start and end time of the coal mining working face respectively, the correlation degree coefficient is calculated by comparison, and the correlation degree coefficient is used as the judgment basis of the leading position. The spatial and temporal correlation of the roof breaking and the working face pressure is cut in from the perspective of the spatial and temporal correlation of the roof breaking and the working face pressure, the causal relationship between the roof breaking and the working face pressure is mined, the strong pressure leading position is comprehensively and scientifically screened and determined, and the screening accuracy, efficiency and reliability of the leading position are improved. Further, the strong pressure disaster mechanism research and the site engineering management are provided with favorable technical support.

[0107] Based on the first sensing data, the broken start and end time of each roof stratum from the coal mining working face to the ground of the to-be-monitored mining face is determined, including: based on the first sensing data, the displacement change rate is determined.

[0108] Specifically, in step 101, the strong pressure roof leading position determination device can fit the subsidence displacement-time change curve of the target roof stratum according to the real-time transmitted first sensing data, and then the displacement change rate corresponding to each point on the curve can be obtained.

[0109] Exemplarily, Figure 4 is a simulation diagram two of the strong pressure roof leading position determination method provided by the application. As Figure 4 shown, the subsidence process displayed by the subsidence displacement-time change curve of any roof stratum can be roughly divided into three stages:

[0110] (1) stable stage, in the initial stage of the subsidence process, the displacement change rate of the corresponding curve segment is small and changes relatively gently.

[0111] (2) broken subsidence stage, in the middle stage of the subsidence process, the displacement change rate of the corresponding curve segment changes from small to large, showing a relatively smooth change trend.

[0112] (3) accelerated collapse stage, in the final stage of the subsidence process, the displacement change rate of the corresponding curve segment changes from small to large, showing a relatively rapid change trend.

[0113] Based on the displacement change rate, the broken start and end time of each roof stratum is determined.

[0114] Specifically, the strong mine pressure roof dominant horizon determining device determines, according to the change trend of the displacement change rate of each point on the curve with time, that the change trend is a relatively smooth curve with the displacement change rate changing from small to large, and determines a time point T2 in the curve at which the displacement change rate is close to 0 0 As the breaking start time, a time point T2 in the curve at which the displacement change rate is the largest 1 As the breaking end time.

[0115] Similarly, for any support in the coal mining face, the strong mine pressure roof dominant horizon determining device can fit a support column working resistance-time change curve according to the second sensing data transmitted in real time.

[0116] Exemplarily, Figure 5 is the third simulation schematic diagram of the strong mine pressure roof dominant horizon determining method provided by the application. As shown in Figure 5 The working face pressure process shown by any support column working resistance-time change curve can be roughly divided into three stages:

[0117] (1) The pre-coming stage is in the initial stage of the coming process, and the curve corresponding to this stage shows a jump change trend.

[0118] (2) The middle coming stage is in the middle stage of the coming process, and the curve corresponding to this stage shows a periodic change trend of being stable at the corresponding pressure value.

[0119] (3) The end coming stage is in the final stage of the coming process, and the change trend is similar to that of the pre-coming stage.

[0120] Then, according to the change trend of the support column working resistance-time change curve, a time point T3 0 is taken as the coming start time, and a time point T3 1 is taken as the coming end time. Further, the correlation degree coefficient of the breaking characteristics of the target roof rock stratum and the working face coming characteristics is calculated according to the following formula:

[0121]

[0122] It can be understood that if the support column working resistance-time change curves corresponding to multiple supports in the coal mining face are used for calculation, the pressure data of the corresponding time points in the multiple change curves are added and averaged to finally fit a change curve representing the average stress level of the multiple supports.

[0123] The embodiment of the present application determines the start and end time of the roof strata breakage based on the displacement change rate of the first sensing data changing over time, and then calculates the correlation degree coefficient by comparison to serve as the judgment basis of the dominant horizon. The spatial and temporal correlation of the roof breakage and the working face pressure is cut in from the perspective, and the causal relationship between the roof strata breakage and the working face pressure is mined out, so that the strong mine pressure dominant horizon is determined comprehensively and scientifically, and the screening accuracy, efficiency and reliability of the dominant horizon are improved. Furthermore, the strong mine pressure disaster mechanism research and on-site engineering management are provided with favorable technical support.

[0124] Figure 6 is a structural schematic diagram of the strong mine pressure roof dominant horizon determination device provided by the present application. Based on any of the above embodiments, as shown in Figure 6 , the device comprises a breakage feature acquisition module 610, a pressure feature acquisition module 620, a time correlation module 630 and a dominant horizon judgment module 640, wherein:

[0125] The breakage feature acquisition module 610 is configured to determine the start and end time of the breakage of each roof strata from the surface of the coal mining face to be monitored based on the first sensing data.

[0126] The pressure feature acquisition module 620 is configured to determine the start and end time of the pressure based on the second sensing data.

[0127] The time correlation module 630 is configured to analyze the time correlation degree of the start and end time of the breakage of the target roof strata and the start and end time of the pressure of the coal mining face, and determine the correlation degree coefficient.

[0128] The dominant horizon judgment module 640 is configured to determine the target roof strata as the dominant horizon when the correlation degree coefficient is greater than or equal to the first preset threshold.

[0129] The target roof strata is one or more roof strata in the coal mining face to be monitored. The first sensing data is the longitudinal displacement data collected by the first sensing module during the breakage of each roof strata. The second sensing data is the pressure data collected by the second sensing module arranged on the support column of the coal mining face during the breakage of each roof strata.

[0130] Specifically, the breakage feature acquisition module 610, the pressure feature acquisition module 620, the time correlation module 630 and the dominant horizon judgment module 640 are sequentially electrically connected.

[0131] The breaking feature acquisition module 610 can obtain the longitudinal displacement variation trend of each roof rock layer from the coal seam to the surface in the breaking subsidence process with time after the first sensing data is preprocessed by time stamp alignment, parameter completion, mean value supplement, and abnormal value elimination, etc., so as to determine the breaking start and end time of the corresponding roof rock layer.

[0132] The coming pressure feature acquisition module 620 can obtain the pressure variation trend of the support of the coal mining face with time in the process of the breaking subsidence of each roof rock layer by layer, so as to determine the coming pressure start and end time of the coal mining face corresponding to the strong pressure perceived by each rock layer breaking.

[0133] The time correlation module 630 compares and analyzes the coincidence degree between the breaking start and end time of the target roof rock layer and the coming pressure start and end time of the coal mining face based on the characteristics that the strong mine pressure dominant layer has a high degree of participation in the strong coming pressure time of the working face, and calculates the correlation degree coefficient between the rock layer breaking and the coming pressure of the working face.

[0134] The dominant layer position judgment module 640 compares and analyzes the correlation degree coefficient and the first preset threshold value:

[0135] If the correlation degree coefficient is greater than or equal to the first preset threshold value, that is, the target roof rock layer is highly coincident with the continuous strong coming pressure stage of the working face in the breaking subsidence stage, the target roof rock layer is a thick and hard roof rock layer, and a relatively large time cost is needed to complete the breaking in the whole breaking process. Therefore, the target roof rock layer is determined as the dominant layer position.

[0136] On the contrary, if the correlation degree coefficient is less than the first preset threshold value, that is, the target roof rock layer is not coincident with the continuous strong coming pressure stage of the working face in the breaking subsidence stage, the target roof rock layer is determined as a non-dominant layer position.

[0137] Optionally, the device further comprises a dominant rock layer range determination module, wherein:

[0138] The dominant rock layer range determination module is configured to determine the dominant rock layer range based on each roof rock layer from the coal mining face to the surface in the case that the breaking energy level data in the third sensing data is greater than or equal to the second preset threshold value.

[0139] The third sensing data is microseismic data collected by a third sensing module arranged on the coal mining face in the breaking process of each roof rock layer.

[0140] Optionally, the device further comprises a microseismic data extraction module and a target roof rock layer determination module, wherein:

[0141] The microseismic data extraction module is configured to extract target microseismic data corresponding to the target time period from the third sensing data.

[0142] The target top roof stratum determination module is configured to filter the target top roof stratum from the various dominant stratum ranges based on the target microseismic data.

[0143] The target time period is determined from the end of the previous pressure on the coal mining face to the end of the current pressure.

[0144] Optionally, the time correlation module 630 includes a break duration determination unit, a pressure duration determination unit, and a correlation degree coefficient determination unit, wherein:

[0145] The break duration determination unit is configured to determine the break duration based on the break start and end times of the target top roof stratum.

[0146] The pressure duration determination unit is configured to determine the pressure duration based on the pressure start and end times of the coal mining face.

[0147] The correlation degree coefficient determination unit is configured to determine the correlation degree coefficient based on the break duration and the pressure duration.

[0148] Optionally, the break feature acquisition module 610 includes a displacement change rate determination unit and a break start and end time determination unit, wherein:

[0149] The displacement change rate determination unit is configured to determine the displacement change rate based on the first sensing data.

[0150] The break start and end time determination unit is configured to determine the break start and end times of each top roof stratum based on the displacement change rate.

[0151] The strong roof pressure dominant layer position determination device provided by the embodiments of the present application is used to execute the strong roof pressure dominant layer position determination method of the present application, and its implementation manner is consistent with that of the strong roof pressure dominant layer position determination method of the present application, and the same beneficial effects can be achieved, which will not be described here.

[0152] The embodiments of the present application determine the break start and end times of each top roof stratum based on the first sensing data, and determine the pressure start and end times of the coal mining face based on the second sensing data, and calculate the time coincidence degree of the break of the target top roof stratum and the pressure of the working face, and determine whether the target top roof stratum is the dominant layer position according to the correlation degree coefficient obtained by calculation. From the perspective of time correlation of roof break and working face pressure, the strong pressure dominant layer position is accurately selected and determined, and then favorable technical support is provided for working face strong pressure disaster mechanism research and on-site engineering management.

[0153] Figure 7is a structural schematic diagram of a strong roof strata dominant horizon determination system provided by the present application. On the basis of any of the above embodiments, as shown in Figure 7 The system comprises a first sensing module 710 arranged in a to-be-detected mining face, a second sensing module 720 arranged on each support column of the coal mining face, and a remote terminal 730 for executing a strong roof strata dominant horizon determination method.

[0154] The first sensing module 710 is configured to send the collected longitudinal displacement data as first sensing data to the remote terminal 730 during the breaking of each roof strata.

[0155] The second sensing module 720 is configured to send the collected pressure data on each support column of the coal mining face as second sensing data to the remote terminal 730 during the breaking of each roof strata.

[0156] Specifically, the strong roof strata dominant horizon determination system is composed of the remote terminal 730 in communication connection with the first sensing module 710 for monitoring the displacement of the strata and the second sensing module 720 for monitoring the support working resistance.

[0157] According to the geological columnar graph information, a borehole is installed for the displacement meter, and the second sensing module 720 (for example, a high-precision displacement sensor) is installed in the borehole according to the spatial distribution characteristics of the roof strata to monitor and record the whole process of the strata caving in real time.

[0158] According to the position difference of the displacement meter borehole construction, the displacement monitoring mode can be divided into two modes: underground displacement monitoring and ground displacement monitoring.

[0159] The underground displacement monitoring refers to the monitoring process of drilling from the coal seam to the ground.

[0160] The ground displacement monitoring refers to the monitoring process of vertical drilling from the coal seam to the ground.

[0161] In addition, the communication connection between the remote terminal 730 and the first sensing module 710 and the second sensing module 720 includes wired communication technology and wireless communication technology.

[0162] The wired communication technology includes but is not limited to serial port, data line, etc., and the embodiments of the present application do not make specific limitations thereon.

[0163] The wireless communication technology includes but is not limited to WIFI wireless cellular signal (2G, 3G, 4G, 5G), Bluetooth, Zigbee, etc., and the embodiments of the present application do not make specific limitations thereon.

[0164] Preferably, in addition to the arrangement of the first sensing module 710 and the second sensing module 720, a third sensing module for microseismic monitoring is arranged on the coal mining face. The second sensing module 720 and the third sensing module are the main input equipment in the implementation process of the present application, and the above sensing modules do not directly generate loss due to data acquisition during use and can be repeatedly used as the coal mining face advances.

[0165] Therefore, the implementation process of the present application has the characteristics of high equipment reusability, low use cost and convenient large-scale repeated use in a mine, thereby being beneficial to comprehensively mastering the strong mine pressure roof dominant layer information of different geological blocks and different mining stages of the same working face.

[0166] In the embodiment of the present application, the breaking start and end times of each roof stratum are determined based on the first sensing data, the weighting start and end times of the coal mining face are determined based on the second sensing data, the start and end times of the target roof stratum breaking and the weighting of the working face are calculated in terms of time coincidence, and whether the target roof stratum is the dominant layer is determined according to the size of the correlation degree coefficient obtained by calculation. The strong mine pressure dominant layer is accurately screened and determined from the perspective of time correlation of roof breaking and weighting of the working face, thereby providing favorable technical support for the research on the strong mine pressure disaster mechanism of the working face and the on-site engineering management.

[0167] Figure 8 An example of a schematic diagram of the physical structure of an electronic device is shown in Figure 8 As shown, the electronic device can include a processor 810, a communications interface 820, a memory 830, and a communications bus 840, wherein the processor 810, the communications interface 820, and the memory 830 complete mutual communication through the communications bus 840. The processor 810 can invoke a logical instruction in the memory 830 to execute a strong mine pressure roof dominant layer determination method, which includes: determining the breaking start and end times of each roof stratum of the coal mining face to the ground in a to-be-monitored coal face based on first sensing data; determining the weighting start and end times of the coal mining face based on second sensing data; performing time correlation analysis on the breaking start and end times of the target roof stratum and the weighting start and end times of the coal mining face to determine a correlation degree coefficient; in the case where the correlation degree coefficient is greater than or equal to a first preset threshold, determining that the target roof stratum is the dominant layer; wherein the target roof stratum is one or more roof strata in the to-be-monitored coal face; the first sensing data is longitudinal displacement data collected by the first sensing module during the breaking of each roof stratum; and the second sensing data is pressure data collected by the second sensing module arranged on each support column of the coal mining face during the breaking of each roof stratum.

[0168] In addition, the logic instructions in the memory 830 described above can be implemented in the form of software functional units and sold or used as independent products, and can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0169] In another aspect, the present application also provides a computer program product, which comprises a computer program, the computer program can be stored on a non-transitory computer readable storage medium, and the computer program can be executed by a processor, so that the computer can execute the strong roof dominant horizon determination method provided by the above-mentioned method. The method comprises: determining the breaking start and end time of each roof rock layer from the coal mining face to the ground of the to-be-monitored mining face based on first sensing data; determining the pressure coming start and end time of the coal mining face based on second sensing data; performing time correlation degree analysis on the breaking start and end time of the target roof rock layer and the pressure coming start and end time of the coal mining face to determine a correlation degree coefficient; in the case where the correlation degree coefficient is greater than or equal to a first preset threshold, determining that the target roof rock layer is the dominant horizon; wherein the target roof rock layer is one or more roof rock layers in the to-be-monitored mining face; the first sensing data is the longitudinal displacement data collected by the first sensing module during the breaking process of each roof rock layer; and the second sensing data is the pressure data collected by the second sensing module arranged on each support column of the coal mining face during the breaking process of each roof rock layer.

[0170] In yet another aspect, the application also provides a non-transitory computer readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the strong roof dominant horizon determination method provided by the above method, and the method comprises: determining the breaking start and end times of each roof stratum from the coal mining face to the surface of the to-be-monitored mining face based on first sensing data; determining the pressure start and end times of the coal mining face based on second sensing data; performing time correlation degree analysis on the breaking start and end times of the target roof stratum and the pressure start and end times of the coal mining face to determine a correlation degree coefficient; and determining the target roof stratum as the dominant horizon in a case where the correlation degree coefficient is greater than or equal to a first preset threshold; wherein the target roof stratum is one or more roof strata in the to-be-monitored mining face; the first sensing data is longitudinal displacement data collected by a first sensing module during the breaking process of each roof stratum; and the second sensing data is pressure data collected by a second sensing module arranged on each support column of the coal mining face during the breaking process of each roof stratum.

[0171] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e., can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0172] From the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be realized by means of software and the necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the method described in each embodiment or some parts of the embodiment.

[0173] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A method for determining the dominant stratum of a strong ore-burdened roof, characterized in that, include: Based on the first sensor data, the start and end times of the fracture of each roof stratum from the coal mining face to the surface of the mine to be monitored are determined. Based on the second sensor data, the start and end times of the pressure on the coal mining face are determined; A time correlation analysis was performed on the start and end times of the fracture of the target roof strata and the start and end times of the pressure on the coal mining face to determine the correlation coefficient. The time correlation analysis of the start and end times of the fracture of the target roof strata and the start and end times of the pressure on the coal face is performed to determine the correlation coefficient, including: The duration of the fracture is determined based on the start and end times of the fracture of the target top rock layer; The duration of the pressure is determined based on the start and end times of the pressure at the coal mining face. The correlation coefficient is determined based on the duration of the fracture and the duration of the pressure. If the correlation coefficient is determined to be greater than or equal to a first preset threshold, the target roof stratum is identified as the dominant stratum. Wherein, the target roof rock layer is one or more roof rock layers in the mining face to be monitored; the first sensing data is the longitudinal displacement data collected by the first sensing module during the fracturing process of each roof rock layer; the second sensing data is the pressure data collected by the second sensing module deployed on each support column of the coal mining face during the fracturing process of each roof rock layer.

2. The method for determining the dominant stratum of a strong ore-pressured roof according to claim 1, characterized in that, Before determining the start and end times of the fracture of each roof stratum from the coal face to the surface based on the first sensor data, the method further includes: If the fracture energy level data in the third sensor data is determined to be greater than or equal to the second preset threshold, the range of the dominant rock strata is determined based on the roof rock strata from the coal mining face to the surface. The third sensing data refers to the microseismic data collected by the third sensing module deployed on the coal mining face during the fracturing of each roof stratum.

3. The method for determining the dominant stratum of a strong ore-burdened roof according to claim 2, characterized in that, After determining the start and end times of the pressure on the coal mining face based on the second sensor data, the method further includes: Extract the target microseismic data corresponding to the target time period from the third sensing data; Based on the target microseismic data, the target top rock layer is selected from each of the dominant rock layer ranges; The target time period is determined from the end of one pressure application on the coal mining face to the end of the current pressure application.

4. The method for determining the dominant stratum of a strong ore-burdened roof according to claim 1, characterized in that, The determination of the start and end times of fracture of each roof stratum from the coal face to the surface based on the first sensor data includes: Based on the first sensing data, determine the rate of displacement change; Based on the displacement change rate, the start and end times of fracture of each top stratum are determined.

5. A device for determining the dominant stratum of a strong ore-burdened roof, characterized in that, include: The fracture feature acquisition module is used to determine the start and end times of fracture of each roof stratum from the coal mining face to the surface of the mine to be monitored, based on the first sensor data. The pressure feature acquisition module is used to determine the start and end times of pressure on the coal mining face based on the second sensor data. The time correlation module is used to perform time correlation analysis on the start and end times of the fracture of the target roof strata and the start and end times of the pressure on the coal mining face, and to determine the correlation coefficient. The time association module is specifically used for: The duration of the fracture is determined based on the start and end times of the fracture of the target top rock layer; The duration of the pressure is determined based on the start and end times of the pressure at the coal mining face. The correlation coefficient is determined based on the duration of the fracture and the duration of the pressure. The dominant stratum determination module is used to determine the target roof stratum as the dominant stratum when the correlation coefficient is greater than or equal to a first preset threshold. Wherein, the target roof rock layer is one or more roof rock layers of the mine face to be monitored; the first sensing data is the longitudinal displacement data collected by the first sensing module during the fracture process of each roof rock layer; The second sensing data is the pressure data collected by the second sensing modules installed on the support columns of each coal mining face during the fracturing of each roof stratum.

6. A system for determining the dominant strata of a strong ore-burdened roof, characterized in that, include: The first sensing module is deployed in the mining face to be tested, the second sensing module is deployed on each support column of the coal mining face, and the remote terminal is used to execute the method for determining the dominant stratum of the strong mine roof as described in any one of claims 1 to 4. The first sensing module is used to send the collected longitudinal displacement data as the first sensing data to the remote terminal during the fracture process of each roof rock layer; The second sensing module is used to send the pressure data collected on each support column of the coal mining face as second sensing data to the remote terminal during the fracturing of each roof stratum.

7. 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 program, it implements the method for determining the dominant stratum of the strong ore-pressure roof as described in any one of claims 1 to 4.

8. 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 dominant stratum of the strong ore-pressure roof as described in any one of claims 1 to 4.

9. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for determining the dominant stratum of the strong ore-pressure roof as described in any one of claims 1 to 4.

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