Method for extracting space-time fusion features of mine pressure appearance of uphill section of valley area

Abstract

The invention discloses a valley area upslope section mine pressure display space-time fusion feature extraction method. The method comprises the steps that firstly, the minimum support working resistance needed for controlling roof periodic weighting under the main key layer missing state in valley area upslope section area mining is obtained; 2, acquiring mine pressure monitoring data and performing feature fusion according to monitoring time and tunneling distance; 3, clustering by using a DBSCAN algorithm to obtain a high-pressure mine pressure display region of an upslope section of the valley region; and 4, obtaining the weighting step pitch of the mine pressure of the upslope section of the valley area. The method is simple in step and reasonable in design, based on the monitoring time and tunneling distance feature fusion data, the high-pressure area of the upslope section of the gully area is obtained through clustering by means of the DBSCAN algorithm, effective early warning and timely emergency measures can be conveniently taken for the high-pressure area, the monitoring time and tunneling distance feature fusion data are judged, and the high-pressure area of the gully area is obtained. And the weighting step pitch of the mine pressure of the upslope section of the valley area is obtained, so that the space-time evolution characteristics of the mine pressure display can be comprehensively considered.

Description

Technical Field

[0001] The invention belongs to the technical field of mine pressure manifestation analysis, and specifically relates to a method for extracting spatiotemporal fusion features of mine pressure manifestation in an uphill section of a valley area. Background Art

[0002] Mine pressure manifestation is a stress and deformation phenomenon that is widely present in the mining process. It is usually accompanied by violent energy release, deformation and destruction of coal and rock masses. Especially in the mining of shallow coal seams in the uphill section of the valley area, mine pressure manifestation is characterized by suddenness and strong destructiveness. This phenomenon not only poses a great threat to mine mining safety, but also seriously restricts the efficient mining and safe production of coal resources. In the process of coal seam mining, due to the stress changes in the rock strata, mine pressure manifestation often manifests as local stress concentration, resulting in the rupture, fall or slip of the coal or rock mass, which in turn affects the ventilation, equipment stability and working environment of the mine.

[0003] Existing methods for extracting features of mine pressure manifestation mainly rely on the analysis of some single factors in the mining environment, such as the geological properties of coal seams, mining depth, and mining progress. They are usually based on static data and ignore the temporal and spatial variation characteristics of mine pressure manifestation. Mine pressure manifestation is not only affected by the geological environment, but also by the dynamic changes of mine operations. Especially in the complex shallow coal mining environment, mine pressure manifestation has strong time-varying and spatial concentration. The limitations of existing methods make it difficult to accurately predict the high-pressure area of ​​mine pressure manifestation, resulting in mine managers often facing greater safety hazards in actual operations, and unable to effectively warn and take timely emergency measures.

[0004] Therefore, there is a lack of a simple and reasonably designed spatiotemporal fusion feature extraction method for mine pressure manifestation in the uphill section of the valley area. Based on the data of monitoring time and excavation distance feature fusion, the DBSCAN algorithm is used for clustering to obtain the high-pressure area of ​​mine pressure manifestation in the uphill section of the valley area, which is convenient for effective early warning of the high-pressure area and taking timely emergency measures. The data of monitoring time and excavation distance feature fusion are judged to obtain the pressure step distance of the mine pressure in the uphill section of the valley area, so as to comprehensively consider the spatiotemporal evolution characteristics of mine pressure manifestation. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for extracting the spatiotemporal fusion features of mine pressure manifestation in the uphill section of the valley area in response to the deficiencies in the above-mentioned prior art. The method has simple steps and a reasonable design. Based on the data of the fusion of monitoring time and excavation distance features, the DBSCAN algorithm is used for clustering to obtain the high-pressure area of ​​mine pressure manifestation in the uphill section of the valley area, which is convenient for effective early warning of the high-pressure area and taking timely emergency measures. The data of the fusion of monitoring time and excavation distance features are also judged to obtain the pressure step distance of the mine pressure in the uphill section of the valley area, so as to comprehensively consider the spatiotemporal evolution characteristics of the mine pressure manifestation.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for extracting spatiotemporal fusion features of mine pressure manifestation in the uphill section of a valley area, characterized in that the method comprises the following steps:

[0007] Step 1: Obtain the minimum support working resistance P required to control the periodic pressure of the roof when the main key layer is missing during mining in the uphill section of the valley area:

[0008] Step 2: Obtain the mine pressure monitoring data and perform feature fusion based on the monitoring time and excavation distance:

[0009] The mine pressure monitoring data is feature-fused according to the monitoring time and excavation distance to obtain the hydraulic support working resistance value at each support monitoring point number at each excavation distance;

[0010] Step 3: Use DBSCAN algorithm to cluster and obtain the high-pressure area of ​​the uphill section of the valley area:

[0011] Step 301, using a computer to perform a clustering of the hydraulic support working resistance values ​​at each support monitoring point number at each excavation distance using the DBSCAN algorithm, to obtain each primary clustering cluster and the center point of each primary clustering cluster;

[0012] Step 302: using a computer to take the minimum support working resistance P required for controlling the periodic pressure of the roof in the absence of the main key layer in the uphill section of the valley area as the working resistance threshold, and compare the working resistance value of the hydraulic support corresponding to the center point of each primary cluster with the working resistance threshold. If the working resistance value of the hydraulic support corresponding to the center point of the primary cluster is greater than the working resistance threshold, the center point is recorded as a point to be clustered;

[0013] Step 303: Perform secondary clustering on each to-be-clustered point using a computer and a DBSCAN algorithm to obtain each secondary clustering cluster and the center point of each secondary clustering cluster;

[0014] Step 304: using a computer to count the excavation distance and support monitoring point number corresponding to the center point of each secondary cluster as the high-pressure area of ​​the mine pressure in the uphill section of the valley area;

[0015] Step 4: Obtain the pressure step distance of the uphill section of the valley area:

[0016] The working resistance value of the hydraulic support at each support monitoring point number at each excavation distance is obtained, and the excavation distance between the mine pressure vanishing point and the mine pressure appearing point is recorded as the pressure step distance.

[0017] The above-mentioned method for extracting spatiotemporal fusion features of mine pressure manifestation in the uphill section of the valley area, step 1, the specific process is as follows:

[0018] Step 101: According to the formula The load P1 on the key block B1 of the sub-key layer is obtained; among them, h4 is the thickness of the interlayer block between the sub-key layer and the main key layer, L1 is the length of the key block B1 of the sub-key layer, h1 is the thickness of the sub-key layer, h5 is the thickness of the main key layer, L5 is the length of the key block B2 of the main key layer, δ is the slope angle of the uphill section, b is the width of the hydraulic support, γ is the average bulk density of the bedrock under the loess layer, h6 is the thickness of the loess layer at the breaking point of the main key layer; γ1 is the average bulk density of the loess layer;

[0019] Step 102: According to the formula The force R1 of the key block B1 on the interlayer directly above the top is obtained; where β is the rock fracture angle, θ is the rotation angle of the key block B1, W is the rotation and sinking amount of the key block C1, a1 is the contact surface height between the key block B1 and the key block C1, is the friction factor of the key block end angle;

[0020] Step 103, according to the formula R2=L2h2bγ, obtain the self-weight R2 of the interlayer block; wherein L2 is the length of the interlayer block; h2 is the thickness of the interlayer between the sub-critical layer and the direct top;

[0021] Step 104: According to the formula Get the direct top deadweight R3; where l k is the distance between the support and the top; h3 is the thickness of the direct top, and α is the breaking angle of the direct top;

[0022] Step 105, according to the formula P=R1+R2+R3, obtain the minimum support working resistance P required for controlling the periodic pressure of the roof when the main key layer is missing during mining in the uphill section of the valley area.

[0023] The above-mentioned method for extracting spatiotemporal fusion features of mine pressure manifestation in the uphill section of the valley area, step 2, the specific process is as follows:

[0024] Step 201, using a mine pressure monitoring system to monitor the mine working face, and obtaining the hydraulic support working resistance value at each support monitoring point number at the i-th monitoring time; wherein i is a positive integer;

[0025] Step 202: At the ith monitoring time, the current excavation distance Li is obtained, and the ith monitoring time and the excavation distance Li are subjected to feature fusion to obtain the hydraulic support working resistance value at each support monitoring point number under the excavation distance Li;

[0026] Step 203, repeating steps 201 and 202 for multiple times until the set monitoring time is reached, and obtaining the hydraulic support working resistance value at each support monitoring point number at each excavation distance.

[0027] The above-mentioned method for extracting spatiotemporal fusion features of mine pressure manifestation in the uphill section of the valley area, step 5, the specific process is as follows:

[0028] Step 401: Compare the working resistance value of the hydraulic support at each support monitoring point number under the previous excavation distance with By comparison, if the working resistance value of the hydraulic support at any support monitoring point number under the previous excavation distance is greater than This indicates that the mine pressure is evident;

[0029] Step 402: During the coal seam excavation process in the mine, if the hydraulic support working resistance values ​​at the monitoring point numbers of each support under the current excavation distance are not greater than This means that the mine pressure disappears, and the excavation distance is recorded as the mine pressure disappearance point;

[0030] Step 403: During the continuous excavation and mining of the coal seam in the mine, if the hydraulic support working resistance value at any support monitoring point number under the next excavation distance is greater than This indicates that the mine pressure is present; and the excavation distance is recorded as the mine pressure presenting point;

[0031] Step 404: record the excavation distance between the mine pressure vanishing point and the mine pressure appearing point as the incoming pressure step distance;

[0032] Step 405, repeating steps 402 to 404 multiple times to obtain various pressure step distances, and record them as periodic pressure step distances.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] 1. The method of the present invention has simple steps and reasonable design, and is convenient for solving the problem of mining pressure manifestation and extraction.

[0035] 2. The present invention integrates the monitoring time and excavation distance to obtain the hydraulic support working resistance value at each support monitoring point number at each excavation distance, thereby integrating the physical and mechanical characteristics and time series of the mine pressure manifestation and providing a more explainable prediction result.

[0036] 3. The present invention uses DBSCAN algorithm clustering to obtain the high-pressure area where the mine pressure appears in the uphill section of the valley area. By extracting the area where the mine pressure appears, it is helpful to take effective emergency measures before the mine pressure appears and reduce the probability of accidents.

[0037] 4. The invention extracts the high-pressure area and periodic pressure step distance of the mine pressure manifestation, so as to better understand the occurrence mechanism of the mine pressure manifestation, thereby providing a scientific basis for practical decision-making.

[0038] In summary, the method of the present invention has simple steps and reasonable design. Based on the data of fusion of monitoring time and excavation distance characteristics, the DBSCAN algorithm is used for clustering to obtain the high-pressure area where the mine pressure appears in the uphill section of the valley area, which is convenient for effective early warning of the high-pressure area and taking timely emergency measures. The data of fusion of monitoring time and excavation distance characteristics are also judged to obtain the pressure step distance of the mine pressure in the uphill section of the valley area, so as to comprehensively consider the spatiotemporal evolution characteristics of the mine pressure.

[0039] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The figure is a flowchart of the method of the present invention.

[0041] Figure 2 It is a schematic diagram of the main key layer missing state when the main key layer is missing during mining in the uphill section of the valley area of ​​the present invention. DETAILED DESCRIPTION

[0042] like Figure 1 As shown, the spatiotemporal fusion feature extraction method of the mine pressure manifestation in the uphill section of the valley area of ​​the present invention comprises the following steps:

[0043] Step 1: Obtain the minimum support working resistance P required to control the periodic pressure of the roof when the main key layer is missing during mining in the uphill section of the valley area:

[0044] Step 2: Obtain the mine pressure monitoring data and perform feature fusion based on the monitoring time and excavation distance:

[0045] The mine pressure monitoring data is feature-fused according to the monitoring time and excavation distance to obtain the hydraulic support working resistance value at each support monitoring point number at each excavation distance;

[0046] Step 3: Use DBSCAN algorithm to cluster and obtain the high-pressure area of ​​the uphill section of the valley area:

[0047] Step 301, using a computer to perform a clustering of the hydraulic support working resistance values ​​at each support monitoring point number at each excavation distance using the DBSCAN algorithm, to obtain each primary clustering cluster and the center point of each primary clustering cluster;

[0048] Step 302: using a computer to take the minimum support working resistance P required for controlling the periodic pressure of the roof in the absence of the main key layer in the uphill section of the valley area as the working resistance threshold, and compare the working resistance value of the hydraulic support corresponding to the center point of each primary cluster with the working resistance threshold. If the working resistance value of the hydraulic support corresponding to the center point of the primary cluster is greater than the working resistance threshold, the center point is recorded as a point to be clustered;

[0049] Step 303: Perform secondary clustering on each to-be-clustered point using a computer and a DBSCAN algorithm to obtain each secondary clustering cluster and the center point of each secondary clustering cluster;

[0050] Step 304: using a computer to count the excavation distance and support monitoring point number corresponding to the center point of each secondary cluster as the high-pressure area of ​​the mine pressure in the uphill section of the valley area;

[0051] Step 4: Obtain the pressure step distance of the uphill section of the valley area:

[0052] The working resistance value of the hydraulic support at each support monitoring point number at each excavation distance is obtained, and the excavation distance between the mine pressure vanishing point and the mine pressure appearing point is recorded as the pressure step distance.

[0053] like Figure 2 As shown, in this embodiment, step one, the specific process is as follows:

[0054] Step 101: According to the formula The load P1 on the key block B1 of the sub-key layer is obtained; among them, h4 is the thickness of the interlayer block between the sub-key layer and the main key layer, L1 is the length of the key block B1 of the sub-key layer, h1 is the thickness of the sub-key layer, h5 is the thickness of the main key layer, L5 is the length of the key block B2 of the main key layer, δ is the slope angle of the uphill section, b is the width of the hydraulic support, γ is the average bulk density of the bedrock under the loess layer, h6 is the thickness of the loess layer at the breaking point of the main key layer; γ1 is the average bulk density of the loess layer;

[0055] Step 102: According to the formula The force R1 of the key block B1 on the interlayer directly above the top is obtained; where β is the rock fracture angle, θ is the rotation angle of the key block B1, W is the rotation and sinking amount of the key block C1, a1 is the contact surface height between the key block B1 and the key block C1, is the friction factor of the key block end angle;

[0056] Step 103, according to the formula R2=L2h2bγ, obtain the self-weight R2 of the interlayer block; wherein L2 is the length of the interlayer block; h2 is the thickness of the interlayer between the sub-critical layer and the direct top;

[0057] Step 104: According to the formula Get the direct top deadweight R3; where l k is the distance between the support and the top; h3 is the thickness of the direct top, and α is the breaking angle of the direct top;

[0058] Step 105, according to the formula P=R1+R2+R3, obtain the minimum support working resistance P required for controlling the periodic pressure of the roof when the main key layer is missing during mining in the uphill section of the valley area.

[0059] In this embodiment, step 2, the specific process is as follows:

[0060] Step 201, using a mine pressure monitoring system to monitor the mine working face, and obtaining the hydraulic support working resistance value at each support monitoring point number at the i-th monitoring time; wherein i is a positive integer;

[0061] Step 202: At the ith monitoring time, the current excavation distance Li is obtained, and the ith monitoring time and the excavation distance Li are subjected to feature fusion to obtain the hydraulic support working resistance value at each support monitoring point number under the excavation distance Li;

[0062] Step 203, repeating steps 201 and 202 for multiple times until the set monitoring time is reached, and obtaining the hydraulic support working resistance value at each support monitoring point number at each excavation distance.

[0063] In this embodiment, step five, the specific process is as follows:

[0064] Step 401: Compare the working resistance value of the hydraulic support at each support monitoring point number under the previous excavation distance with By comparison, if the working resistance value of the hydraulic support at any support monitoring point number under the previous excavation distance is greater than This indicates that the mine pressure is evident;

[0065] Step 402: During the coal seam excavation process in the mine, if the hydraulic support working resistance values ​​at the monitoring point numbers of each support under the current excavation distance are not greater than This means that the mine pressure disappears, and the excavation distance is recorded as the mine pressure disappearance point;

[0066] Step 403: During the continuous excavation and mining of the coal seam in the mine, if the hydraulic support working resistance value at any support monitoring point number under the next excavation distance is greater than This indicates that the mine pressure is present; and the excavation distance is recorded as the mine pressure presenting point;

[0067] Step 404: record the excavation distance between the mine pressure vanishing point and the mine pressure appearing point as the incoming pressure step distance;

[0068] Step 405, repeating steps 402 to 404 multiple times to obtain various pressure step distances, and record them as periodic pressure step distances.

[0069] In this embodiment, the monitoring time value is set to 1 day in step 203. In actual use, it can be adjusted according to requirements.

[0070] In this embodiment, when it is implemented, the friction factor of the key block end angle is is 0.5.

[0071] In this embodiment, during specific implementation, the time between two adjacent monitorings is 10 minutes.

[0072] In this embodiment, it should be noted that the interlayer block is a block formed by interlayer fracture.

[0073] In this embodiment, it should be noted that the center point of a cluster refers to a point with the smallest distance from other points in the cluster.

[0074] In this embodiment, in actual use, the DBSCAN algorithm, namely the Density-Based Spatial Clustering of Applications with Noise algorithm, is a density-based clustering algorithm.

[0075] In this embodiment, in actual use, when the DBSCAN algorithm is used for primary and secondary clustering, the distance threshold epsilon is 0.5, and the minimum point threshold minPoints is 5.

[0076] In summary, the method of the present invention has simple steps and reasonable design. Based on the data of fusion of monitoring time and excavation distance characteristics, the DBSCAN algorithm is used for clustering to obtain the high-pressure area where the mine pressure appears in the uphill section of the valley area, which is convenient for effective early warning of the high-pressure area and taking timely emergency measures. The data of fusion of monitoring time and excavation distance characteristics are also judged to obtain the pressure step distance of the mine pressure in the uphill section of the valley area, so as to comprehensively consider the spatiotemporal evolution characteristics of the mine pressure.

[0077] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for extracting spatiotemporal fusion features of mine pressure manifestation in uphill sections of valley areas, characterized in that: The method comprises the following steps: Step 1: Obtain the minimum support working resistance P required to control the periodic pressure of the roof when the main key layer is missing during mining in the uphill section of the valley area: Step 2: Obtain the mine pressure monitoring data and perform feature fusion based on the monitoring time and excavation distance: The mine pressure monitoring data is feature-fused according to the monitoring time and excavation distance to obtain the hydraulic support working resistance value at each support monitoring point number at each excavation distance; Step 3: Use DBSCAN algorithm to cluster and obtain the high-pressure area of ​​the uphill section of the valley area: Step 301, using a computer to perform a clustering of the hydraulic support working resistance values ​​at each support monitoring point number at each excavation distance using the DBSCAN algorithm, to obtain each primary clustering cluster and the center point of each primary clustering cluster; Step 302: using a computer to take the minimum support working resistance P required for controlling the periodic pressure of the roof in the absence of the main key layer in the uphill section of the valley area as the working resistance threshold, and compare the working resistance value of the hydraulic support corresponding to the center point of each primary cluster with the working resistance threshold. If the working resistance value of the hydraulic support corresponding to the center point of the primary cluster is greater than the working resistance threshold, the center point is recorded as a point to be clustered; Step 303: Perform secondary clustering on each to-be-clustered point using a computer and a DBSCAN algorithm to obtain each secondary clustering cluster and the center point of each secondary clustering cluster; Step 304: using a computer to count the excavation distance and support monitoring point number corresponding to the center point of each secondary cluster as the high-pressure area of ​​the mine pressure in the uphill section of the valley area; Step 4: Obtain the pressure step distance of the uphill section of the valley area: The working resistance value of the hydraulic support at each support monitoring point number at each excavation distance is obtained, and the excavation distance between the mine pressure vanishing point and the mine pressure appearing point is recorded as the pressure step distance.

2. A method for extracting spatiotemporal fusion features of mine pressure manifestation in uphill sections of valley areas according to claim 1, characterized in that: Step 1: The specific process is as follows: Step 101: According to the formula The load P1 on the key block B1 of the sub-key layer is obtained; among them, h4 is the thickness of the interlayer block between the sub-key layer and the main key layer, L1 is the length of the key block B1 of the sub-key layer, h1 is the thickness of the sub-key layer, h5 is the thickness of the main key layer, L5 is the length of the key block B2 of the main key layer, δ is the slope angle of the uphill section, b is the width of the hydraulic support, γ is the average bulk density of the bedrock under the loess layer, h6 is the thickness of the loess layer at the breaking point of the main key layer; γ1 is the average bulk density of the loess layer; Step 102: According to the formula The force R1 of the key block B1 on the interlayer directly above the top is obtained; where β is the rock fracture angle, θ is the rotation angle of the key block B1, W is the rotation and sinking amount of the key block C1, a1 is the contact surface height between the key block B1 and the key block C1, is the friction factor of the key block end angle; Step 103, according to the formula R2=L2h2bγ, obtain the self-weight R2 of the interlayer block; wherein L2 is the length of the interlayer block; h2 is the thickness of the interlayer between the sub-critical layer and the direct top; Step 104: According to the formula Get the direct top deadweight R3; where l k is the distance between the support and the top; h3 is the thickness of the direct top, and α is the breaking angle of the direct top; Step 105, according to the formula P=R1+R2+R3, obtain the minimum support working resistance P required for controlling the periodic pressure of the roof when the main key layer is missing during mining in the uphill section of the valley area.

3. A method for extracting spatiotemporal fusion features of mine pressure manifestation in uphill sections of valley areas according to claim 1, characterized in that: Step 2: The specific process is as follows: Step 201, using a mine pressure monitoring system to monitor the mine working face, and obtaining the hydraulic support working resistance value at each support monitoring point number at the i-th monitoring time; wherein i is a positive integer; Step 202: At the ith monitoring time, the current excavation distance Li is obtained, and the ith monitoring time and the excavation distance Li are subjected to feature fusion to obtain the hydraulic support working resistance value at each support monitoring point number under the excavation distance Li; Step 203, repeating steps 201 and 202 for multiple times until the set monitoring time is reached, and obtaining the hydraulic support working resistance value at each support monitoring point number at each excavation distance.

4. A method for extracting spatiotemporal fusion features of mine pressure manifestation in uphill sections of valley areas according to claim 1, characterized in that: Step 5: The specific process is as follows: Step 401: Compare the working resistance value of the hydraulic support at each support monitoring point number under the previous excavation distance with By comparison, if the working resistance value of the hydraulic support at any support monitoring point number under the previous excavation distance is greater than This indicates that the mine pressure is evident; Step 402: During the coal seam excavation process in the mine, if the hydraulic support working resistance value at each support monitoring point number under the current excavation distance is not greater than If the working resistance values ​​of the hydraulic supports at the monitoring point numbers of each support under the current excavation distance are not greater than This means that the mine pressure disappears, and the excavation distance is recorded as the mine pressure disappearance point; Step 403: During the continuous excavation and mining of the coal seam in the mine, if the hydraulic support working resistance value at any support monitoring point number under the next excavation distance is greater than This indicates that the mine pressure is present; and the excavation distance is recorded as the mine pressure presenting point; Step 404: record the excavation distance between the mine pressure vanishing point and the mine pressure appearing point as the incoming pressure step distance; Step 405, repeating steps 402 to 404 multiple times to obtain various pressure step distances, and record them as periodic pressure step distances.

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