Overburden deformation coordination control method and device for fully mechanized mining and simultaneous backfilling working face and storage medium

Abstract

This application relates to a method, device, and storage medium for coordinated control of overburden deformation in continuous mining and filling faces. The specific scheme involves: obtaining the height of the strip coal pillars and the preset overburden subsidence value of the target mining area; determining the width of the strip coal pillars and the number of filling rounds in the target mining area; constructing an overburden coordinated deformation model based on the number of filling rounds in the target mining area; obtaining the overburden layer load intensity, uniaxial compressive strength of the coal body, and elastic modulus of the coal body in the target mining area; determining the target elastic modulus of the filling body and the total overburden subsidence based on the strip coal pillar width, strip coal pillar height, overburden layer load intensity, uniaxial compressive strength of the coal body, and preset overburden subsidence value using the overburden coordinated deformation model; and determining the target uniaxial compressive strength of the filling body based on the uniaxial compressive strength of the coal body and the target elastic modulus of the filling body. This application improves the rationality and accuracy of key parameters in coal resource filling and replacement mining.

Description

Technical Field

[0001] This application relates to the field of coal mining technology, and in particular to a method, device and storage medium for coordinated control of overburden deformation in continuous mining and filling working faces. Background Technology

[0002] Among related technologies, continuous mining and filling technology is a replacement and filling mining method. It typically uses filling materials such as paste to replace the coal pillars one by one. During filling, the paste is transported to the side roadway entrance and injected into the sealed side roadway space. By replacing coal with gangue and mining with zero coal pillars, coal resources can be extracted. Paste continuous mining and filling technology is an effective method to release coal pressure from buildings, water bodies, and roads. However, if the key parameters are not designed properly, serious consequences can occur. For example, if the surface subsidence exceeds the allowable value, it can cause deformation and cracking of buildings. In some cases, the production capacity or economic benefits of the mine are lower than expected, or even losses can occur. Summary of the Invention

[0003] Therefore, this application provides a method, device, and storage medium for coordinated control of overburden deformation in continuous mining and filling working faces. The technical solution of this application is as follows:

[0004] According to a first aspect of the embodiments of this application, a method for coordinated control of overburden deformation in a continuous mining and filling working face is provided, wherein the height of the strip coal pillar in the target coal mining area and the preset overburden subsidence value are obtained respectively;

[0005] The width of the strip coal pillar and the number of mining rounds for the target coal mining area are determined respectively;

[0006] The overburden coordination deformation model is determined based on the number of mining rounds in the target coal mining area;

[0007] The load intensity of the overburden strata, the uniaxial compressive strength of the coal body, and the elastic modulus of the coal body in the target coal mining area were obtained respectively.

[0008] Based on the width and height of the strip coal pillar, the load intensity of the overburden layer, the uniaxial compressive strength of the coal body, and the preset overburden subsidence value, the target elastic modulus of the filling body and the total overburden subsidence are determined through the overburden coordinated deformation model.

[0009] The target uniaxial compressive strength of the filling material is determined based on the uniaxial compressive strength of the coal body and the target elastic modulus of the filling material.

[0010] According to one embodiment of this application, determining the overburden coordinated deformation model based on the number of mining rounds in the target coal mining area includes:

[0011] Obtain the load intensity of the overlying rock distribution;

[0012] Based on the width of the strip coal pillar, the intensity of the overburden distribution load, and the number of mining rounds in the target coal mining area, the calculation formula for the overburden subsidence in each round of mining in the target coal mining area is determined respectively.

[0013] Based on the calculation formula for the subsidence of the overburden in each round of mining in the target coal mining area, the calculation formula for the total subsidence of the overburden is determined, and the calculation formula for the total subsidence of the overburden is used as the overburden coordinated deformation model.

[0014] According to one embodiment of this application, the overlying rock coordinated deformation model is specifically as follows:

[0015]

[0016] In this system, the coal seam area to be mined is divided into n supporting strip coal pillars, l is the working face strike length, q is the overburden distribution load intensity, k0 is the stiffness coefficient of a single strip coal pillar, k1 is the stiffness coefficient of a single filling strip, m is the number of mining rounds in the target coal mining area, x1 is the overburden subsidence in the first round of mining, x2 is the overburden subsidence in the second round of mining, x3 is the overburden subsidence in the third round of mining, and x m-1 x represents the subsidence of the overlying strata during the (m-1)th mining round. m This represents the amount of overburden subsidence during the m-th mining round.

[0017] According to one embodiment of this application, the step of determining the target elastic modulus of the filling body and the actual total overburden settlement based on the strip coal pillar width, strip coal pillar height, overburden load intensity, coal body uniaxial compressive strength, and preset overburden settlement value through the overburden coordinated deformation model includes:

[0018] Obtain the preset elastic modulus of the filling material;

[0019] The preset elastic modulus of the filling body, the width of the strip coal pillar, the height of the strip coal pillar, the load intensity of the overburden layer, and the uniaxial compressive strength of the coal body are input into the overburden coordinated deformation model.

[0020] Obtain the total overburden subsidence output by the overburden coordinated deformation model;

[0021] The total subsidence of the overlying strata is compared with the preset subsidence value of the overlying strata to obtain the comparison result;

[0022] In response to the comparison result that the total overburden subsidence is less than or equal to the preset overburden subsidence value, the total overburden subsidence is determined as the actual total overburden subsidence, the width of the strip coal pillar is determined as the target strip coal pillar width, and the preset elastic modulus of the filling body is determined as the target elastic modulus of the filling body.

[0023] In response to the comparison result that the actual total overburden subsidence is greater than the preset overburden subsidence value, the step of determining the width of the strip coal pillar and the number of mining rounds of the target coal mining area is re-executed.

[0024] According to one embodiment of this application, the step of determining the elastic modulus of the filling body and the actual total overburden subsidence based on the width and height of the strip coal pillar, the load intensity of the overburden layer distribution, the uniaxial compressive strength of the coal body, and the preset overburden subsidence value through the overburden coordinated deformation model further includes:

[0025] The preset overburden subsidence value is determined as the maximum total overburden subsidence value;

[0026] The width of the strip coal pillar, the height of the strip coal pillar, the load intensity of the overburden layer, the uniaxial compressive strength of the coal body, and the maximum value of the total overburden subsidence are input into the overburden coordinated deformation model;

[0027] Obtain the target elastic modulus threshold of the filling body output by the overburden coordinated deformation model;

[0028] The target elastic modulus of the filling material is determined based on the target elastic modulus threshold of the filling material.

[0029] According to one embodiment of this application, determining the target uniaxial compressive strength of the filling material based on the uniaxial compressive strength of the coal body and the target elastic modulus of the filling material includes:

[0030] Obtain the uniaxial compressive strength of the coal seam;

[0031] The target uniaxial compressive strength of the filling body is calculated based on the uniaxial compressive strength of the coal body, the elastic modulus of the coal body, the target elastic modulus of the filling body, the width of the strip coal pillar, and the height of the strip coal pillar.

[0032] According to one embodiment of this application, the formula for calculating the target uniaxial compressive strength of the filling body is as follows:

[0033]

[0034] Where σ1 is the uniaxial compressive strength of the filling body; σ0 is the uniaxial compressive strength of the coal body; h is the height of the filling strip; l / n is the width of a single filling strip; E0 is the elastic modulus of the coal body; and E1 is the target elastic modulus of the filling body.

[0035] According to a second aspect of the embodiments of this application, a device for controlling the coordinated deformation of overburden in a continuous mining and filling working face is provided, characterized in that the device comprises:

[0036] The first acquisition module is used to acquire the height of the strip coal pillar and the preset overburden subsidence value of the target coal mining area respectively;

[0037] The first determining module is used to determine the width of the strip coal pillar and the number of mining rounds in the target coal mining area, respectively.

[0038] The second determining module is used to determine the overburden coordinated deformation model based on the number of mining rounds in the target coal mining area;

[0039] The second acquisition module is used to acquire the overburden load intensity, uniaxial compressive strength of coal, and elastic modulus of coal in the target coal mining area, respectively.

[0040] The third determining module is used to determine the target elastic modulus of the filling body and the total amount of overburden settlement based on the width of the strip coal pillar, the height of the strip coal pillar, the load intensity of the overburden layer, the uniaxial compressive strength of the coal body, and the preset overburden settlement value, through the overburden coordinated deformation model.

[0041] The fourth determining module is used to determine the target uniaxial compressive strength of the filling body based on the uniaxial compressive strength of the coal body and the target elastic modulus of the filling body.

[0042] According to a third aspect of the embodiments of this application, an electronic device is provided, including: a processor, and a memory communicatively connected to the processor;

[0043] The memory stores computer-executed instructions;

[0044] The processor executes computer execution instructions stored in the memory to implement the method as described in any one of the first aspects.

[0045] According to a fourth aspect of the embodiments of this application, a computer-readable storage medium is provided, wherein computer-executable instructions are stored therein, which, when executed by a processor, are used to implement the method as described in any one of the first aspects.

[0046] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0047] By using the overburden deformation coordination model, the number of mining rounds, strip coal pillar width, and backfill stiffness of the target coal mining area that can meet the maximum overburden subsidence value are determined. Based on the elastic modulus of the coal body and the target elastic modulus of the backfill, the target uniaxial compressive strength of the backfill is determined, thereby improving the rationality and accuracy of key parameters in coal mining. This effectively controls the total overburden subsidence and avoids problems such as building deformation, cracking, and lower-than-expected mine production capacity or economic benefits caused by excessive overburden subsidence.

[0048] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0049] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application, and do not constitute an undue limitation of this application.

[0050] Figure 1 This is a flowchart illustrating a method for coordinated control of overburden deformation in a continuous mining and filling working face, as described in this application.

[0051] Figure 2 This is a structural block diagram of a coordinating control device for overburden deformation in a continuous mining and filling working face, as described in an embodiment of this application.

[0052] Figure 3 This is a schematic diagram of three rounds of mining and charging in the continuous mining and charging working face in the embodiments of this application;

[0053] Figure 4 This is a schematic diagram of the mechanical model of the mining area to be mined in the embodiments of this application;

[0054] Figure 5 This is a schematic diagram of the mechanical model after the first round of filling in the continuous mining and filling embodiment of this application;

[0055] Figure 6 This is a schematic diagram of the mechanical model after the second round of continuous mining and filling in the embodiments of this application;

[0056] Figure 7 This is a schematic diagram of the mechanical model after the third round of continuous mining and filling in the embodiments of this application;

[0057] Figure 8 This is a block diagram of an electronic device according to an embodiment of this application.

[0058] Figure Labels

[0059] 1-Overburden; 2-Strip coal pillar; 3-Filling strip. Detailed Implementation

[0060] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0061] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0062] It should be noted that continuous mining and backfilling technology differs from longwall backfilling. This technology is a replacement backfilling method, which typically uses backfill materials such as paste to replace the coal pillars one by one. Figure 2 As shown in the diagram, this technology employs a dual-lane continuous operation method. First, the width of the branch roadway is divided according to certain dimensions. Odd-numbered roadways (sections 1, 3, 5, etc.) are mined first, followed by timely backfilling. Once the backfill material reaches the required strength, even-numbered roadways (sections 2, 4, 6, etc.) are mined and backfilled in the same manner, achieving full mining and full backfilling. During backfilling, the paste is transported to the branch roadway entrance and injected into the sealed branch roadway space. Through the method of replacing coal with gangue and zero-coal-pillar mining, coal resources are extracted. The current shortcomings of this method are as follows: (1) The width division of the backfill roadway lacks scientific basis. If the width division of the backfill roadway is too large, the tunneling cross section will be large, and the tunneling machine will need to be moved frequently, resulting in low efficiency of coal mining operations and difficulty in controlling the overburden. If the width division of the backfill roadway is too small, the frequent mining and backfilling operations will cause multiple disturbances to the overburden, which is not conducive to controlling the settlement of the overburden. (2) The strength design of the backfill body lacks scientific basis. The purpose of continuous mining and backfilling is, on the one hand, to safely and economically extract coal resources through backfilling and replacement, and on the other hand, to control surface settlement. If the strength design of the backfill body is not scientific, the strength design of the backfill body will be insufficient. If the strength is too high, the mining cost will be uneconomical; if it is too low, it will be detrimental to the protection of ground structures. Scientific design of filling strength is a major problem. (3) There is a certain degree of blindness in the setting of continuous mining and filling cycles. For example, some mines mine in two rounds, first mining the odd-numbered roadways 1, 3, 5... sections, and then filling them in time. Then, they mine and fill the even-numbered roadways 2, 4, 6... sections in the same way. There are also working faces that are mined in three or four rounds. However, the above schemes are more of an empirical method and have not been reasonably demonstrated from the aspects of safety, economy, efficiency and science.

[0063] It should be noted that overburden refers to rock or soil masses that cover coal seams and have no industrial value. Examples include sandstone and topsoil layers covering coal seams.

[0064] The paste-based continuous mining and filling technology is an effective method for releasing coal pressure from buildings, water bodies, and roads. However, improper design of key parameters can lead to serious consequences. For example, if the surface subsidence exceeds the allowable value, it can cause deformation and cracking of buildings. Some mines may also experience lower-than-expected production capacity or economic benefits, or even losses. Therefore, how to scientifically and rationally determine the width of the replacement strip, the strength of the filling body, and the number of mining cycles has become a critical issue that urgently needs to be addressed.

[0065] Based on the above problems, this application proposes a method, device, and storage medium for coordinated control of overburden deformation in continuous mining and filling working faces. Figure 1 This is a flowchart of a method for coordinated control of overburden deformation in a continuous mining and filling working face, as implemented in this application.

[0066] like Figure 1 As shown, the method for coordinated control of overburden deformation in the continuous mining and filling working face includes:

[0067] Step 110: Obtain the height of the strip coal pillar and the preset overburden subsidence value of the target coal mining area.

[0068] It should be noted that the preset overburden subsidence value can be the maximum value of overburden subsidence set in advance according to actual needs. For example, if the maximum acceptable overburden subsidence value is 150mm based on the mining conditions of the target coal mining area, then the actual overburden subsidence value needs to be controlled below 150mm.

[0069] Step 120: Determine the width of the strip coal pillar and the number of mining rounds for the target coal mining area.

[0070] Step 130: Determine the overburden coordinated deformation model based on the number of mining rounds in the target coal mining area.

[0071] In some embodiments of this application, step 130 includes:

[0072] Step 131: Obtain the load intensity of the overburden distribution;

[0073] Step 132: Based on the width of the strip coal pillar, the overburden distribution load intensity, and the number of mining rounds in the target coal mining area, determine the calculation formula for the overburden subsidence in each round of mining in the target coal mining area.

[0074] It should be noted that during continuous mining and filling, as the strip coal pillars are replaced one by one, the stiffness of the support system in the entire filling area gradually decreases, which will lead to surface subsidence. At the same time, the lower the strength of the filling material and the larger the size of the strip coal pillars, the more severe the surface subsidence.

[0075] Understandably, during continuous mining and backfilling, the backfill material needs time to solidify and reach its design strength, as there is a certain time interval between each backfilling round. Under normal circumstances, the overburden subsidence mainly stems from the difference in stiffness between the coal pillar strips and the backfill strips, leading to uncoordinated deformation. If multiple rounds of backfilling are performed, with strict control over the width of the coal pillar strips in each round, and the backfill material reaching its design strength before starting the next round, until all coal pillar strips are completely replaced and mined, the amount of surface subsidence can be controlled.

[0076] Optionally, the filling material may be a mixture of fly ash, gypsum, water and related additives.

[0077] As a possible implementation example, if other parameters remain unchanged, and the filling is carried out in m rounds, then the overall stiffness of the filled area after each round of filling is:

[0078] After the first round of filling, the overall stiffness of the filled area is:

[0079] After the second round of filling, the overall stiffness of the filled area is:

[0080] After the third round of filling, the overall stiffness of the filled area is:

[0081] …

[0082] After the (m-1)th round of filling, the overall stiffness of the filled area is:

[0083] After the m-th round of filling, the overall stiffness of the filled area is: nk1.

[0084] For example, such as Figure 4 As shown, the continuous mining and filling range is defined. Assuming the working face length is l, the coal seam area to be mined is divided into n strip coal pillars for support, as follows: Figure 1 As shown, the width of each strip coal pillar 2 is If the stiffness coefficient of a single strip coal pillar is k0, and the intensity of the overburden load distribution is q, then the overburden load above the working face is ql. According to the principle of adding stiffness in parallel systems, the overall stiffness coefficient of the coal body in this area is... Assume the continuous mining and filling scheme involves three rounds of filling.

[0085] It is understandable that there are multiple rock strata above the coal seam, and these multiple rock strata together are called the overburden.

[0086] After the first round of coal mining and backfilling, such as Figure 5 As shown, 1 / 3 of the strip coal pillars are replaced by filling strips 3, and the number of strip coal pillars 2 in this area is reduced to [number missing]. The number of filling strips 3 is Assuming the stiffness coefficient of a single filling strip is k1, then the overall stiffness of the coal pillar and filling strip in the working face area is: Since the overburden load remains constant, after the first round of filling and replacement, the subsidence of overburden layer 1 is:

[0087] After the second round of coal mining and backfilling of the aforementioned filling body, such as Figure 6 As shown, the number of strip coal pillars 2 in this area was further reduced to The number of filling strips 3 increased to The overall stiffness of the working face area strip coal pillar 2 and filling strip 3 is After the second round of filling and replacement, the subsidence of overburden 1 is:

[0088] After the third round of coal mining and backfilling of the aforementioned filling body, such as Figure 7 As shown, the number of strip coal pillars in this area is completely replaced by n filling strips, and the overall stiffness of the filling area is nk1; after the third round of filling, the subsidence of the overburden 1 is:

[0089] After the (m-1)th round of coal mining and backfilling of the aforementioned backfill body, the settlement of the overburden stratum 1 in the backfill area is:

[0090] After the m-th round of coal mining and backfilling of the aforementioned backfill body, the subsidence of the overburden stratum 1 in the backfill area is:

[0091] Step 133: Based on the calculation formula for the subsidence of the overburden in each round of mining in the target coal mining area, determine the calculation formula for the total subsidence of the overburden, and use the calculation formula for the total subsidence of the overburden as the overburden coordinated deformation model.

[0092] In some embodiments of this application, the overlying rock coordinated deformation model is as follows:

[0093]

[0094] The coal seam to be mined is divided into n strip coal pillars, where l is the working face strike length, q is the overburden distribution load intensity, k0 is the stiffness coefficient of a single strip coal pillar, k1 is the stiffness coefficient of a single filling strip, m is the number of mining rounds in the target coal mining area, x1 is the overburden subsidence in the first round of mining, x2 is the overburden subsidence in the second round of mining, x3 is the overburden subsidence in the third round of mining, and x... m-1 Let x be the amount of overburden subsidence during the m-th round of mining. m This represents the amount of overburden subsidence during the m-th mining round.

[0095] For example, the total subsidence of the overburden replaced by continuous mining is s = (x1 + x2 + x3):

[0096]

[0097] As can be seen from the above formula, the larger the stiffness coefficient of the filling body, the smaller the size of the strip coal pillar, and the smaller the overburden subsidence. The key to controlling overburden subsidence lies in determining a reasonable and scientific size of the strip coal pillar and the stiffness coefficient of the filling body. The stiffness coefficient of the filling body or the stiffness coefficient of the strip coal pillar are closely related to their own physical and mechanical parameters. If the elastic modulus of the coal body is E0 and the elastic modulus of the filling body is E1, then:

[0098]

[0099] Where k0 is the stiffness coefficient of the strip coal pillar and k1 is the stiffness coefficient of the filling body.

[0100] Step 140: Obtain the load intensity of the overburden strata, the uniaxial compressive strength of the coal body, and the elastic modulus of the coal body in the target coal mining area.

[0101] Step 150: Based on the width of the strip coal pillar, the height of the strip coal pillar, the load intensity of the overburden layer distribution, the uniaxial compressive strength of the coal body, and the preset overburden subsidence value, the target elastic modulus of the filling body and the total amount of overburden subsidence are determined through the overburden coordinated deformation model.

[0102] In some embodiments of this application, the proportions of fly ash, gypsum, water, and related additives in the filling material can be determined based on the target elastic modulus of the filling body.

[0103] In some embodiments of this application, step 150 includes:

[0104] Step 1511: Obtain the preset elastic modulus of the filling body;

[0105] Step 1512: Input the preset elastic modulus of the filling body, the width of the strip coal pillar, the height of the strip coal pillar, the load intensity of the overburden layer distribution, and the uniaxial compressive strength of the coal body into the overburden coordinated deformation model.

[0106] For example, a mine working face has a width l = 160m, a burial depth of 38m, a coal seam thickness of 5m, and an average overburden density of 1.5 × 10⁻⁶ m. 3 kg / m 3 The ground structures are industrial plants, and the maximum required surface subsidence is no more than 180mm (i.e., the preset overburden subsidence value). The relevant calculation steps are as follows:

[0107] A1: Based on parameters such as the width l of the continuous mining and filling face, the coal seam depth, and the thickness and unit weight of the strata above the coal seam, the overburden load intensity is calculated to be q = 5.7 × 10⁻⁶. 5 N / m;

[0108] A2: Collect coal samples for laboratory testing to obtain pre-set physical and mechanical parameters such as the elastic modulus of the filling body, the width and height of the coal pillar strips, the load intensity of the overburden strata, and the uniaxial compressive strength of the coal body. The uniaxial compressive strength of the coal body is 15 MPa, and the elastic modulus is 2.5 × 10⁻⁶ MPa. 4 MPa;

[0109] A3: Substitute the above parameters into the aforementioned overburden deformation coordination model, i.e. The bivariate functional relationship between the width of the filling strip l / n (i.e. the width of the coal pillar, which is the same as the width of the filling body) and the stiffness coefficient k1 of the filling strip is obtained.

[0110] As a possible example, different combinations of strip coal pillar widths and stiffness coefficients can be substituted into the above functional relationship to verify the overburden subsidence.

[0111] Step 1513: Obtain the total overburden subsidence output by the overburden coordinated deformation model.

[0112] Step 1514: Compare the total amount of overburden subsidence with the preset overburden subsidence value to obtain the comparison result.

[0113] Step 1515: In response to the comparison result that the total overburden subsidence is less than or equal to the preset overburden subsidence value, the total overburden subsidence is determined as the actual total overburden subsidence, the width of the strip coal pillar is determined as the target strip coal pillar width, and the preset elastic modulus of the filling body is determined as the target elastic modulus of the filling body.

[0114] For example, the aforementioned filling area is divided into 20 strip coal pillars for replacement filling, with each strip coal pillar being 8m wide. Replacement mining is carried out in three rounds, and the stiffness coefficient of the filling body is 2.35×10. 4 N / m, substituting into the above formula, the subsidence of the overburden in each round is x1=0.0473m, x2=0.0513m, x3=0.148m, and the cumulative subsidence of the overburden in the three rounds of filling is x1+x2+x3=0.0473+0.0492+0.0513=0.148m=148mm, which is lower than the preset subsidence value of 180mm and meets the standard requirements.

[0115] Step 1516: In response to the comparison result that the actual total overburden subsidence is greater than the preset overburden subsidence value, the steps of determining the width of the strip coal pillar and the number of mining rounds of the target coal mining area are re-executed.

[0116] As a possible example, if the comparison result shows that the actual total overburden subsidence is greater than the preset overburden subsidence value, it indicates that the current strip coal pillar width and the number of mining rounds in the target coal mining area meet the preset requirements, resulting in the actual total overburden subsidence being greater than the preset overburden subsidence value. Therefore, it is necessary to select a new strip coal pillar width and a new number of mining rounds in the target coal mining area.

[0117] In some embodiments of this application, step 150 further includes:

[0118] Step 1521: Determine the preset overburden subsidence value as the maximum total overburden subsidence value.

[0119] As a possible implementation example, the target elastic modulus of the filling body can be calculated by reverse derivation using the overburden coordinated deformation model based on the maximum total subsidence of the overburden.

[0120] Step 1522: Input the width of the strip coal pillar, the height of the strip coal pillar, the load intensity of the overburden layer distribution, the uniaxial compressive strength of the coal body, and the maximum value of the total overburden subsidence into the overburden coordinated deformation model.

[0121] Step 1523: Obtain the target elastic modulus threshold of the filling body output by the overburden coordinated deformation model.

[0122] For example, if the preset overburden subsidence value is 180mm, the mining cycle is three rounds, and the width of the strip coal pillar is 8m, then the cumulative subsidence of the three rounds of backfilling must meet the following requirements. By inputting the width and height of the strip coal pillar, the load intensity of the overburden strata, the uniaxial compressive strength of the coal body, and the maximum total overburden subsidence into the overburden coordinated deformation model, further calculations show that the stiffness coefficient of the filling body should satisfy k1 ≥ 1.93 × 10⁻⁶. 4 N / m, the subsidence of the overburden in the three rounds of filling, x1, x2 and x3 should be controlled at x1≤56mm, x2≤0.061mm and x3≤0.064mm respectively.

[0123] Step 1524: Determine the target elastic modulus of the filling material based on the target elastic modulus threshold of the filling material.

[0124] According to the stiffness coefficient of the filling body, k1 should satisfy k1 ≥ 1.93 × 10 4 N / m, Finally, the range of values ​​for the target elastic modulus E1 of the filling body can be determined, and a value can be selected from the range of values ​​for the target elastic modulus E1 of the filling body as the threshold value for the target elastic modulus E1 of the filling body.

[0125] Step 160: Determine the target uniaxial compressive strength of the filling material based on the uniaxial compressive strength of the coal body and the target elastic modulus of the filling material.

[0126] In some embodiments of this application, step 160 further includes:

[0127] Step 161: Obtain the uniaxial compressive strength of the coal body.

[0128] Step 162: Calculate the target uniaxial compressive strength of the filling body based on the uniaxial compressive strength of the coal body, the elastic modulus of the coal body, the target elastic modulus of the filling body, the width of the strip coal pillar, and the height of the strip coal pillar.

[0129] It should be noted that the purpose of the backfill is to maintain the strength of the surrounding rock, improve the overall bearing capacity of the support structure, control the instability or collapse of the overburden, and thus maintain the stability of the "backfill strip-overburden" support structure system. The strength of the backfill refers to the maximum load it can withstand per unit area. The strength of the backfill is the key to controlling the movement and deformation of the overburden and the surface during backfill mining. Its strength is affected by many factors such as size, material composition and ratio, roof and floor characteristics, and lateral pressure.

[0130] In some embodiments of this application, the formula for calculating the target uniaxial compressive strength of the filling material is as follows:

[0131]

[0132] Where σ1 is the uniaxial compressive strength of the filling body; σ0 is the uniaxial compressive strength of the coal body; h is the height of the filling strip; l / n is the width of a single filling strip; E0 is the elastic modulus of the coal body; and E1 is the target elastic modulus of the filling body.

[0133] It is understandable that if the uniaxial compressive strength of the filling material in the current round is greater than or equal to σ1, the next round of mining can proceed.

[0134] According to the overburden deformation coordination control method of the continuous mining and filling working face according to the embodiments of this application, the following steps are taken: First, the height of the strip coal pillar in the target mining area and the preset overburden subsidence value are obtained. Second, the width of the strip coal pillar and the number of mining rounds in the target mining area are determined. Third, an overburden coordination deformation model is determined based on the number of mining rounds in the target mining area. Fourth, the overburden layer distributed load intensity, uniaxial compressive strength of the coal body, and elastic modulus of the coal body in the target mining area are obtained. Fifth, based on the strip coal pillar width, strip coal pillar height, overburden layer distributed load intensity, uniaxial compressive strength of the coal body, and preset overburden subsidence value, the target elastic modulus of the filling body and the total overburden subsidence are determined through the overburden coordination deformation model. Sixth, the target uniaxial compressive strength of the filling body is determined based on the uniaxial compressive strength of the coal body and the target elastic modulus of the filling body. By using the overburden deformation coordination model, the number of mining rounds, strip coal pillar width, and backfill stiffness of the target coal mining area that can meet the maximum overburden subsidence value are determined. Based on the elastic modulus of the coal body and the target elastic modulus of the backfill, the target uniaxial compressive strength of the backfill is determined, thereby improving the rationality and accuracy of key parameters in coal mining. This effectively controls the total overburden subsidence and avoids problems such as building deformation, cracking, and lower-than-expected mine production capacity or economic benefits caused by excessive overburden subsidence.

[0135] Figure 2This is a structural block diagram of a device for coordinating deformation control of overburden in a continuous mining and filling working face, as proposed in an embodiment of this application. Figure 2 As shown, the overburden deformation control device for continuous mining and filling working faces includes:

[0136] The first acquisition module 201 is used to acquire the height of the strip coal pillar and the preset overburden subsidence value of the target coal mining area.

[0137] The first determining module 202 is used to determine the width of the strip coal pillar and the number of mining rounds of the target coal mining area, respectively.

[0138] The second determining module 203 is used to determine the overburden coordinated deformation model based on the number of mining rounds in the target coal mining area.

[0139] In some embodiments of this application, the second determining module 203 is specifically used to: obtain the overburden distribution load intensity; determine the overburden subsidence calculation formula for each round of mining in the target coal mining area based on the strip coal pillar width, overburden distribution load intensity, the calculation formula of the preset filling stiffness coefficient, and the calculation formula of the preset coal body stiffness coefficient; determine the total overburden subsidence calculation formula based on the overburden subsidence calculation formula for each round of mining in the target coal mining area, and determine the total overburden subsidence calculation formula as the overburden coordinated deformation model.

[0140] The second acquisition module 204 is used to acquire the overburden load intensity, uniaxial compressive strength of coal, and elastic modulus of coal in the target coal mining area.

[0141] The third determining module 205 is used to determine the target elastic modulus of the filling body and the total amount of overburden settlement based on the width of the strip coal pillar, the height of the strip coal pillar, the load intensity of the overburden layer distribution, the uniaxial compressive strength of the coal body, and the preset overburden settlement value, through the overburden coordinated deformation model.

[0142] In some embodiments of this application, the third determining module 205 is specifically used for: obtaining the preset elastic modulus of the filling body; inputting the preset elastic modulus of the filling body, the width of the strip coal pillar, the height of the strip coal pillar, the load intensity of the overburden layer distribution, and the uniaxial compressive strength of the coal body into the overburden coordinated deformation model; obtaining the total overburden subsidence output by the overburden coordinated deformation model; comparing the total overburden subsidence with the preset overburden subsidence value to obtain a comparison result; in response to the comparison result that the total overburden subsidence is less than or equal to the preset overburden subsidence value, determining the total overburden subsidence as the actual total overburden subsidence, determining the width of the strip coal pillar as the target strip coal pillar width, and determining the preset elastic modulus of the filling body as the target elastic modulus of the filling body; in response to the comparison result that the actual total overburden subsidence is greater than the preset overburden subsidence value, re-executing the steps of determining the width of the strip coal pillar and the number of mining rounds of the target mining area.

[0143] In some embodiments of this application, the third determining module 205 is further configured to: determine the preset overburden subsidence value as the maximum total overburden subsidence value; input the strip coal pillar width, strip coal pillar height, overburden layer distributed load intensity, coal body uniaxial compressive strength and the maximum total overburden subsidence value into the overburden coordinated deformation model; obtain the target elastic modulus threshold of the filling body output by the overburden coordinated deformation model; and determine the target elastic modulus of the filling body based on the target elastic modulus threshold of the filling body.

[0144] The fourth determining module 206 is used to determine the target uniaxial compressive strength of the filling body based on the uniaxial compressive strength of the coal body and the target elastic modulus of the filling body.

[0145] In some embodiments of this application, the fourth determining module 206 is specifically used to: obtain the uniaxial compressive strength of the coal body;

[0146] The target uniaxial compressive strength of the filling body is calculated based on the uniaxial compressive strength of the coal body, the elastic modulus of the coal body, the target elastic modulus of the filling body, the width of the strip coal pillar, and the height of the strip coal pillar.

[0147] According to the embodiment of this application, the overburden deformation coordination control device for continuous mining and filling faces obtains the height of the strip coal pillar and the preset overburden subsidence value of the target coal mining area; determines the width of the strip coal pillar and the number of mining rounds of the target coal mining area; determines the overburden coordination deformation model based on the number of mining rounds of the target coal mining area; obtains the overburden layer distribution load intensity, uniaxial compressive strength of the coal body and elastic modulus of the coal body of the target coal mining area; determines the target elastic modulus of the filling body and the total overburden subsidence based on the strip coal pillar width, strip coal pillar height, overburden layer distribution load intensity, uniaxial compressive strength of the coal body and the preset overburden subsidence value through the overburden coordination deformation model; and determines the target uniaxial compressive strength of the filling body based on the uniaxial compressive strength of the coal body and the target elastic modulus of the filling body. By using the overburden deformation coordination model, the number of mining rounds, strip coal pillar width, and backfill stiffness of the target coal mining area that can meet the maximum overburden subsidence value are determined. Based on the elastic modulus of the coal body and the target elastic modulus of the backfill, the target uniaxial compressive strength of the backfill is determined, thereby improving the rationality and accuracy of key parameters in coal mining. This effectively controls the total overburden subsidence and avoids problems such as building deformation, cracking, and lower-than-expected mine production capacity or economic benefits caused by excessive overburden subsidence.

[0148] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 8 As shown, the electronic device may include: a transceiver 81, a processor 82, and a memory 83.

[0149] Processor 82 executes computer execution instructions stored in memory, causing processor 82 to perform the scheme in the above embodiments. Processor 82 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0150] The memory 83 is connected to the processor 82 via the system bus and communicates with it. The memory 83 is used to store computer program instructions.

[0151] Transceiver 81 can be used to obtain the task to be run and its configuration information.

[0152] The system bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The system bus can be divided into address bus, data bus, control bus, etc. For ease of representation, only one thick line is used in the diagram, but this does not indicate that there is only one bus or one type of bus. Transceivers are used to enable communication between database access devices and other computers (e.g., clients, read-write libraries, and read-only libraries). Memory may include random access memory (RAM) and may also include non-volatile memory.

[0153] The electronic device provided in this application embodiment can be the terminal device described in the above embodiments.

[0154] This application also provides a chip for executing instructions, which is used to execute the message processing method described in the above embodiments.

[0155] This application also provides a computer-readable storage medium storing computer instructions that, when executed on a computer, cause the computer to perform the message processing method described in the above embodiments.

[0156] This application also provides a computer program product, which includes a computer program stored in a computer-readable storage medium. At least one processor can read the computer program from the computer-readable storage medium, and when the at least one processor executes the computer program, it can implement the technical solution of the message processing method in the above embodiments.

[0157] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0158] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for coordinated control of overburden deformation in continuous mining and filling working faces, characterized in that, The method includes: The height of the strip coal pillar and the preset overburden subsidence value of the target coal mining area were obtained respectively; The width of the strip coal pillar and the number of backfilling mining rounds for the target coal mining area are determined respectively; The overburden coordination deformation model is determined based on the number of mining rounds in the target coal mining area; The load intensity of the overburden strata, the uniaxial compressive strength of the coal body, and the elastic modulus of the coal body in the target coal mining area were obtained respectively. Based on the width and height of the strip coal pillar, the load intensity of the overburden layer, the uniaxial compressive strength of the coal body, and the preset overburden subsidence value, the target elastic modulus of the filling body and the total overburden subsidence are determined through the overburden coordinated deformation model. The target uniaxial compressive strength of the filling material is determined based on the uniaxial compressive strength of the coal body and the target elastic modulus of the filling material. The method for determining the overburden coordination deformation model based on the number of mining rounds in the target coal mining area includes: Obtain the load intensity of the overburden distribution; Based on the width of the strip coal pillar, the intensity of the overburden distribution load, and the number of mining rounds in the target coal mining area, the calculation formula for the overburden subsidence in each round of mining in the target coal mining area is determined respectively. Based on the calculation formula for the subsidence of the overburden in each round of mining in the target coal mining area, the calculation formula for the total subsidence of the overburden is determined, and the calculation formula for the total subsidence of the overburden is determined as the overburden coordinated deformation model. Specifically, the overlying rock coordinated deformation model is as follows: The area of ​​coal seam to be mined is divided into: A strip of coal pillar, The length of the filling area, The load intensity of the overburden above the filling area is given. This represents the stiffness coefficient of a single strip coal pillar. denoted as the stiffness coefficient of a single backfill strip, m as the number of backfill mining rounds in the target coal mining area, x1 as the overburden subsidence in the first round of mining, x2 as the overburden subsidence in the second round of mining, x3 as the overburden subsidence in the third round of mining, and x... m-1 x represents the subsidence of the overlying strata during the (m-1)th mining round. m Let m be the amount of overburden subsidence during the m-th mining round; The step of determining the target uniaxial compressive strength of the filling material based on the uniaxial compressive strength of the coal body and the target elastic modulus of the filling material includes: Obtain the uniaxial compressive strength of the coal seam; The target uniaxial compressive strength of the filling body is calculated based on the uniaxial compressive strength of the coal body, the elastic modulus of the coal body, the target elastic modulus of the filling body, the width of the strip coal pillar, and the height of the strip coal pillar.

2. The method according to claim 1, characterized in that, The process of determining the target elastic modulus of the filling body and the actual total overburden subsidence based on the width and height of the strip coal pillar, the load intensity of the overburden layer, the uniaxial compressive strength of the coal body, and the preset overburden subsidence value, through the overburden coordinated deformation model, includes: Obtain the preset elastic modulus of the filling material; The preset elastic modulus of the filling body, the width of the strip coal pillar, the height of the strip coal pillar, the load intensity of the overburden layer, and the uniaxial compressive strength of the coal body are input into the overburden coordinated deformation model. Obtain the total overburden subsidence output by the overburden coordinated deformation model; The total subsidence of the overlying strata is compared with the preset subsidence value of the overlying strata to obtain the comparison result; In response to the comparison result that the total overburden subsidence is less than or equal to the preset overburden subsidence value, the total overburden subsidence is determined as the actual total overburden subsidence, the width of the strip coal pillar is determined as the target strip coal pillar width, and the preset elastic modulus of the filling body is determined as the target elastic modulus of the filling body. In response to the comparison result that the actual total overburden subsidence is greater than the preset overburden subsidence value, the step of determining the width of the strip coal pillar and the number of mining rounds of the target coal mining area is re-executed.

3. The method according to claim 1, characterized in that, The method of determining the elastic modulus of the filling body and the actual total overburden subsidence based on the strip coal pillar width, strip coal pillar height, overburden load intensity, uniaxial compressive strength of the coal body, and preset overburden subsidence value through the overburden coordinated deformation model further includes: The preset overburden subsidence value is determined as the maximum total overburden subsidence value; The width of the strip coal pillar, the height of the strip coal pillar, the load intensity of the overburden layer, the uniaxial compressive strength of the coal body, and the maximum value of the total overburden subsidence are input into the overburden coordinated deformation model; Obtain the target elastic modulus threshold of the filling body output by the overburden coordinated deformation model; The target elastic modulus of the filling material is determined based on the target elastic modulus threshold of the filling material.

4. The method according to claim 1, characterized in that, The specific formula for calculating the target uniaxial compressive strength of the filling material is as follows: in, The uniaxial compressive strength of the filling material; The uniaxial compressive strength of the coal body; For the height of the filling strip; For the width of a single filling strip, The elastic modulus of coal, The target elastic modulus of the filling material.

5. A device for controlling the coordinated deformation of overburden in a continuous mining and filling working face, characterized in that, The apparatus comprising the method according to any one of claims 1-4, wherein the apparatus includes: The first acquisition module is used to acquire the height of the strip coal pillar and the preset overburden subsidence value of the target coal mining area respectively; The first determining module is used to determine the width of the strip coal pillar and the number of mining rounds in the target coal mining area, respectively. The second determining module is used to determine the overburden coordinated deformation model based on the number of mining rounds in the target coal mining area; The second acquisition module is used to acquire the overburden load intensity, uniaxial compressive strength of coal, and elastic modulus of coal in the target coal mining area, respectively. The third determining module is used to determine the target elastic modulus of the filling body and the total amount of overburden settlement based on the width of the strip coal pillar, the height of the strip coal pillar, the load intensity of the overburden layer, the uniaxial compressive strength of the coal body, and the preset overburden settlement value, through the overburden coordinated deformation model. The fourth determining module is used to determine the target uniaxial compressive strength of the filling body based on the uniaxial compressive strength of the coal body and the target elastic modulus of the filling body.

6. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method as described in any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-4.

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