Coal seam mining collapse zone height calculation system and method based on equivalent layer model

Abstract

The present invention discloses a coal seam mining collapse zone height calculation system and method based on an equivalent layer model in the field of coal mining technology, comprising: obtaining comprehensive geological data of the target mine, obtaining the equivalent layer mining momentum of the upper coal seam when the lower coal seam is mined through numerical simulation, similar material simulation test, and on-site measurement; adding the equivalent layer mining momentum of the upper coal seam to the upper coal seam mining height to obtain the equivalent cumulative mining thickness; substituting the equivalent cumulative mining thickness into the traditional thick coal seam layer mining prediction formula to calculate the collapse zone height of the upper coal seam after re-mining; adding the collapse zone height of the upper coal seam after re-mining to the thickness of the rock layer between the coal seams to obtain the predicted value of the collapse zone height of the composite goaf. The present invention innovates the overburden migration zoning analysis theory of coal seam group mining, uses multiple methods to obtain the equivalent layer mining height during coal seam group mining, and provides a theoretical basis for the prediction of overburden migration zoning height in coal seam group mining.

Description

Technical Field

[0001] The invention relates to a coal seam mining collapse zone height calculation system and method based on an equivalent layering model, and belongs to the technical field of coal mining. Background Art

[0002] With the continuous deepening of coal seam mining, the upper coal seams of many mines have been mined and mining of the lower coal seams has begun. The thickness of the lower coal seam and the structure of the interlayer rock strata cause different degrees of re-disturbance to the upper goaf, resulting in variable types and heights of collapse zones and the formation of a large number of mining-induced fissures. During the mining process of the lower coal seam, mining-induced fissures intertwine to form a fracture network and evolve, triggering a series of disasters such as water inrush and mud inrush. In the absence of a theoretical basis for estimating the height of the overburden migration zone in coal seam groups, the estimated values ​​of collapse zones and fracture zones differ significantly from the measured values ​​in mines. The actual development height of the collapse zone varies with the changes in the overburden structure of the coal seam group in the stratum. Therefore, to analyze the damage of the overburden, it is necessary to adopt an accurate and effective method to accurately predict the height of the overburden migration zone in coal seam group mining, of which the development height of the collapse zone is the key to prediction.

[0003] At present, the commonly used methods for predicting collapse zones include the "three-down" empirical formula method, simulation method, analogy method, etc., and the existing prediction methods are generally targeted at specific production geological conditions. Considering the variability of geological conditions and the differences in overburden structure, it is urgently necessary to establish a method for predicting the height of collapse zones in coal seam group mining based on traditional prediction theory. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a coal seam mining collapse zone height calculation system and method based on an equivalent layering model, which can effectively predict the development height of overburden migration zones under coal seam group mining conditions and can adapt to the occurrence characteristics of various coal seam groups.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] In a first aspect, the present invention provides a method for calculating the height of a coal seam collapse zone based on an equivalent layering model, comprising:

[0007] Obtain comprehensive geological data of the target mine, and obtain the equivalent layered mining momentum of the upper coal seam when mining the lower coal seam through numerical simulation, similar material simulation tests, and on-site measurements;

[0008] The equivalent layered mining momentum of the upper coal seam is added to the upper coal seam mining height to obtain the equivalent cumulative mining thickness;

[0009] Substitute the equivalent cumulative mining thickness into the traditional thick coal seam layer mining prediction formula to calculate the height of the upper coal seam collapse zone after mining again;

[0010] The height of the collapse zone of the upper coal seam after mining again is added to the thickness of the rock layer between the coal seams to obtain the estimated value of the collapse zone height of the composite goaf.

[0011] Furthermore, the equivalent layered mining momentum of the upper coal seam during mining of the lower coal seam is obtained through numerical simulation, similar material simulation tests, and field measurements, including:

[0012] Based on the geological parameters of the target mine, a numerical model is established in combination with numerical simulation software. By arranging monitoring points on the model, the displacement caused by the sinking of the upper coal seam floor caused by the mining of the lower coal seam is obtained. ;

[0013] Based on the geological parameters of the target mine, the scale ratio of the indoor similar material simulation test is determined according to similarity theory. The material is used to simulate the rock layer, laid in layers and compacted. By drawing speckles on the surface of the model, the displacement caused by the sinking of the upper coal seam floor caused by the mining of the lower coal seam is monitored using non-contact technology. ;

[0014] During the mining process of the lower coal seam working face, displacement sensors are arranged on the roof of the upper coal seam working face to monitor the displacement of the upper coal seam roof. The sensor data is uploaded to the mine dispatching room data center through the industrial ring network after passing through the communication substation and the communication main station, thereby obtaining the displacement caused by the sinking of the upper coal seam floor when the lower coal seam is mined. ;

[0015] Based on the displacement caused by the sinking of the upper coal seam floor when the lower coal seam is mined 、 、 Determine the equivalent layered mining momentum.

[0016] Furthermore, the numerical simulation software includes FLAC3D, UDEC and 3DEC , the non-contact technology includes digital speckle technology.

[0017] Furthermore, the equivalent cumulative thickness calculation formula is:

[0018] Where: It is the equivalent cumulative mining thickness; is the equivalent layered mining momentum; To mine the upper coal seam.

[0019] Furthermore, the calculation formula for the height of the upper coal seam collapse zone after the second mining is:

[0020] Where: It is the height of the collapse zone of the upper coal seam after mining; It is the equivalent cumulative mining thickness; is the equivalent layered mining momentum; To mine the upper coal seam; 、 、 is the roof characteristic coefficient; R It is the comprehensive lithology of the overlying rock strata; It is a hard rock layer; It is a medium-hard rock layer; They are weak rock layers and extremely soft rock layers.

[0021] Furthermore, the roof characteristic coefficient is taken as follows according to the roof conditions:

[0022] When the roof condition is hard, is 2.1, is 16, is 2.5;

[0023] When the roof condition is medium hard, is 4.7, is 19, is 2.2;

[0024] When the roof condition is weak, is 6.2, is 32, is 1.5;

[0025] When the roof condition is extremely weak, is 7.0, is 63, is 1.2.

[0026] Furthermore, the formula for estimating the height of the collapse zone in the composite goaf is as follows:

[0027] Where: is the estimated height of the collapse zone in the composite goaf; It is the height of the collapse zone of the upper coal seam after mining; is the thickness of the rock layer between coal seams.

[0028] In a second aspect, the present invention provides a coal seam mining collapse zone height calculation system based on an equivalent layer model, comprising:

[0029] Equivalent layer mining momentum calculation module: Obtain comprehensive geological data of the target mine, and obtain the equivalent layer mining momentum of the upper coal seam when the lower coal seam is mined through numerical simulation, similar material simulation tests, and on-site measurements;

[0030] Equivalent cumulative mining thickness calculation module: the equivalent layered mining momentum of the upper coal seam is added to the upper coal seam mining height to obtain the equivalent cumulative mining thickness;

[0031] Module for calculating the height of the upper coal seam collapse zone after re-mining: Substitute the equivalent cumulative mining thickness into the traditional thick coal seam layered mining prediction formula to calculate the height of the upper coal seam collapse zone after re-mining;

[0032] Composite goaf collapse zone height prediction module: the height of the upper coal seam collapse zone after mining again is added to the thickness of the rock layer between the coal seams to obtain the estimated value of the composite goaf collapse zone height.

[0033] In a third aspect, the present invention provides a device for calculating the height of a coal seam mining collapse zone based on an equivalent layer model, comprising a processor and a storage medium;

[0034] The storage medium is used to store instructions;

[0035] The processor is configured to operate according to the instructions to execute the steps of any of the above methods.

[0036] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any of the above methods when executed by a processor.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The present invention provides a method for calculating the height of the collapse zone in coal seam group mining based on the equivalent layered mining height model. The calculation method is based on the traditional thick coal seam layered estimated mining formula. According to the equivalent layered mining height model, the height of the collapse zone after coal seam mining is calculated by the roof lithology, providing a new calculation method for calculating the height of the water-conducting fracture zone in the safe mining of coal seam groups in mining areas.

[0039] Second, this invention uses numerical simulations, similar material simulations, and field measurements to determine the equivalent layered mining volume of the upper coal seam floor after mining the lower coal seam. Substituting this into the traditional formula for predicting layered mining in thick coal seams, the resulting collapse zone height in the upper coal seam is calculated. This method, which can predict the collapse zone height of a coal seam cluster after mining, is more comprehensive than traditional calculation methods and can provide theoretical support for the safe and efficient mining of coal seams in mining areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0041] Figure 1 A flow chart of a method for calculating the height of a coal seam collapse zone based on an equivalent layer model provided in Example 1 of the present invention;

[0042] Figure 2 A model diagram of the predicted development height of the collapse zone in the composite goaf of the method for calculating the height of the coal seam collapse zone based on the equivalent layered model provided in the first embodiment of the present invention. DETAILED DESCRIPTION

[0043] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0044] The following detailed description is an exemplary description and is intended to provide further detailed description of the present invention. Unless otherwise indicated, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0045] Example 1:

[0046] See also Figure 1 This embodiment discloses a method for calculating the height of the coal seam mining collapse zone based on an equivalent layer model, and the specific steps are as follows:

[0047] S 1. Obtain comprehensive geological data of the target mine and, through numerical simulation, similar material simulation tests, and on-site measurements, determine the displacement caused by the subsidence of the upper coal seam floor when the lower coal seam is mined, i.e., the equivalent layered mining momentum.

[0048] The equivalent layered mining heights obtained through numerical simulation tests, similar material simulation tests and field measurements include:

[0049] Based on the geological parameters of the target mine, combined with numerical simulation software ( FLAC3D, UDEC or 3DEC By arranging monitoring points on the model, the displacement caused by the sinking of the upper coal seam floor caused by the mining of the lower coal seam is obtained. ;

[0050] Based on the geological parameters of the target mine, the scale ratio of the indoor simulation test of similar materials is determined according to similarity theory. Sand, gypsum, mica powder and other materials are used to simulate the rock layer, which is laid and compacted in layers. By drawing speckles on the surface of the model, non-contact technologies such as digital speckle are used to monitor the displacement caused by the sinking of the upper coal seam floor during the mining of the lower coal seam. ;

[0051] During the mining process of the lower coal seam working face, displacement sensors are arranged on the roof of the upper coal seam working face to monitor the displacement of the upper coal seam roof. The sensor data is uploaded to the mine dispatching room data center through the industrial ring network after passing through the communication substation and the communication main station, thereby obtaining the displacement caused by the sinking of the upper coal seam floor when the lower coal seam is mined. ;

[0052] Based on the displacement caused by the sinking of the upper coal seam floor when the lower coal seam is mined 、 、 Determine the equivalent layered mining momentum.

[0053] S 2. Add the equivalent layered mining momentum of the upper coal seam and the mining height of the upper coal seam to obtain the equivalent cumulative mining thickness. The calculation formula for the equivalent cumulative mining thickness is as follows:

[0054] Where: Equivalent cumulative mining thickness, unit: m ; is the equivalent layered mining momentum; The upper coal seam mining height, unit: m .

[0055] S 3. Substitute the equivalent cumulative mining thickness into the traditional thick coal seam layered mining prediction formula to calculate the height of the upper coal seam collapse zone after mining again. The traditional thick coal seam layered mining prediction formula is as follows:

[0056] (1) When the upper coal seam is mined during the mining process of the coal seam group or equivalent layered mining capacity 1~3 m (The cumulative thickness is generally not more than 15 m ), the collapse zone prediction formula is as follows:

[0057]

[0058] (2) When the upper coal seam is mined during the mining process of the coal seam group or equivalent layered mining capacity More than 3 m , the collapse zone prediction formula is as follows:

[0059] ① When the comprehensive lithology of the overlying rock layer is determined to be a hard rock layer, the calculation formula for the collapse zone is:

[0060]

[0061] ② When the comprehensive lithology of the overlying rock layer is determined to be a medium-hard rock layer, the calculation formula for the collapse zone is:

[0062]

[0063] ③ When the comprehensive lithology of the overlying rock layer is determined to be weak or extremely weak rock layer, the calculation formula for the collapse zone is:

[0064]

[0065] Where: is the height of collapse zone, unit: m ; Equivalent cumulative mining thickness, unit: m ; 、 、 is the roof characteristic coefficient, as shown in Table 1.

[0066]

[0067] Table 1 Coal seam roof characteristic coefficients

[0068] In summary, the height of the upper coal seam collapse zone after mining again The calculation formula is as follows:

[0069] Where: Height of the upper coal seam collapse zone after mining, unit: m ; Equivalent cumulative mining thickness, unit: m ; 、 、 is the roof characteristic coefficient; R It is the comprehensive lithology of the overlying rock strata; It is a hard rock layer; It is a medium-hard rock layer; They are weak rock layers and extremely soft rock layers.

[0070] S 4. The height of the upper coal seam collapse zone after mining again Add the thickness of the rock layer between coal seams to obtain the estimated height of the collapse zone in the composite goaf The formula for estimating the height of the collapse zone in the composite goaf is as follows:

[0071] Where: is the estimated height of the collapse zone in the composite goaf, unit: m ; Height of the upper coal seam collapse zone after mining, unit: m ; is the thickness of the rock layer between coal seams, unit: m .

[0072] See also Figure 2 , in the figure is the height of the collapse zone in the composite goaf, is the theoretical collapse zone height of the upper coal seam, is the thickness of the inter-coal layer, is the theoretical collapse zone height of the lower coal seam, To mine the upper coal seam, To mine the lower coal seam, The equivalent layered mining height of the lower coal seam is given below. The following is an example of calculating the height of the collapsed zone in the composite goaf of a coal mine:

[0073] Step 1: Obtain comprehensive geological data of the target mine, and obtain the displacement caused by the subsidence of the upper coal seam floor when the lower coal seam is mined through numerical simulation, similar material simulation test, and field measurement, that is, the equivalent layer mining momentum. m The lower coal seam is buried at a depth of 117.0 m , the upper coal seam mining height is 4.6 m , the lower coal seam mining height is 4.6 m The thickness of the coal seams is 14.9 m The subsidence coefficient of the lower coal seam mining is 0.69. The roof of the lower coal seam is sandstone. According to the on-site measurement, the equivalent mining height of the upper goaf formed after the lower coal seam mining is 4.3 m .

[0074] Step 2: Add the equivalent layered mining momentum of the upper coal seam to the upper coal seam mining height to obtain the equivalent cumulative mining thickness. The equivalent layered mining momentum calculated in step 1 is 4.3 m , and the upper coal seam mining height (4.6 m ) are added together to obtain an equivalent cumulative mining thickness of 8.9 m .

[0075] Step 3: Substitute the equivalent cumulative mining thickness into the traditional thick coal seam layer mining prediction formula to calculate the height of the upper coal seam collapse zone after mining again. The equivalent cumulative mining thickness calculated in step 2 is 8.9 m The roof of the upper coal seam is mudstone. As shown in Table 1, the roof condition is weak. Substituting it into the traditional thick coal seam layer mining prediction formula, the height of the upper coal seam collapse zone after re-mining can be obtained. 49.5 m The field measurement of the drilling fluid consumption of the surface hydrological drilling hole shows the collapse zone height of about 45 m , and the expected result of 49.5 m Basically the same.

[0076] Step 4: After mining again, the height of the upper coal seam collapse zone is added to the thickness of the rock layer between the coal seams to obtain the estimated value of the composite goaf collapse zone height. The height of the upper coal seam collapse zone after mining again is calculated from step 3 to be 49.5m , plus the coal seam spacing of 14.9 m The estimated height of the collapse zone in the composite goaf is 64.4 m According to the calculation results, it is found that they are basically consistent with the measured results.

[0077] In summary, the method of the present invention considers the amount of subsidence of the upper coal seam floor after mining the lower coal seam as the equivalent layered mining momentum. During the mining process of a coal seam cluster, the equivalent layered mining momentum is obtained by means of numerical simulation, similar material simulation tests, and field measurements. Based on the traditional formula for estimating the height of overburden migration zoning in thick coal seam layered mining, a new method for estimating the height of overburden migration zoning in coal seam cluster mining is proposed. This method innovates the theory of overburden migration zoning analysis in coal seam cluster mining, utilizes multiple methods to obtain the equivalent layered mining height during coal seam cluster mining, and provides a theoretical basis for estimating the height of overburden migration zoning in coal seam cluster mining.

[0078] Example 2:

[0079] The coal seam mining collapse zone height calculation system based on the equivalent layer model can implement the coal seam mining collapse zone height calculation method based on the equivalent layer model described in the first embodiment, including:

[0080] Equivalent layer mining momentum calculation module: Obtain comprehensive geological data of the target mine, and obtain the equivalent layer mining momentum of the upper coal seam when the lower coal seam is mined through numerical simulation, similar material simulation tests, and on-site measurements;

[0081] Equivalent cumulative mining thickness calculation module: the equivalent layered mining momentum of the upper coal seam is added to the upper coal seam mining height to obtain the equivalent cumulative mining thickness;

[0082] Module for calculating the height of the upper coal seam collapse zone after re-mining: Substitute the equivalent cumulative mining thickness into the traditional thick coal seam layered mining prediction formula to calculate the height of the upper coal seam collapse zone after re-mining;

[0083] Composite goaf collapse zone height prediction module: the height of the upper coal seam collapse zone after mining again is added to the thickness of the rock layer between the coal seams to obtain the estimated value of the composite goaf collapse zone height.

[0084] Example 3:

[0085] The embodiment of the present invention further provides a device for calculating the height of a coal seam mining collapse zone based on an equivalent layering model, which can implement the method for calculating the height of a coal seam mining collapse zone based on an equivalent layering model described in the first embodiment, including a processor and a storage medium;

[0086] The storage medium is used to store instructions;

[0087] The processor is configured to operate according to the instructions to execute the steps of the following method:

[0088] Obtain comprehensive geological data of the target mine, and obtain the equivalent layered mining momentum of the upper coal seam when mining the lower coal seam through numerical simulation, similar material simulation tests, and on-site measurements;

[0089] The equivalent layered mining momentum of the upper coal seam is added to the upper coal seam mining height to obtain the equivalent cumulative mining thickness;

[0090] Substitute the equivalent cumulative mining thickness into the traditional thick coal seam layer mining prediction formula to calculate the height of the upper coal seam collapse zone after mining again;

[0091] The height of the collapse zone of the upper coal seam after mining again is added to the thickness of the rock layer between the coal seams to obtain the estimated value of the collapse zone height of the composite goaf.

[0092] Example 4:

[0093] An embodiment of the present invention further provides a computer-readable storage medium that can implement the method for calculating the height of a coal seam mining collapse zone based on an equivalent layer model described in Example 1. The computer-readable storage medium stores a computer program that, when executed by a processor, implements the following steps:

[0094] Obtain comprehensive geological data of the target mine, and obtain the equivalent layered mining momentum of the upper coal seam when mining the lower coal seam through numerical simulation, similar material simulation tests, and on-site measurements;

[0095] The equivalent layered mining momentum of the upper coal seam is added to the upper coal seam mining height to obtain the equivalent cumulative mining thickness;

[0096] Substitute the equivalent cumulative mining thickness into the traditional thick coal seam layer mining prediction formula to calculate the height of the upper coal seam collapse zone after mining again;

[0097] The height of the collapse zone of the upper coal seam after mining again is added to the thickness of the rock layer between the coal seams to obtain the estimated value of the collapse zone height of the composite goaf.

[0098] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

[0099] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of one or more computer-usable storage media (including but not limited to disk storage, CD - ROM, optical storage, etc.).

[0100] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0101] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for calculating the height of the coal seam collapse zone based on an equivalent layering model is characterized by: include: Obtain comprehensive geological data of the target mine, and obtain the equivalent layered mining momentum of the upper coal seam when mining the lower coal seam through numerical simulation, similar material simulation tests, and on-site measurements; The equivalent layered mining momentum of the upper coal seam is added to the mining height of the upper coal seam to obtain the equivalent cumulative mining thickness; Substitute the equivalent cumulative mining thickness into the traditional thick coal seam layer mining prediction formula to calculate the height of the upper coal seam collapse zone after re-mining. The calculation formula for the height of the upper coal seam collapse zone after re-mining is: Where: It is the height of the collapse zone of the upper coal seam after mining; It is the equivalent cumulative mining thickness; is the equivalent layered mining momentum; To mine the upper coal seam; is the roof characteristic coefficient; It is the comprehensive lithology of the overlying rock strata; It is a hard rock layer; It is a medium-hard rock layer; It is a weak rock layer and an extremely weak rock layer; The roof characteristic coefficient is taken as follows according to the roof conditions: When the roof condition is hard, is 2.1, is 16, is 2.5; When the roof condition is medium hard, is 4.7, is 19, is 2.2; When the roof condition is weak, is 6.2, is 32, is 1.5; When the roof condition is extremely weak, is 7.0, is 63, is 1.2; The height of the collapse zone of the upper coal seam after mining again is added to the thickness of the rock layer between the coal seams to obtain the estimated value of the collapse zone height of the composite goaf.

2. The method for calculating the height of the coal seam mining collapse zone based on the equivalent layer model according to claim 1 is characterized in that: The equivalent layered mining momentum of the upper coal seam during mining of the lower coal seam is obtained through numerical simulation, similar material simulation tests, and field measurements, including: Based on the geological parameters of the target mine, a numerical model is established in combination with numerical simulation software. By arranging monitoring points on the model, the displacement caused by the sinking of the upper coal seam floor caused by the mining of the lower coal seam is obtained. ; Based on the geological parameters of the target mine, the scale ratio of the indoor similar material simulation test is determined according to similarity theory. The material is used to simulate the rock layer, laid in layers and compacted. By drawing speckles on the surface of the model, the displacement caused by the sinking of the upper coal seam floor caused by the mining of the lower coal seam is monitored using non-contact technology. ; During the mining process of the lower coal seam working face, displacement sensors are arranged on the roof of the upper coal seam working face to monitor the displacement of the upper coal seam roof. The sensor data is uploaded to the mine dispatching room data center through the industrial ring network after passing through the communication substation and the communication main station, thereby obtaining the displacement caused by the sinking of the upper coal seam floor when the lower coal seam is mined. ; Based on the displacement caused by the sinking of the upper coal seam floor when the lower coal seam is mined Determine the equivalent layered mining momentum.

3. The method for calculating the height of the coal seam mining collapse zone based on the equivalent layer model according to claim 2 is characterized in that: The numerical simulation software includes FLAC3D, UDEC and 3DEC , the non-contact technology includes digital speckle technology.

4. The method for calculating the height of the coal seam mining collapse zone based on the equivalent layer model according to claim 1 is characterized in that: The equivalent cumulative thickness calculation formula is: Where: It is the equivalent cumulative mining thickness; is the equivalent layered mining momentum; To mine the upper coal seam.

5. The method for calculating the height of the coal seam mining collapse zone based on the equivalent layer model according to claim 1 is characterized in that: The formula for estimating the height of the collapse zone in the composite goaf is as follows: Where: is the estimated height of the collapse zone in the composite goaf; It is the height of the collapse zone of the upper coal seam after mining; is the thickness of the rock layer between coal seams.

6. A coal seam mining collapse zone height calculation system based on an equivalent layer model is characterized by: include: Equivalent layer mining momentum calculation module: Obtain comprehensive geological data of the target mine, and obtain the equivalent layer mining momentum of the upper coal seam when the lower coal seam is mined through numerical simulation, similar material simulation tests, and on-site measurements; Equivalent cumulative mining thickness calculation module: the equivalent layered mining momentum of the upper coal seam is added to the upper coal seam mining height to obtain the equivalent cumulative mining thickness; Module for calculating the height of the upper coal seam collapse zone after re-mining: Substitute the equivalent cumulative mining thickness into the traditional thick coal seam layered mining prediction formula to calculate the height of the upper coal seam collapse zone after re-mining. The calculation formula for the height of the upper coal seam collapse zone after re-mining is: Where: It is the height of the collapse zone of the upper coal seam after mining; It is the equivalent cumulative mining thickness; is the equivalent layered mining momentum; To mine the upper coal seam; is the roof characteristic coefficient; It is the comprehensive lithology of the overlying rock strata; It is a hard rock layer; It is a medium-hard rock layer; It is a weak rock layer and an extremely weak rock layer; The roof characteristic coefficient is taken as follows according to the roof conditions: When the roof condition is hard, is 2.1, is 16, is 2.5; When the roof condition is medium hard, is 4.7, is 19, is 2.2; When the roof condition is weak, is 6.2, is 32, is 1.5; When the roof condition is extremely weak, is 7.0, is 63, is 1.2; Composite goaf collapse zone height prediction module: the height of the upper coal seam collapse zone after mining again is added to the thickness of the rock layer between the coal seams to obtain the estimated value of the composite goaf collapse zone height.

7. A device for calculating the height of a coal seam collapse zone based on an equivalent layer model, characterized in that: including processor and storage medium; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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