Key layer identification and top cutting pressure relief effect evaluation method, system, device and medium

Abstract

The application relates to the technical field of coal mining, and discloses a key layer identification and top cutting and pressure releasing effect evaluation method, system, equipment and medium, which comprises the following steps: identifying the key layer position of a coal mining working face, and densely arranging magnetic rings in the key layer position; installing a real-time monitoring wireless transmission system in an observation hole, and collecting whole-process data; identifying a target key layer according to the whole-process data, and calculating a first gradual breaking time difference and a first key layer caving step distance; performing a top cutting and pressure releasing operation on the target key layer, collecting whole-process data of the top cutting and pressure releasing, calculating a second gradual breaking time difference and a second key layer caving step distance, and then calculating a top cutting and pressure releasing evaluation index. The application can collect whole-process data in real time, and can evaluate the top cutting and pressure releasing effect according to the key layer caving step distance and the gradual breaking time difference of the roof, so that the precision and timeliness of key layer identification and top cutting and pressure releasing effect evaluation are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, specifically to a method, system, equipment, and medium for identifying key strata and evaluating the effectiveness of roof cutting and pressure relief. Background Technology

[0002] In existing coal mine roof cutting and pressure relief technologies, the key stratum (KS) of the working face refers to the core rock stratum that affects the movement of overlying strata, stress distribution, and mine pressure manifestation. Its mechanical properties and motion patterns directly determine the effectiveness of roof cutting and pressure relief and the safety of the project. Therefore, the accurate identification of the key stratum and the evaluation of the roof cutting and pressure relief effect have always been core challenges restricting the effectiveness of surrounding rock control. Traditional key stratum identification mainly relies on theoretical formulas or numerical simulations, lacking real-time field verification. Existing roof delamination monitoring almost entirely uses wired multi-point displacement gauges or manual handheld acquisition boxes. Data acquisition is intermittent and requires manual intervention, making it impossible to achieve continuous real-time monitoring throughout the entire working face advancement process (especially after drilling into the goaf). This results in delayed key stratum location identification and a heavy reliance on indirect indicators such as mine pressure manifestation for evaluating the roof cutting and pressure relief effect. The evaluation results are subjective, inaccurate, and lack timeliness, leading to blind optimization of roof cutting parameters, large deformation of some engineering roadways, and roof cutting failure. To date, there is no publicly available technology that combines intrinsically safe wireless real-time transmission technology for mining with magnetostrictive multi-point displacement gauges to achieve continuous real-time monitoring of the entire process of critical layer fracture and to propose quantitative evaluation indicators based on this technology.

[0003] Therefore, improving the adaptability and accuracy of key layer identification and top-cutting pressure relief effect evaluation has become an urgent problem to be solved. Summary of the Invention

[0004] The technical problem to be solved by this invention is how to improve the adaptability and accuracy of key layer identification and top pressure relief effect evaluation.

[0005] The present invention solves the above-mentioned technical problems through the following technical means: This invention provides a method for identifying critical layers and evaluating the effect of top-cutting and pressure relief, including: Obtain stratigraphic data of the coal mine working face, identify key strata based on the stratigraphic data, and densely arrange magnetic rings within the key strata. A first observation hole is constructed at a predetermined location on the coal mine working face, and a real-time monitoring wireless transmission system is installed in the first observation hole; The real-time monitoring wireless transmission system and the encrypted magnetic ring are used to collect data on the entire process of the coal mine mining face. Based on the full-process data, the target key layer of the coal mine working face is identified and the time difference of the first progressive breaking section and the step distance of the first key layer are calculated. Perform a top-cutting and pressure-relief operation on the target critical layer, and collect data on the entire top-cutting and pressure-relief process corresponding to the operation. Calculate the second progressive segment time difference and the second critical layer step distance based on the data of the entire process of top cutting and depressurization. The evaluation index for top cutting and pressure relief is calculated based on the first progressive segment breakage time difference, the first key layer step distance, the second progressive segment breakage time difference, and the second key layer step distance.

[0006] To address the aforementioned problems, this invention also proposes a critical layer identification and top-cutting pressure relief effect evaluation system, the system comprising: The key layer identification module is used to acquire stratigraphic data of the coal mine working face, identify key layers based on the stratigraphic data, and densify the arrangement of magnetic rings within the key layers. A real-time monitoring module is used to construct a first observation hole at a preset location on the coal mine working face and install a real-time monitoring wireless transmission system in the first observation hole. The data acquisition module is used to collect data on the entire process of the coal mine mining face using the real-time monitoring wireless transmission system and the encrypted magnetic ring. The first calculation module identifies the target key layer of the coal mine working face based on the full-process data and calculates the first progressive breaking time difference and the first key layer step distance. The top-cutting and pressure-relieving module is used to perform top-cutting and pressure-relieving operations on the target critical layer and collect the full-process data of the top-cutting and pressure-relieving operation. The second calculation module is used to calculate the second progressive breakage time difference and the second key layer step distance based on the data of the entire process of top cutting and depressurization. The top-cutting and pressure-relief evaluation index module is used to calculate the top-cutting and pressure-relief evaluation index based on the first progressive segment failure time difference, the first key layer crossing step distance, the second progressive segment failure time difference, and the second key layer crossing step distance.

[0007] The present invention also provides a processing device, characterized in that it includes at least one processor and at least one memory communicatively connected to the processor, wherein: the memory stores program instructions executable by the processor, and the processor can execute the above-mentioned method for key layer identification and top pressure relief effect evaluation by calling the program instructions.

[0008] The present invention also provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions, the computer instructions causing the computer to execute the above-mentioned method for key layer identification and top pressure relief effect evaluation.

[0009] The advantages of this invention are: This invention uses a real-time monitoring wireless transmission system to collect data on the critical layer's step distance and the time difference of the roof's progressive breaking segment in a coal mine working face. This enables continuous real-time monitoring of the entire working face advancement process (especially after drilling into the goaf). Simultaneously, it evaluates the roof cutting and pressure relief effect based on the critical layer's step distance and the time difference of the roof's progressive breaking segment, effectively improving the accuracy and timeliness of critical layer identification and roof cutting and pressure relief. Attached Figure Description

[0010] Figure 1 This is a flowchart illustrating a method for identifying key layers and evaluating the effect of top-cutting and pressure relief in one embodiment of the present invention; Figure 2 This is a functional module diagram of a critical layer identification and top-cutting pressure relief effect evaluation system provided in one embodiment of the present invention. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0012] Reference Figure 1 The diagram shown is a flowchart illustrating a method for identifying critical layers and evaluating the effect of top-cutting and pressure relief according to an embodiment of the present invention. In this embodiment, the method for identifying critical layers and evaluating the effect of top-cutting and pressure relief includes: S1. Obtain stratigraphic data of the coal mine working face, identify key strata based on the stratigraphic data, and densely arrange magnetic rings within the key strata.

[0013] In this embodiment of the invention, the stratigraphic data of the coal mine working face can be geological profiles, layer data, rock mechanical parameter data, etc. Based on the stratigraphic data, the key layer theory calculation formula is used in combination with professional numerical simulation software such as FLAC3D or 3DEC to perform numerical simulation to preliminarily predict the key layer position and obtain the key layer position.

[0014] Furthermore, magnetic rings are densely arranged within the key layers predicted in the coal mine working face.

[0015] S2. Construct a first observation hole at a predetermined position on the coal mine working face, and install a real-time monitoring wireless transmission system in the first observation hole.

[0016] In this embodiment of the invention, an observation hole is constructed outside the influence range of the advanced stress of the coal mine working face as the first observation hole. A real-time monitoring wireless transmission system for intrinsically safe magnetostrictive multi-point displacement in mining is installed in the first observation hole (using one or more combinations of wireless communication methods, such as intrinsically safe WiFi, LoRa, ZigBee, UWB or proprietary protocol 915MHz / 2.4GHz).

[0017] S3. Collect the entire process data of the coal mine mining face using the real-time monitoring wireless transmission system and the encrypted magnetic ring.

[0018] In this embodiment of the invention, continuous monitoring is carried out throughout the entire process of coal mine face advancement: the entire process is as follows: observation hole advances ahead of the working face → the working face is pushed to the observation hole → the observation hole is located in the goaf behind.

[0019] In detail, the entire process data of the recommended work surface is collected by using a real-time monitoring wireless transmission system and a densely arranged magnetic ring.

[0020] S4. Identify the target key layer of the coal mine working face based on the full process data and calculate the time difference of the first progressive breaking section and the step distance of the first key layer.

[0021] In this embodiment of the invention, the key layer is identified by monitoring the linkage relationship of the top plate throughout the entire process based on the data, and the first progressive fracture time difference ▽t1 of the top plate is obtained. The first key layer step distance L1 is determined based on the relative position of the working face with the first observation hole during the advancement process.

[0022] S5. Perform a top-cutting and pressure-relief operation on the target critical layer and collect the full-process data of the top-cutting and pressure-relief operation.

[0023] In this embodiment of the invention, boreholes are drilled to cut the top and relieve pressure in the target critical layer. The pressure relief hole is selected as the second observation hole. A mine-use intrinsically safe magnetostrictive multi-point displacement real-time monitoring wireless transmission system is arranged in the second observation hole. Magnetic rings are densely arranged in the target critical layer to monitor the movement of the critical layer in real time throughout the entire process of working face advancement.

[0024] S6. Calculate the second progressive breakage time difference and the second critical layer step distance based on the data of the entire process of top cutting and depressurization.

[0025] In this embodiment of the invention, the linkage relationship of the roof plate throughout the entire process is analyzed based on the data of the entire process of roof cutting and depressurization, and the time difference ▽t2 of the second progressive breaking section of the roof plate is obtained. The step distance L2 of the second key layer is determined based on the relative position of the working face with the second observation hole during the advancement process.

[0026] S7. Calculate the top-cutting and pressure-relief evaluation index based on the first progressive segment time difference, the first key layer step distance, the second progressive segment time difference, and the second key layer step distance.

[0027] In this embodiment of the invention, the top cutting and pressure relief effect is comprehensively judged based on indicators such as (▽t1, L1) and (▽t2, L2): Top cutting time difference: ▽t1-▽t2; Top cutting time factor: ▽t2 / ▽t1; Top cutting step difference: L1-L2; Top cutting step factor: L2 / L1.

[0028] Furthermore, the pressure relief of the top is comprehensively evaluated based on the top-cutting time difference, top-cutting time factor, top-cutting step difference, and top-cutting step factor, among other top-cutting pressure relief evaluation indicators.

[0029] like Figure 2 The diagram shown is a functional block diagram of a key layer identification and top-cutting pressure relief effect evaluation system provided in an embodiment of the present invention.

[0030] The critical layer identification and top-cutting pressure relief effect evaluation system 100 of this invention can be installed in a processing device. Depending on the functions implemented, the critical layer identification and top-cutting pressure relief effect evaluation system 100 may include a critical layer identification module 101, a real-time monitoring module 102, a data acquisition module 103, a first calculation module 104, a top-cutting pressure relief module 105, a second calculation module 106, and a top-cutting pressure relief evaluation index module 107. The module described in this invention can also be called a unit, which refers to a series of computer program segments that can be executed by the processor of an electronic device and can perform a fixed function, stored in the memory of the electronic device.

[0031] In this embodiment, the functions of each module / unit are as follows: The key layer identification module 101 is used to acquire stratigraphic data of the coal mine working face, identify key layers based on the stratigraphic data, and densify the arrangement of magnetic rings within the key layers. The real-time monitoring module 102 is used to construct a first observation hole at a preset position on the coal mine working face and install a real-time monitoring wireless transmission system in the first observation hole. The data acquisition module 103 is used to collect data on the entire process of the coal mine mining face using the real-time monitoring wireless transmission system and the encrypted magnetic ring. The first calculation module 104 uses the full-process data to identify the target key layer of the coal mine working face and calculates the first progressive breaking time difference and the first key layer step distance. The top-cutting and pressure-relieving module 105 is used to perform top-cutting and pressure-relieving operations on the target critical layer and collect the full-process data of the top-cutting and pressure-relieving operations. The second calculation module 106 is used to calculate the second progressive breakage time difference and the second key layer step distance based on the data of the entire process of top cutting and depressurization. The top-cutting and pressure-relief evaluation index module 107 is used to calculate the top-cutting and pressure-relief evaluation index based on the first progressive segment time difference, the first key layer step distance, the second progressive segment time difference, and the second key layer step distance.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for identifying key layers and evaluating the effect of top-cutting and pressure relief, characterized in that, include: Obtain stratigraphic data of the coal mine working face, identify key strata based on the stratigraphic data, and densely arrange magnetic rings within the key strata. A first observation hole is constructed at a predetermined location on the coal mine working face, and a real-time monitoring wireless transmission system is installed in the first observation hole; The real-time monitoring wireless transmission system and the encrypted magnetic ring are used to collect data on the entire process of the coal mine mining face. Based on the full-process data, the target key layer of the coal mine working face is identified and the time difference of the first progressive breaking section and the step distance of the first key layer are calculated. Perform a top-cutting and pressure-relief operation on the target critical layer, and collect data on the entire top-cutting and pressure-relief process corresponding to the operation. Calculate the second progressive segment time difference and the second critical layer step distance based on the data of the entire process of top cutting and depressurization. The evaluation index for top cutting and pressure relief is calculated based on the first progressive segment breakage time difference, the first key layer step distance, the second progressive segment breakage time difference, and the second key layer step distance.

2. A critical layer identification and top-cutting pressure relief effect evaluation system, characterized in that, include: The key layer identification module is used to acquire stratigraphic data of the coal mine working face, identify key layers based on the stratigraphic data, and densify the arrangement of magnetic rings within the key layers. A real-time monitoring module is used to construct a first observation hole at a preset location on the coal mine working face and install a real-time monitoring wireless transmission system in the first observation hole. The data acquisition module is used to collect data on the entire process of the coal mine mining face using the real-time monitoring wireless transmission system and the encrypted magnetic ring. The first calculation module identifies the target key layer of the coal mine working face based on the full-process data and calculates the first progressive breaking time difference and the first key layer step distance. The top-cutting and pressure-relieving module is used to perform top-cutting and pressure-relieving operations on the target critical layer and collect the full-process data of the top-cutting and pressure-relieving operation. The second calculation module is used to calculate the second progressive breakage time difference and the second key layer step distance based on the data of the entire process of top cutting and depressurization. The top-cutting and pressure-relief evaluation index module is used to calculate the top-cutting and pressure-relief evaluation index based on the first progressive segment failure time difference, the first key layer crossing step distance, the second progressive segment failure time difference, and the second key layer crossing step distance.

3. A processing device, characterized in that, It includes at least one processor and at least one memory communicatively connected to the processor, wherein: the memory stores program instructions executable by the processor, and the processor can execute the method as described in claim 1 by invoking the program instructions.

4. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause the computer to perform the method as described in claim 1.

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