Deep roadway anchoring area stability evaluation method, system, device and medium

Abstract

The present application relates to the technical field of coal mining, and discloses a deep roadway anchoring area stability evaluation method, system, device and medium, the method comprising: identifying the key layer horizon of the deep roadway anchoring area; setting up a real-time monitoring wireless transmission system and an encrypted magnetic ring according to the key layer horizon and collecting first observation data; constructing a second observation hole according to the key layer and collecting second detection data according to the second observation hole; collecting real-time monitoring data of the key layer after cutting the roof and unloading pressure; and calculating the stability index value of the deep roadway anchoring area according to the first observation data, the second observation data and the real-time monitoring data. The present application can monitor the stability characterization parameters of the anchoring area in real time, and then comprehensively evaluate the stability of the deep roadway anchoring area, effectively improving the efficiency and accuracy of the anchoring area stability evaluation.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, specifically to a method, system, equipment, and medium for evaluating the stability of anchorage zones in deep roadways. Background Technology

[0002] Deep coal mine roadways are affected by high ground stress, strong mining, and surrounding rock rheology. Poor stability in the anchorage zone (the effective range of anchor bolt support) has become a core bottleneck restricting the safe and efficient operation of roadways.

[0003] Existing technologies mainly rely on indirect indicators such as surrounding rock strength, anchor bolt (cable) preload, and mine pressure manifestation to evaluate the stability of the anchorage zone. They lack precise identification methods for the key support layer (the main hard rock layer that controls the overall stability of the anchorage zone) under deep conditions and quantitative evaluation methods for the support-rock layer linkage relationship.

[0004] Meanwhile, existing roof delamination monitoring still relies mainly on wired or manual handheld data collection, which cannot achieve real-time wireless continuous monitoring within the goaf. Although there are distributed force-measuring anchor bolts (cables) for anchor bolt (cable) stress monitoring, they are not used in conjunction with the failure characteristics of key layers. This makes it impossible to quantitatively reveal the degree of synchronous improvement in the axial force distribution, rock movement amplitude, and key layer collapse characteristics of the anchoring zone after roof cutting and pressure relief or support reinforcement. As a result, the design of deep roadway support and the optimization of roof cutting parameters are blind, and the repair rate is high.

[0005] Therefore, how to efficiently and accurately evaluate the stability of the anchorage zone in deep roadways has become an urgent problem to be solved. Summary of the Invention

[0006] The technical problem to be solved by this invention is how to improve the efficiency and accuracy of stability evaluation of anchorage zones in deep roadways.

[0007] The present invention solves the above-mentioned technical problems through the following technical means: This invention provides a method for evaluating the stability of anchorage zones in deep roadways, comprising: Obtain stratigraphic data of the deep tunnel anchorage zone, and identify key strata based on the stratigraphic data; A real-time monitoring wireless transmission system and a densely arranged magnetic ring are installed at the working face of the deep roadway anchorage zone according to the key layer location; the first observation data is collected according to the real-time monitoring wireless transmission system; Based on the first observation data, a key layer is identified, and based on the key layer, a second observation hole is constructed in the anchorage zone of the deep roadway. Based on the second observation hole, second detection data is collected. After the key layer is depressurized by cutting the top, the third and fourth observation holes are constructed in the deep roadway anchorage zone. Real-time monitoring data of the key layer are collected using the third and fourth observation holes. The stability index value of the deep roadway anchorage zone is calculated based on the first observation data, the second observation data, and the real-time monitoring data.

[0008] To address the aforementioned problems, this invention also proposes a stability evaluation system for anchorage zones in deep roadways, the system comprising: The key layer location identification module is used to acquire stratigraphic data of the anchorage zone in deep tunnels and identify key layer locations based on the stratigraphic data. The first observation data acquisition module is used to set up a real-time monitoring wireless transmission system and densely arrange magnetic rings at the working face of the deep roadway anchorage zone according to the key layer position; and to acquire first observation data based on the real-time monitoring wireless transmission system and the real-time monitoring wireless transmission system. The second observation data acquisition module is used to identify key layers based on the first observation data, construct second observation holes in the deep roadway anchorage zone based on the key layers, and acquire second detection data based on the second observation holes. The observation hole construction module is used to construct the third and fourth observation holes in the deep roadway anchorage zone after the key layer is cut off and depressurized. The real-time monitoring data acquisition module is used to acquire real-time monitoring data of the key layer based on the third observation hole and the fourth observation hole; The stability index value calculation module is used to calculate the stability index value of the deep roadway anchorage zone based on the first observation data, the second observation data, and the real-time monitoring data.

[0009] 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-described method for evaluating the stability of the anchorage zone in deep roadways by calling the program instructions.

[0010] 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 perform the above-described method for evaluating the stability of deep roadway anchorage zones.

[0011] The advantages of this invention are: This invention combines wireless real-time multi-point displacement monitoring with distributed real-time force-measuring anchor bolts (cables) to achieve real-time monitoring of anchorage stability characterization parameters such as time difference, step distance difference, axial force difference, and motion amplitude difference. This allows for a comprehensive evaluation of the stability of deep roadway anchorage zones based on these stability characterization parameters, effectively improving the efficiency and accuracy of anchorage stability assessment. Attached Figure Description

[0012] Figure 1 This is a schematic flowchart of a method for evaluating the stability of anchorage zones in deep roadways according to an embodiment of the present invention; Figure 2 This is a functional module diagram of a deep tunnel anchorage zone stability evaluation system provided in one embodiment of the present invention. Detailed Implementation

[0013] 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.

[0014] Reference Figure 1 The diagram shown is a flowchart illustrating a method for evaluating the stability of anchorage zones in deep roadways according to an embodiment of the present invention. In this embodiment, the method for evaluating the stability of anchorage zones in deep roadways includes: S1. Obtain stratigraphic data of the deep tunnel anchorage zone and identify key strata based on the stratigraphic data.

[0015] In this embodiment of the invention, the deep tunnel anchorage zone is a surrounding rock area with bearing capacity formed by anchoring the surrounding rock with support components such as anchor bolts and anchor cables after the deep tunnel is excavated. It is the core area that ensures the stability of the deep tunnel under complex geological conditions such as high ground stress and high permeability pressure. The stratigraphic data can be geological profiles and layered data, as well as rock mechanical parameter data.

[0016] Furthermore, the key strata location of the support can be preliminarily predicted based on stratigraphic data using key stratum theory calculation formulas, FLAC3D, or 3DEC numerical simulations. The key strata location can be the range of rock strata (layers 1 to i) below the caving zone.

[0017] S2. Based on the key layer location, a real-time monitoring wireless transmission system and a densely arranged magnetic ring are installed at the working face of the deep roadway anchorage zone; the first observation data is collected based on the real-time monitoring wireless transmission system.

[0018] In this embodiment of the invention, observation holes are constructed in advance outside the influence range of the pre-stress of the working face according to the key layer position. A mine-use intrinsically safe magnetostrictive multi-point displacement real-time monitoring wireless transmission system (using a wireless communication method suitable for underground coal mines, such as mine-use intrinsically safe WiFi, LoRa, ZigBee, UWB, or one or more combinations of proprietary protocols 915MHz / 2.4GHz) is installed in the holes. Magnetic rings are densely arranged in the predicted key layer position section. Continuous monitoring is performed throughout the entire working face advance process: the entire process is as follows: observation holes advance the working face → the working face advances to the observation holes → the observation holes are located in the goaf behind. The roof linkage relationship is monitored throughout the entire process, the key layer is identified, and the progressive fracture time difference Δt and the critical layer step distance l are obtained. The progressive fracture time difference Δt and the critical layer step distance l are collected to obtain the first observation data.

[0019] S3. Identify the key layer based on the first observation data, construct the second observation hole in the deep roadway anchorage zone based on the key layer, and collect the second detection data based on the second observation hole.

[0020] In this embodiment of the invention, a second observation hole is constructed in the roof of the roadway, and distributed real-time force measuring anchors (cables) are installed. The anchors (cables) are anchored along their entire length, and the measuring points are densely arranged in key strata. Based on the real-time monitoring axial force data, the anchor force pi and the rock stratum movement amplitude ri of each rock stratum segment are obtained. The anchor force pi and the rock stratum movement amplitude ri of each rock stratum segment are collected to obtain the second monitoring data.

[0021] S4. After the key layer is cut off and depressurized, the third and fourth observation holes are constructed in the deep roadway anchorage zone.

[0022] In this embodiment of the invention, after drilling to cut the top and relieve pressure on the key layer or at the location of the support reinforcement design change, the third observation hole and the fourth observation hole are constructed respectively.

[0023] S5. Collect real-time monitoring data of the key layer using the third and fourth observation holes.

[0024] In this embodiment of the invention, the third observation hole is equipped with a magnetostrictive multi-point displacement real-time monitoring wireless transmission system that is exactly the same as the first observation hole. The movement of the key layer is monitored in real time throughout the entire process. Based on the linkage relationship of the top plate throughout the entire process, the progressive fracture time difference ▽T of the top plate after top cutting / strengthening and the step distance L of the key layer are obtained. The fourth observation hole is equipped with the same distributed real-time force measuring anchor (cable) as the second observation hole, using a full-length anchoring method. The anchor (cable) is located in key strata with densely arranged measuring points. Based on the real-time monitoring axial force data, the anchor cable force Pi and the strata movement amplitude Ri of each stratum section are obtained.

[0025] S6. Calculate the stability index value of the deep roadway anchorage zone based on the first observation data, the second observation data, and the real-time monitoring data.

[0026] In this embodiment of the invention, the roof cutting and pressure relief effect and the stability of the roadway anchorage zone are comprehensively judged based on indicators such as (▽t, l, pi, ri) and (▽T, L, Pi, Ri): 1. Time difference: ▽t-▽T; 2. Time factor: ▽T / ▽t; 3. Stride difference: lL; 4. Stride factor: L / l; 5. Axial force difference: pi-Pi; 6. Axial force factor: Pi / pi; 7. Motion amplitude difference: ri-Ri; 8. Motion amplitude factor: Ri / ri.

[0027] like Figure 2 The diagram shown is a functional block diagram of a stability evaluation system for deep roadway anchorage zones provided in an embodiment of the present invention.

[0028] The deep tunnel anchorage zone stability evaluation system 100 of this invention can be installed in a processing device. Depending on the functions implemented, the deep tunnel anchorage zone stability evaluation system 100 may include a key layer identification module 101, a first observation data acquisition module 102, a second observation data acquisition module 103, an observation hole construction module 104, a real-time monitoring data acquisition module 105, and a stability index value calculation module 106. 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 an electronic device processor and perform a fixed function, stored in the memory of the electronic device.

[0029] 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 deep roadway anchorage zone and identify key layer locations based on the stratigraphic data. The first observation data acquisition module 102 is used to set up a real-time monitoring wireless transmission system and densely arrange magnetic rings at the working face of the deep roadway anchorage zone according to the key layer position; and to acquire first observation data according to the real-time monitoring wireless transmission system and the real-time monitoring wireless transmission system. The second observation data acquisition module 103 is used to identify key layers based on the first observation data, construct second observation holes in the deep roadway anchorage zone based on the key layers, and acquire second detection data based on the second observation holes; The observation hole construction module 104 is used to construct the third and fourth observation holes in the deep roadway anchorage zone after the key layer is cut off and depressurized. The real-time monitoring data acquisition module 105 is used to acquire real-time monitoring data of the key layer based on the third observation hole and the fourth observation hole; The stability index calculation module 106 is used to calculate the stability index value of the deep roadway anchorage zone based on the first observation data, the second observation data, and the real-time monitoring data.

[0030] 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 evaluating the stability of anchorage zones in deep roadways, characterized in that, include: Obtain stratigraphic data of the deep tunnel anchorage zone, and identify key strata based on the stratigraphic data; A real-time monitoring wireless transmission system and a densely arranged magnetic ring are installed at the working face of the deep roadway anchorage zone according to the key layer location; the first observation data is collected according to the real-time monitoring wireless transmission system; Based on the first observation data, a key layer is identified, and based on the key layer, a second observation hole is constructed in the anchorage zone of the deep roadway. Based on the second observation hole, second detection data is collected. After the key layer is depressurized by cutting the top, the third and fourth observation holes are constructed in the deep roadway anchorage zone. Real-time monitoring data of the key layer are collected using the third and fourth observation holes. The stability index value of the deep roadway anchorage zone is calculated based on the first observation data, the second observation data, and the real-time monitoring data.

2. A stability evaluation system for anchorage zones in deep roadways, characterized in that, include: The key layer location identification module is used to acquire stratigraphic data of the anchorage zone in deep tunnels and identify key layer locations based on the stratigraphic data. The first observation data acquisition module is used to set up a real-time monitoring wireless transmission system and densely arrange magnetic rings at the working face of the deep roadway anchorage zone according to the key layer position; and to acquire first observation data based on the real-time monitoring wireless transmission system and the real-time monitoring wireless transmission system. The second observation data acquisition module is used to identify key layers based on the first observation data, construct second observation holes in the deep roadway anchorage zone based on the key layers, and acquire second detection data based on the second observation holes. The observation hole construction module is used to construct the third and fourth observation holes in the deep roadway anchorage zone after the key layer is cut off and depressurized. The real-time monitoring data acquisition module is used to acquire real-time monitoring data of the key layer based on the third observation hole and the fourth observation hole; The stability index value calculation module is used to calculate the stability index value of the deep roadway anchorage zone based on the first observation data, the second observation data, and the real-time monitoring data.

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.

Images