Underground engineering surrounding rock-stress linkage regulation method

Abstract

This invention provides a method for the coordinated control of surrounding rock and stress in underground engineering. This method is used to study the correlation between deep and shallow surrounding rock in underground engineering. It includes: optimizing the excavation and support methods, timing, and intensity to mobilize the joint bearing capacity of shallow and deep surrounding rock based on the correlation between the stage characteristics of the surrounding rock fracturing process and the effect of shallow support; the correlation between the degree of radial stress concentration and circumferential stress distribution in the surrounding rock and the fracturing and support of the surrounding rock; and the correlation between the overall stability of the surrounding rock and the effect of deep support. It also involves establishing a monitoring system and quantitative indicators for surrounding rock stress, deformation, and fracturing, achieving measurable, knowable, and controllable stress transfer safety control throughout the entire life cycle of underground engineering, and achieving the goal of optimal overall cavern safety and optimal excavation and support schemes, thereby improving the stability of surrounding rock in actual engineering projects.

Description

Technical Field

[0001] This invention belongs to the field of geotechnical engineering technology, and in particular relates to a method for coordinated control of surrounding rock and stress in underground engineering. Background Technology

[0002] As transportation, mineral resource extraction, and energy development expand from above ground to deeper underground, the impact of overlying strata, high confining pressure, and intense underground construction disturbances on underground engineering is becoming increasingly severe. The geomechanical environment of deep surrounding rocks is becoming more and more complex, and deep high-stress tunnels are exhibiting a series of engineering problems such as discontinuous, uncoordinated large deformations, and large-scale instability and failure. Instability and failure control of deep surrounding rocks have become a research hotspot.

[0003] Due to the complexity of the geological environment in which underground engineering projects are located, the mechanism of the interaction between the support and the surrounding rock in tunnel support design is not yet clear. There is a lack of scientific theoretical guidance in support design methods, making quantitative design difficult. Design schemes obtained through either empirical design or theoretical analysis differ from actual conditions. Therefore, a renewed understanding of the surrounding rock conditions and support schemes is crucial. By analyzing the correlation between stress transfer in the surrounding rock and active stability control of shallow surrounding rock in underground engineering projects, and establishing the mechanism of the support-surrounding rock interaction, the optimization and stability control of support design in underground engineering projects can be achieved. Summary of the Invention

[0004] The purpose of this invention is to provide a method for coordinated control of surrounding rock and stress in underground engineering, addressing the shortcomings of existing technologies.

[0005] Therefore, the above-mentioned objective of the present invention is achieved through the following technical solution:

[0006] A method for coordinated control of surrounding rock and stress in underground engineering is characterized by the following: The method is used to study the correlation between deep and shallow surrounding rock in underground engineering, including: optimizing excavation and support methods, timing, and intensity to mobilize the joint bearing capacity of shallow and deep surrounding rock based on the correlation between the stage characteristics of the surrounding rock fracturing process and the effect of shallow support, the correlation between the degree of radial stress concentration and circumferential stress distribution of the surrounding rock and the fracturing and support, and the correlation between the overall stability of the surrounding rock and the effect of deep support; establishing a monitoring system and quantitative indicators for surrounding rock stress, deformation, and fracturing; and achieving measurable, knowable, and controllable stress transfer safety control throughout the entire life cycle of underground engineering. Specifically, it includes the following steps:

[0007] S1. Based on the correlation between the stage characteristics of the surrounding rock fracturing process in underground engineering and the effect of shallow support, the shallow surrounding rock fracturing is limited to a controllable level, and shallow support surface is used to achieve safe control of stress transfer.

[0008] S2. Based on the correlation between the degree of radial stress concentration and circumferential stress uniformity of the surrounding rock and the fracture and support of the surrounding rock, actively control the transfer of stress uniformity to the deeper layers of the surrounding rock to achieve peak reduction and pressure equalization through safe regulation of stress transfer.

[0009] S3. Based on the correlation between the overall stability of the surrounding rock and the effect of deep support, actively reinforce the shallow surrounding rock and ensure the integrity of the deep surrounding rock to achieve the expansion of the stress transfer safety control and the overall load-bearing capacity.

[0010] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0011] As a preferred embodiment of the present invention, the correlation between the stage characteristics of the surrounding rock fracturing process in underground engineering and the shallow support effect in step S1 specifically includes:

[0012] S101. Based on the engineering results of typical major projects, study the mechanism of surrounding rock instability and failure;

[0013] S102. Determine the stability control principle of the surrounding rock in underground engineering based on the instability mechanism, including the improvement of surrounding rock conditions, control of construction disturbance, treatment of groundwater, and rational design of support structure.

[0014] As a preferred embodiment of the present invention, step S1 specifically includes the following steps:

[0015] S111. Based on the engineering results of typical major projects, study the correlation between the stage characteristics of the surrounding rock fracture stage and the shallow support effect in the surrounding rock-stress linkage control method of underground engineering.

[0016] S112. Based on the research patterns and the stress, strain, and fracture information monitored at the engineering site, analyze the current degree of rock fracture and determine the shallow support measures and key reinforcement areas for the actual project.

[0017] As a preferred embodiment of the present invention, step S2 specifically includes the following steps:

[0018] S211. Based on the engineering results of typical major projects, research patterns were developed on the correlation between the degree of radial stress concentration and the degree of circumferential stress uniformity of the surrounding rock and the fracture and support of the surrounding rock in the method of linkage control of surrounding rock and stress in underground engineering.

[0019] S212. Monitor the degree of fracture, stress and strain information of the surrounding rock during the actual engineering excavation process. Through numerical simulation, the radial stress concentration and circumferential stress distribution of the surrounding rock in the actual engineering can be determined. In the project, the joint bearing capacity of the support structure and the surrounding rock can be strengthened by optimizing the excavation support method, timing and strength. Alternatively, methods such as cutting, drilling and bottom blasting can be used to decompress the surrounding rock of the tunnel.

[0020] As a preferred embodiment of the present invention, step S3 specifically includes the following steps:

[0021] S311. Based on the engineering results of typical major projects, analyze the failure range of shallow support, appropriately increase deep support, and form a research law on the correlation between the overall stability of the surrounding rock and the effect of deep support in the method of linkage control of surrounding rock and stress in underground engineering.

[0022] S312. Monitor the degree of fracture, stress and strain information of deep surrounding rock during actual engineering excavation, monitor the deformation information of shallow support, analyze the degree and range of stress redistribution using numerical simulation methods, and determine the increased range and form of deep support based on the underground engineering surrounding rock-stress linkage control method.

[0023] This invention provides a method for the coordinated control of surrounding rock and stress in underground engineering. By analyzing the instability and failure mechanism of the surrounding rock, in-situ monitoring (e.g., stress, strain, and fracture information from on-site engineering monitoring), and numerical calculation results, a "dual-objective" proactive safety control method for the joint control of surrounding rock and stress in underground engineering is established. This invention proposes the correlation between stress transfer in underground engineering surrounding rock and proactive control of shallow surrounding rock stability. Through methods such as shallow surface support, peak pressure reduction and equalization, expanding the support ring and strengthening the foundation, and overall bearing capacity, the lifecycle of stress transfer safety control in underground engineering can be measured, known, and controlled. This achieves the goals of optimal overall cavern safety and optimal excavation and support schemes, thereby improving the stability of surrounding rock in actual engineering projects. Attached Figure Description

[0024] Figure 1 A flowchart illustrating the underground engineering surrounding rock-stress linkage control method provided by the present invention;

[0025] Figure 2 The flowchart is shown in a specific embodiment of the present invention. Detailed Implementation

[0026] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] A method for coordinated control of surrounding rock and stress in underground engineering is characterized by the following steps: Based on the correlation between the stage characteristics of the surrounding rock fracturing process and the effect of shallow support, the correlation between the degree of radial stress concentration and circumferential stress distribution of the surrounding rock and the fracturing and support, and the correlation between the overall stability of the surrounding rock and the effect of deep support, the method optimizes the excavation and support methods, timing, and intensity to mobilize the joint bearing capacity of shallow and deep surrounding rock; establishes a monitoring system and quantitative indicators for surrounding rock stress, deformation, and fracturing; and achieves measurable, knowable, and controllable stress transfer safety control throughout the entire life cycle of underground engineering.

[0028] Step S1 specifically includes the following steps:

[0029] a. Collect results from multiple typical major underground engineering projects, including results from in-situ monitoring, in-situ testing, and indoor testing;

[0030] b. Based on the results of in-situ and laboratory tests in typical engineering projects, analyze the staged fracture mechanism of the surrounding rock in typical engineering projects;

[0031] c. Based on the stress, strain and fracture information of the surrounding rock from in-situ monitoring of typical projects, analyze the control effect of different support forms (including support type, timing, length, strength, etc.) on the degree of fracture of the surrounding rock in typical projects, and obtain the support-surrounding rock interaction mechanism;

[0032] Based on the above research patterns and existing engineering geological data, the optimal monitoring system for the existing project is formulated through numerical simulation. The degree of rock fracturing and stress transfer of the existing project are analyzed, and the shallow support measures and key reinforcement areas of the existing project are determined.

[0033] Step S2 specifically includes the following steps:

[0034] Based on the typical engineering support-surrounding rock interaction mechanism and the existing engineering in-situ monitoring system, analyze the degree of fracture, stress concentration, stress concentration range and stress transfer depth of the existing engineering surrounding rock, dynamically correct and optimize the excavation scheme, and implement thin-layer shotcrete and short anchor bolt support measures for shallow surrounding rock.

[0035] b. In cases where the stress concentration in existing engineering projects is very high, methods such as cutting, drilling, and bottom blasting can be used to relieve the pressure on the surrounding rock of the existing engineering projects, thereby expanding the stress concentration area and reducing the degree of stress concentration.

[0036] Step S3 specifically includes the following steps:

[0037] Based on the typical engineering support-surrounding rock interaction mechanism and the existing engineering in-situ monitoring system, the degree of fracturing of shallow surrounding rock and the degree of stress concentration of deep surrounding rock in the existing engineering are analyzed, the mechanical parameters of surrounding rock in the existing engineering are inverted, and the excavation support scheme is optimized again through numerical simulation.

[0038] b. By implementing measures such as long anchor bolts, anchor cables, wire mesh, thick-layer shotcrete, and grouting in the existing project, the bearing capacity of the surrounding rock of the existing project is strengthened, so as to achieve the combined bearing capacity of the shallow and deep surrounding rock of the existing project and achieve the goal of optimal overall safety of the tunnel and optimal excavation and support scheme.

[0039] The above specific embodiments are used to explain and illustrate the present invention, and are only preferred embodiments of the present invention, not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made to the present invention within the spirit and scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A method for coordinated control of surrounding rock and stress in underground engineering, characterized in that: The method for coordinated control of surrounding rock and stress in underground engineering includes: based on the correlation between the stage characteristics of the surrounding rock fracturing process and the effect of shallow support, the correlation between the degree of radial stress concentration and circumferential stress distribution of the surrounding rock and the fracturing and support, and the correlation between the overall stability of the surrounding rock and the effect of deep support, optimizing the excavation and support methods, timing, and intensity to mobilize the joint bearing capacity of shallow and deep surrounding rock; establishing a monitoring system and quantitative indicators for surrounding rock stress, deformation, and fracturing; and achieving measurable, knowable, and controllable stress transfer safety control throughout the entire life cycle of underground engineering. Specifically, it includes the following steps: S1. Based on the correlation between the stage characteristics of the surrounding rock fracturing process in underground engineering and the effect of shallow support, the shallow surrounding rock fracturing is limited to a controllable level, and shallow support surface is used to achieve safe control of stress transfer. S2. Based on the correlation between the degree of radial stress concentration and circumferential stress uniformity of the surrounding rock and the fracture and support of the surrounding rock, actively control the transfer of stress uniformity to the deeper layers of the surrounding rock to achieve peak reduction and pressure equalization through safe regulation of stress transfer. S3. Based on the correlation between the overall stability of the surrounding rock and the effect of deep support, actively reinforce the shallow surrounding rock and ensure the integrity of the deep surrounding rock to achieve the expansion of the stress transfer safety control and the overall load-bearing capacity.

2. The method for coordinated control of surrounding rock and stress in underground engineering according to claim 1, characterized in that: The correlation between the stage characteristics of the surrounding rock fracturing process in underground engineering and the effect of shallow support in step S1 specifically includes: S101. Based on the engineering results of typical major projects, study the mechanism of surrounding rock instability and failure; S102. Determine the stability control principle of the surrounding rock in underground engineering based on the instability mechanism, including the improvement of surrounding rock conditions, control of construction disturbance, treatment of groundwater, and rational design of support structure.

3. The method for coordinated control of surrounding rock and stress in underground engineering according to claim 1, characterized in that: Step S1 specifically includes the following steps: S111. Based on the engineering results of typical major projects, study the correlation between the stage characteristics of the surrounding rock fracture stage and the shallow support effect in the surrounding rock-stress linkage control method of underground engineering. S112. Based on the research patterns and the stress, strain, and fracture information monitored at the engineering site, analyze the current degree of rock fracture and determine the shallow support measures and key reinforcement areas for the actual project.

4. The method for coordinated control of surrounding rock and stress in underground engineering according to claim 1, characterized in that: Step S2 specifically includes the following steps: S211. Based on the engineering results of typical major projects, research patterns were developed on the correlation between the degree of radial stress concentration and the degree of circumferential stress uniformity of the surrounding rock and the fracture and support of the surrounding rock in the method of linkage control of surrounding rock and stress in underground engineering. S212. Monitor the degree of fracture, stress and strain information of the surrounding rock during the actual engineering excavation process. Through numerical simulation, the radial stress concentration and circumferential stress distribution of the surrounding rock in the actual engineering can be determined. In the project, the joint bearing capacity of the support structure and the surrounding rock can be strengthened by optimizing the excavation support method, timing and strength. Alternatively, the surrounding rock of the tunnel can be depressurized by cutting, drilling and bottom blasting.

5. The method for coordinated control of surrounding rock and stress in underground engineering according to claim 1, characterized in that: Step S3 specifically includes the following steps: S311. Based on the engineering results of typical major projects, analyze the failure range of shallow support, appropriately increase deep support, and form a research law on the correlation between the overall stability of the surrounding rock and the effect of deep support in the method of linkage control of surrounding rock and stress in underground engineering. S312. Monitor the degree of fracture, stress and strain information of deep surrounding rock during actual engineering excavation, monitor the deformation information of shallow support, analyze the degree and range of stress redistribution using numerical simulation methods, and determine the increased range and form of deep support based on the underground engineering surrounding rock-stress linkage control method.

Images