Miniature TBM (Tunnel Boring Machine) excavation system for tunnel excavation in physical simulation test

Abstract

The invention relates to a miniature TBM (Tunnel Boring Machine) excavation system for tunnel excavation in a physical simulation test and belongs to the technical field of geotechnical engineering. The system comprises a cutter head, a protective shield, a gripper, a transmission shaft, a pulling jack, a guide rail, a motor, a base and the like; one end of the pulling jack is fixed to a support rack; a piston at the other end of the pulling jack is used for pulling the base and the motor to move forwards or backwards together; the motor is used for driving the transmission shaft to rotate to push the cutter head to move forwards to cut tunnel face rock mass; jacks on two sides of the gripper can push gripper arms to exert specified pressure to wall rock. The system can accurately simulate the rock breaking process of the cutter head, takes the interaction between the wall rock and the gripper, the interaction between the tunnel face and cutter head and the interaction between the wall rock and the protective shield into consideration, can be applied for simulating a shield TBM to excavate a soft rock tunnel, a subway or the like in a common geomechnical model test and can also be applied for simulating excavation of a TBM for a deep-lying hard rock tunnel to study the relationship between rock-machine interaction and rock burst.

Description

technical field [0001] The invention relates to a miniature TBM excavation system used for tunnel excavation of a physical simulation test, belonging to the technical field of geotechnical engineering. Background technique [0002] The physical simulation test is based on the similarity theory, on the basis of preparing similar materials, by loading, excavating, supporting, monitoring, etc. the model specimens, and studying the damage and stability of underground tunnels and factory buildings through scaled-down models , a research method that uses test results to guide on-site construction, together with laboratory tests, numerical analysis and site monitoring, constitutes four research methods of geotechnical engineering. The more similar the material properties of the model, the structural characteristics of the test piece, the loading method, and the excavation method to the prototype, the higher the reliability of the test results and the greater the reference for engin...

AI Technical Summary

Problems solved by technology

[0011] (3) The method of manual excavation is feasible for the simple test process, but when the excavation tunnel is long and there is concealed excavation, it is difficult to manually excavate in a narrow space

[0012] (4) The use of drilling rigs or micro-excavation equipment saves time, effort, and high efficiency, but the simple mechanical excavation method used and the rock-breaking mechanism of the cutter head and rock-machine interaction in the on-site mechanical excavation still exist. Big difference, can't do accurate simulation

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