An experimental device for simulating the excavation of tunnels crossing faults

Abstract

The invention discloses an experimental device for simulating the excavation of a tunnel crossing a fault, comprising a test box body, a loading structure, a support structure, a force-transmitting steel plate, surrounding rock simulation materials, fault simulation materials, and a tunnel lining model; the experiment box body is without a cover Box-shaped structure; surrounding rock simulation materials, fault simulation materials, and tunnel lining models are all located in the experimental box; the tunnel lining model is equipped with differential digital display displacement gauges and strain-type earth pressure cells on the outside of the primary lining; one end of the loading structure is connected to the The support structure is connected, and the other end is connected to the force-transmitting steel plate; the force-transmitting steel plate is facing the opening surface of the experimental box, and is used to squeeze the surrounding rock simulation material in the experimental box. In the present invention, a plurality of pressure transmission blocks are movably connected to the bottom surface of the force transmission steel plate, and the pressure transmission block is driven by the driving member to move axially along the force transmission steel plate, and squeezes the surrounding rock simulation material in the experimental box, thereby adjusting the surrounding rock simulation material The local pressure improves the flexibility of experiment parameter adjustment.

Description

technical field [0001] The invention relates to the technical field of tunnel tests, in particular to an experimental device for simulating excavation of tunnels crossing faults. Background technique [0002] Before tunnel construction, it is often necessary to study construction mechanics, surrounding rock failure law and surrounding rock stability of fault fracture zone. Now relevant research mainly relies on simulation experiments and a variety of related simulation test devices have appeared, but there are some problems, such as the displacement synchronization control device and test method of the patent CN201610004012.0 for simulating tunnels crossing active faults, the buried depth of the tunnel, etc. The parameter is single and the control accuracy is not high, and the deviation of the test result is large; the patent CN201720868943.5 proposes a simulation experiment device for tunnel excavation across faults to solve this problem. Uneven surrounding rock pressure c...

AI Technical Summary

Problems solved by technology

Now relevant research mainly relies on simulation experiments and a variety of related simulation test devices have appeared, but there are some problems, such as the displacement synchronization control device and test method of the patent CN201610004012.0 for simulating tunnels crossing active faults, the buried depth of the tunnel, etc. The parameter is single and the control accuracy is not high, and the deviation of the test result is large; the patent CN201720868943.5 proposes a simulation experiment device for tunnel excavation across faults to solve this problem. Uneven surrounding rock pressure caused by elevation differences; the thickness and inclination of the fault can be flexibly controlled through gauze to obtain a more realistic fault model. This solution can study the quantitative impact of fault geology on the tunnel by controlling a single variable

However, there are still some problems: for example, it uses several short steel plates to exert pressure on the surrounding rock, and the short steel plates are supported by jacks to exert pressure. The number of steel plates is small, and the volume of the jack itself hinders and the space is limited. The pressure in the local subdivision area cannot be adjusted. At the same time, the short steel plate is arranged longitudinally along the experimental box, and the horizontal pressure cannot be adjusted at all.

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