Tunnel sectioned excavation simulation device for three-dimensional centrifugal model test

Abstract

A tunnel sectioned excavation simulation device for a three-dimensional centrifugal model test comprises a fixing and supporting system, a loading system, a supporting structure and a displacement monitoring system. The fixing and supporting system comprises a three-dimensional centrifugal model box, long vertical columns, a short vertical column, linkage crossbeams and a supporting crossbeam and is used for fixing the supporting structure and providing a support reaction force. The loading system comprises miniature hydraulic jacks, supporting rods and supporting cushion blocks and is positioned on the upper portion of the supporting crossbeam and in the supporting structure. The supporting structure is formed by an aluminum pipe and an arc aluminum sheet on the upper portion of the aluminum pipe, and the supporting structure is arranged above the fixing and supporting system. The displacement monitoring system comprises high-sensitivity displacement sensors and sensing extension rods and is adhered to the upper portion of the arc aluminum sheet. The tunnel sectioned excavation simulation device has advantages that ground loss ratios caused by shield tunneling can be accurately controlled and simulated, and continuous sectioned simulation of different ground loss ratios can be realized.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering model tests, and in particular relates to a simulated excavation device and an implementation method thereof in a three-dimensional centrifugal model test of shield tunnel construction in the field of geotechnical engineering. Background technique [0002] With the rapid development of urban modernization, urban traffic congestion and people's travel difficulties have become urgent problems to be solved. Urban subways are widely favored by people as an important means to relieve urban traffic pressure due to their advantages of fast, punctual, and large capacity. The construction of the subway can not only improve the traffic flow, reduce the environmental pressure caused by traffic congestion, but also protect the city's scenery, transfer part of the buildings on the surface to the ground, and expand the green area of ​​the city. important part of the process. But along with the...

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Problems solved by technology

[0004] Existing methods for simulating shield tunnel excavation in centrifugal model tests mostly use the method of injecting liquid into the tunnel model during the preparation stage of the release test, but this method is difficult to be accurate because a small amount of air is inevitably injected during the liquid injection stage. The stratum loss effect caused by tunnel excavation can be accurately controlled, and only a single stratum loss rate can be achieved in a single set of tests, but different degrees of stratum loss effects cannot be continuously achieved in a set of tests at the same time

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