A test system for simulating deformation and failure characteristics of tunnels

Abstract

The invention relates to a test system for simulating the deformation and failure characteristics of a tunnel. The test system comprises a tunnel secondary lining model used as a test object for simulating the structure of the tunnel; an external load resistance subsystem disposed on the periphery of the outer surface of the tunnel secondary lining model and used for applying a variable external load to the tunnel secondary lining model in order to simulate an interaction between a surrounding rock and the tunnel; a measurement subsystem disposed on the tunnel secondary lining model and used for acquiring relevant data before and after the external load resistance subsystem acts on the tunnel secondary lining model; and a servo controller connected with the external load resistance subsystem and the measurement subsystem, and used for receiving the relevant data acquired by the measurement subsystem and controlling the degree of the external load applied by the external load resistancesubsystem to the tunnel secondary liner model. Compared with the prior art, the test system has a high actual load environment simulation degree, high test accuracy and a high prototype matching degree.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering physical model tests, in particular to a test system for simulating deformation and failure characteristics of tunnels. Background technique [0002] Different from above-ground buildings such as bridges and industrial and civil buildings, underground structures such as tunnels are buried in complex rock-soil media, resulting in problems such as structural bearing capacity, mechanical properties, and interaction mechanisms with surrounding rock-soil bodies. Due to the large uncertainty, the results of pure theoretical analysis and numerical analysis are quite different from the actual situation of the project, so it is difficult to be used as an exact design basis. The physical model test is popular because it can better simulate the actual stress of the structure and the characteristics of deformation and damage, and effectively verify the rationality of the design and construction pla...

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Problems solved by technology

[0003] At present, with the rapid development of underground engineering technology and construction scale, more and more tunnel projects are built in weak and broken surrounding rocks or unfavorable geological sections. Deformation or even cracking will seriously affect the bearing safety and performance of the structure

At present, the research on the mechanical properties and reinforcement methods of structures with diseases is not deep enough, and the existing technologies are still immature, and the situations of "unreasonable treatment plan" and "fixing the symptoms but not the root cause" occur from time to time. The tunnel lining structure is truly simulated through indoor model tests Mechanical behavior, guidance, reinforcement and maintenance are becoming more and more urgent

At present, most of the experimental devices are mainly divided into two categories. One is the model test box based on the calculation theory of stratum structure. On the one hand, this kind of equipment cannot meet the large-scale model test, and on the other hand, it is difficult to simulate the actual load environment of the structure. , the similarity of the physical and mechanical parameters of the rock-soil medium is also difficult to achieve; another device is the test frame based on the load structure calculation theory, most of which regard the local lining as a stressed structure, ignoring the actual engineering The constraint effect of the surrounding strata on the structural deformation caused a large deviation in the final experimental results, and it was impossible to push back to the prototype; in addition, the current instruments and equipment involved in tunnel reinforcement and maintenance are less researched and have not been reported in detail

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