Tunnel construction simulation plane strain model test device

Abstract

The invention discloses a tunnel construction simulation plane strain model test device, which comprises a model rack, a loading system and a data acquisition system, wherein the model rack is used for providing a space for accommodating test models and providing a counter force for the loading system; the loading system comprises a plurality of load bodies and is used for synchronously controlling different load bodies to perform a test for loading at least one set of load body on the test models; and the data acquisition system is used for testing the real-time displacement and pressure stress of the test models in the process of the loading test. The tunnel construction simulation plane strain model test device which is based on a 'loading-first and hole digging-second' test method can synchronously perform similar model tests of three test models with different parameters and loading conditions, adopts an air bag loading mode, solves the problems of nondurable stability of loading in the traditional tests and can regulate lateral pressure flexibly.

Description

technical field [0001] The invention relates to the technical field of underground engineering experiment instruments, in particular to a tunnel construction simulation plane strain model test bench device. Background technique [0002] Various research methods such as mathematical analysis, field test, numerical simulation and indoor model test can be used to study the mechanical characteristics of tunnel support structure and the stability of surrounding rock. Mathematical analytical methods can only provide theoretical solutions for simple projects such as physical models and their parameters and boundary conditions. With the development of computer hardware and software technology and mathematical algorithms, numerical simulation method has become a powerful tool for tunnel mechanics analysis and calculation. However, the numerical method is limited by the mechanical theory, calculation method and the development of computer software and hardware, so it has to be simpli...

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Problems solved by technology

[0004] (1) Most of them are model test benches based on the state of stratum self-weight, which cannot reflect the actual situation of stratum stress, especially the situation of high ground stress;

[0005] (2) For some test benches that can be loaded, the load-holding time cannot be sustained, and the load-holding stability of the load is insufficient, which cannot meet the needs of the model test in the whole process of tunnel excavation and support;

[0006] (3) It is impossible to consider or flexibly adjust the influence of formation lateral pressure on test results;

[0007] (4) Most of them are based on the test method of "opening first, then loading", which cannot reflect the basic phenomenon of redistribution of stratum displacement field and stress field caused by tunnel excavation;

[0008] (5) Each test can only be aimed at a single formation and support model, and it is not possible to realize comparative tests under different parameters and loading conditions of multiple models, etc.

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