Testing system and method for supporting model of large arch flexibly and uniformly loaded tunnel

Abstract

The invention discloses a testing system and method for a supporting model of a large arch flexibly and uniformly loaded tunnel. The testing system comprises a reaction wall model, an arch testing rack, a data acquisition and hydraulic control device and a data terminal. The reaction wall model is arranged in a pit which is dug in advance in a pouring mode. The arch testing rack is connected with the reaction wall model. The data terminal controls the arch testing rack through the data acquisition and hydraulic control device. The arch testing rack comprises a plurality of flexible and uniform loading devices which are arranged in different directions. The flexible and uniform loading devices are connected with the reinforced concrete reaction wall model. The testing system and method have the advantages that simulation of full-fracture-surface multi-direction flexible and uniform loading of the tunnel can be realized, and the loading mode is more approximate to the actual stress conditions of a tunnel supporting structure; the testing system and method also have the advantages that the construction cost is low, assembly and disassembly are easy, the tunnel excavation size is large, the loading modes are diversified, the adaptability is high, the automation degree is high, and data accuracy is high.

Description

technical field [0001] The invention relates to a large-scale geotechnical engineering model test system, in particular to a support model test system and method for large-scale arched flexible uniformly loaded tunnels in geotechnical engineering. Background technique [0002] In recent years, with the extensive development of domestic geotechnical engineering, a large number of geomechanical model test techniques are also in the ascendant. Although in China, Tsinghua University, Wuhan University, and the Third Research Institute of the General Staff Engineering Corps have successively carried out different geomechanics model tests on many large-scale engineering projects in China, and have achieved a large number of scientific research results. However, there are very few large-scale model test studies specifically for tunnel support in geotechnical engineering. [0003] In actual engineering construction, tunnel support damage and parameter optimization are directly relat...

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Problems solved by technology

Triaxial loading needs to consider the boundary effect. Generally, the test frame is very large, but the excavation size of the tunnel is very small, which cannot well meet the requirements of the tunnel support structure.

The existing large-scale geomechanics model test system for geotechnical engineering is generally three-axis (X, Y, Z) or XY-axis loading in terms of loading methods, which cannot well meet the requirements of tunnel support model tests

Moreover, the existing geomechanics model test system has a large volume due to the consideration of boundary effects, but the tunnel excavation size is very small, which is not suitable for tunnel support model test research

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