Three-dimensional model tunnel test device for simulating tunnel excavation and compensation grouting process

Abstract

The invention discloses a three-dimensional model tunnel test device for simulating a tunnel excavation and compensation grouting process. The three-dimensional model tunnel test device comprises a fixed barrel and an inner threaded hole matched with a lead screw, wherein a shaft sleeve comprises a circular platform part; the fixed barrel is provided with a plurality of groups of through holes; ejector rods are arranged in all the through holes, and slide along the through holes; a plurality of open elastic rings which are adjacent in sequence sleeve the fixed barrel; one end of each ejector rod is in close contact with the outer surface of the shaft sleeve; the other ends of the ejector rods are in close contact with the inner surfaces of the open elastic rings. By adopting the three-dimensional model tunnel test device, the application of a mechanical tunnel to tunnel model test is expanded, ring-by-ring contraction and expansion of the tunnel can be realized, and simulation of actual engineering is more vivid. Meanwhile, an actual duct piece is simulated through the open elastic rings, so that the roundness of the external profile of the tunnel in a test process is ensured, and finer test is realized; the three-dimensional model tunnel test device has great importance to indoor model test research for simulating the tunnel excavation and compensation grouting process.

Description

technical field [0001] The invention relates to a test device in geotechnical engineering, in particular to a three-dimensional model tunnel test device for simulating tunnel excavation and compensating grouting process. Background technique [0002] With the acceleration of the construction of modern cities in my country, the demand for underground rail transit construction is increasing and the development is getting faster and faster. At present, the most widely used method for subway tunnel construction is the shield tunneling method. For the engineering evaluation and evaluation of shield tunneling method construction , mainly empirical formula method, finite element numerical simulation, and model test method can be used. Among them, the model test method has unique advantages and has great room for improvement. [0003] First, model testing is a very important method for studying the key technologies of shield tunnel construction. For the research and verification of k...

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Problems solved by technology

In addition, the above-mentioned test device can only realize the expansion and contraction of the tunnel as a whole, and is suitable for a two-dimensional model test assumed to be a plane strain problem. In the actual process, the segments are assembled ring by ring, and the construction process is three-dimensional. Therefore, The application of this device is very limited

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