Lining construction device and method in multi-arch tunnel divisional excavation model test

Abstract

The invention discloses a lining construction device and method in a multi-arch tunnel divisional excavation model test, solves the problem that in the prior art, in the model test, manual painting islarge in difficulty and construction quality is poor, and has the advantages that accuracy and quality of simulated lining construction are ensured, and simulation of lining construction in the depthof a grotto can be achieved. The scheme is as follows: the lining construction device in the multi-arch tunnel divisional excavation model test comprises a fixed platform, a mechanical arm and a lining mold base, wherein the mechanical arm is supported on the fixed platform, and the mechanical arm can move forwards or backwards relative to the fixed platform; the end part of the mechanical arm isconnected with one end of a casting sleeve; similar lining materials can be fed into the casting sleeve, and the distance of the casting sleeve with respect to the grotto to be supported and protected is adjustable; the other end of the casting sleeve can stretch into the lining mold case; the external shape of the lining mold base is accordant with the shape of the grotto to be supported and protected, and the lining mold base is provided with a plurality of lining windows used for jetting the similar lining materials; and the casting sleeve can be communicating with at least part of the lining windows.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a lining construction device and method for partial excavation model tests of multi-arch tunnels. Background technique [0002] Physical model test is a physical simulation method using scaled-scale models to study engineering construction based on the principle of similarity. It has become one of the commonly used scientific research methods in geotechnical engineering, tunnel engineering and other disciplines. The use of model tests to simulate tunnel engineering mainly includes the following steps: Prepare similar materials, fill and compact similar materials, bury monitoring components, continue to fill similar materials, section excavation and support, and collect monitoring information. [0003] Double-arch tunnel is one of the commonly used tunnel structures. Due to its large excavation section, the actual construction often adopts double-side wall pilot pit method,...

AI Technical Summary

Problems solved by technology

[0004] 1. At present, in the excavation model tests of large-section tunnels, the method of artificially applying similar lining materials on the inner wall of the excavation cavity is often used to simulate the tunnel lining construction. 50, 1:100 scale model), when the multi-arch tunnel adopts the partial excavation method, the section space of each pilot tunnel is narrow and the shape is different, and the method of manual smearing is difficult to implement;

[0005] 2. It is difficult to ensure the uniform thickness of the lining and the quality of the construction by manually applying similar materials for the lining. When the adhesion between the similar lining materials and the similar materials of the tunnel surrounding rock is not good, it is easy for the similar lining materials to fall off, which seriously affects progress of model testing;

[0006] 3. When the depth of the tunnel model cavity is large, it is difficult to implement similar lining materials in the depth of the model cavity, and it is not easy to observe the lining construction

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