Tunnel three-dimensional stress field simulator

Abstract

The invention relates to a tunnel three-dimensional stress field simulator, which comprises a test box, lifting jacks and a hydraulic loading and control device, wherein the test box is arranged in a frame-shaped loading beam; a front loading plate is arranged in front of the test box; a rear loading plate is arranged on a rear wall of the test box; the peripheries of the front loading plate and the rear loading plate are connected through pull rods; the lifting jacks are respectively and fixedly arranged on an inner side of the loading beam and an inner surface of the front loading plate; two longitudinal support steel rails are arranged on a bottom part of the loading beam; and pulleys on bottom parts of the front loading plate and the rear loading plate are matched with the support steel rails. The device preferably simulates a three-dimensional surrounding rock stress field of a stratum where a shield tunnel and a mining method tunnel are located, and realizes construction simulation of excavation, support and the like of tunnel engineering under the condition of the three-dimensional stress field, so that the disturbance influence of construction on the surrounding rocks is researched, the stress performance of a tunnel structure under the condition of a complex stress field is analyzed, a more reliable test basis is provided for the design and the construction of the tunnel, and further the safety and the economy of the tunnel are ensured better.

Description

technical field [0001] The invention relates to model test equipment for simulating the three-dimensional stress field of surrounding rock in the tunnel construction and operation stages. Background technique [0002] The three-dimensional stress field simulator of the tunnel is used to carry out the model test of the tunnel construction excavation and the mechanical characteristics of the structure, so as to analyze and obtain the dynamics of the surrounding rock of the tunnel excavation strata, the working behavior, failure characteristics, safety and durability of the lining structure of the operating tunnel. It is of great significance to provide experimental basis for tunnel design and construction. [0003] The existing tunnel stress field simulation system is mainly a plane strain simulation system, which can only simulate the tunnel stress field in one plane by laterally loading similar materials in the test chamber through the side loading device. It is usually use...

AI Technical Summary

Problems solved by technology

It is usually used when the level of surrounding rock and the buried depth of the tunnel are almost constant, and it is impossible to simulate the complex three-dimensional stress form of most tunnels, especially the longitudinal or oblique structural stress form of the tunnel, and of course it is even less able to simulate the tunnel construction. The mechanical properties of the process face and the spatial state of the cavity structure

[0004] At present, there are also a few 3D stress field simulation systems in China. The 3D stress situation is simple in design and simulation, and the simulated tunnel structure has a single section shape. It can simulate various section shapes and sizes of railways, highways, subways, etc At the same time, the simulated stress it can provide is small, and the on-site stress level converted according to the similarity ratio is not high. The simulation of the field must reduce the scale of the model, which leads to different degrees of distortion of the mechanical parameters collected by the model tunnel; it is impossible to simulate the freezing auxiliary construction method of the connecting cross passage of the subway in the city with rich water and weak strata or the cross passage of the cross-river and cross-sea tunnel

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