Testing device and method of ground deformation caused by simulating metro shield tunnel construction

Abstract

The invention discloses a testing device and a method of ground deformation caused by simulating metro shield tunnel construction, and belongs to the technical field of underground engineering experiments. The overall process that similar materials are used for simulating soil layer structures, a tunnel simulating device is used for simulating tunnel structures, and a ground loss simulation system is used for simulating disturbed soil around a tunnel and ground loss is included. After the installation of the device is completed, the ground loss simulation system is started, an airtight water bag which is filled with water by using a pressure water pump in advance is drained step by step through a drain pipe, and water discharge is accurately controlled through a water stop valve and a measuring tank. Moreover, the water discharge is recorded, the ground loss is simulated, a corresponding stratum is deformed, and then the earth surface subsides, the surface subsidence is accurately measured through a dial indicator, and a measured value is recorded. Stratum loss ratio is calculated out through conversion, and the stratum loss ratio and the subsidence measured value are made into forms and images together, and thereby the relation between the stratum loss ratio under different stratum structures and the surface subsidence can be measured out simply, conveniently and accurately.

Description

Technical field: [0001] The invention belongs to the technical field of underground engineering experiments, can simulate the process of formation deformation caused by shield tunnel construction, simply and accurately describe the relationship between the surface settlement displacement S and the formation loss rate P, and provide a basis for the optimization of design and construction schemes. It can effectively predict the potential safety hazards of existing buildings and structures around the construction site. Background technique: [0002] In the existing shield tunnel construction model experiment technology, most of them focus on the shield tunneling machine model technology, loading technology, three-dimensional photogrammetry technology for model deformation, digital photo deformation measurement technology, and research on the ratio of tunnel model materials. It mainly solves the stress problem of the segment structure, the interaction problem between the tunnel ...

AI Technical Summary

Problems solved by technology

[0003] In the existing simulation devices and methods, there is a common shortcoming, that is, it is impossible to realize the simple and accurate control of the formation loss when simulating the construction of the shield tunnel, and correspondingly, the formation loss rate and the overlying rock and soil mass cannot be obtained. exact relationship between deformations

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