Model test device of excavating tunnel in transparent soil foundation and test method

Abstract

The invention discloses a model test device of excavating a tunnel in a transparent soil foundation and a test method. The model test device comprises a model groove, transparent soil, segmented water bags, industrial cameras, laser emitters and a laser movement track; the transparent soil is placed in the organic glass model groove; and the segmented water bags, each of which is provided with a water drainage pipe and a valve, are embedded in the transparent soil. According to the model test device, a tunnel part to be excavated is simulated through the water bags embedded in the model groove, and the tunnel excavating process is simulated through drainage of the water bags. A test method comprises the following steps that the water bags are drained one by one, the industrial cameras are adopted to photograph a laser plane in the drainage process, the three-dimensional deformation characteristic is obtained through software analysis and the like. According to the model test device and the test method, an underground tunnel excavating process needing a very large practical operation space can be simulated through one model test, so that the model is simple, the use is convenient, the test cost is low, and the simulation effect is good; and in addition, internal deformation of a soil body can be measured in real time with high accuracy, and a three-dimensional deformation field is obtained.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a model test device for tunnel excavation in a transparent soil foundation and a use method thereof. Background technique [0002] When excavating tunnels in sandy soil with strong fluidity, due to the low strength of the soil, when the tunnel section is large, it is easy to cause the excavation surface to be unstable, which may lead to excessive surface settlement and cause the surrounding buildings to tilt Or cracking, bringing a lot of economic losses. [0003] However, since the tunnel is buried underground, the general model test cannot observe the deformation of the foundation around the tunnel, but can only obtain the settlement change of the surface. If measuring instruments such as displacement meters are used, the displacements of some key points inside can be obtained, while the displacements outside these points can only be estimated. If the sel...

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Problems solved by technology

Before the present invention, transparent soil technology was mainly used to simulate the piling construction process, slope sliding, etc., and there were few reports on the simulation of underground building structure construction.

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