Transparent soil model testing apparatus for simulating tunnel excavation and testing method

Abstract

The invention relates to a transparent soil model testing apparatus for simulating tunnel excavation and a testing method. The device comprises a transparent model box, a rigid pipeline, a rubber membrane, a laser transmitter, a camera, an optical platform, a linear guide rail, a pressure controller and a computer, wherein the transparent model box is used for containing transparent soil; and oneend of the rigid pipeline penetrates into the transparent model box. The testing method comprises the following steps: opening a valve to inject water into the rigid pipeline, regulating the pressurecontroller to reach a design pressure, and controlling the pressure to maintain invariable; performing stepwise decompression, simulating the tunnel excavation process, irradiating the transparent soil by the laser transmitter after decompression stabilization, and shooting the continuous patterns by the camera after forming stable patterns; controlling the model box to move by a certain distanceon the linear guide rail, continuously shooting, and forming a spatial deformation pattern parallel to the laser irradiation plane; and processing the mutually parallel patterns so as to obtain a space displacement vector diagram of the laser patterns, and calculating to obtain the space strain diagram. According to the testing apparatus and testing method disclosed by the invention, the deformation field on any section of the tunnel can be continuously and efficiently measured in a non-contact manner.

Description

technical field [0001] The invention relates to a transparent soil model test device and a test method for simulating tunnel excavation, which are mainly suitable for tunnel excavation test simulation in clay and sandy soil layers, and belong to the indoor tunnel excavation model test technology of geotechnical engineering. Background technique [0002] Tunnel construction will cause engineering problems such as deformation of the surrounding soil, ground subsidence or uplift, and instability of the excavation surface. The model test uses a physical model entity, which is equivalent to the similarity principle, boundary conditions and initial conditions under laboratory conditions. The tunnel excavation process is simulated in the model tank or model box, and the tunnel is measured by embedded pressure sensors and displacement gauges. Excavate the deformation and pressure changes of the soil within the influence range, and analyze the deformation, strength and stability char...

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Problems solved by technology

However, when moving the laser, since the moving distance cannot be accurately controlled, and the laser beam may pose a threat to the safety of the experimenters during the moving of the laser, the position of the laser ne

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