Device and method for testing three-dimensional damage mode of tunnel face soil of cross-river and cross-sea shield tunnel

Abstract

The invention discloses a device and a method for testing a three-dimensional damage mode of a tunnel face soil body of a cross-river and cross-sea shield tunnel. The device comprises a model box, a transmission device and a testing system, and the model box comprises a main box body (1), a steel support (2) and an excavation module (3). The main box body is composed of a soil filling box (51) and a water tank (52) and installed above the steel support. The excavation module is composed of a model tunnel (31) and a movable baffle (32), located in the soil filling box, connected with the side wall of the soil filling box and used for simulating the displacement mode of an excavation face in the actual shield tunneling process. The transmission device comprises a gear motor (13), a gear set (14) and a screw rod (15), and the operation of the excavation module is controlled through the transmission device. The testing system comprises an x-ray emission device (16) and an observation device (17) and is used for observing the three-dimensional damage process of the soil body. The method comprises the following steps: leveling a field, arranging equipment, preparing a soil sample, saturating the soil body, forming seepage, testing, recording data, cleaning a filling box and repeatedly testing.

Description

technical field [0001] The invention relates to a three-dimensional failure mode testing device and method for the face of a shield tunnel crossing a river and sea, and belongs to the technical field of shield tunnels. Background technique [0002] With the implementation of the national marine strategy, the national large channel construction plan, and the rapid development of coastal city construction, a large number of cross-river and sea-crossing tunnel projects have emerged, and the scale of the project and the pressure of the overlying water are also increasing. In the construction of cross-river and sea tunnels, the shield tunneling method has obvious advantages due to its fast construction speed and low environmental impact. However, the construction process of shield tunnels across rivers and seas will inevitably be affected by seepage. As a body force, seepage force acts on the soil skeleton of the tunnel face, which will greatly change its deformation and failure...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is, in order to solve the problem of how to obtain the three-dimensional failure mode of soil on the face of the actual s

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