Testing method of water pressure distribution law of subsea tunnel lining

Abstract

The invention discloses a testing method of water pressure distribution law of a subsea tunnel lining, and the method comprises the following steps: selecting similar materials to simulate a prototype tunnel surrounding rock mass and lining materials based on similarity theory, determining the shape of a testing template according to the shape of the cross section of the water pressure-resistant lining, and completing the making of a model; arranging measuring points of the model, adopting a fiber Bragg grating to collect strain data of the structure, and adopting a U-shaped mercury manometerto carry out data acquisition of water pressure; respectively realizing by controlling a hydraulic jack and the water pressure value of a water pressure gauge at a water inlet of the testing model; and respectively carrying out water pressure distribution on the back of the lining, secondary lining strain acquisition and water discharge acquisition. The testing method can reflect the characteristics of the water pressure distribution law on the back of the tunnel lining under the common function of a strain field and a seepage field, the secondary lining stress and the deformation.

Description

technical field [0001] The invention relates to the test field of tunnel structures, in particular to a method for testing the water pressure distribution law of the subsea tunnel lining. Background technique [0002] The main feature of submarine (underwater) tunnel engineering is the joint action of water and soil. When tunnels have different ways of draining water, how to determine the value of external water pressure has become a common problem in the design of tunnel support structures, and it is also a concern and controversy in the engineering field. one of the hotspots. In the previous design of my country's railway tunnels and highway tunnels, the groundwater prevention and drainage principle of "combining prevention, drainage, interception, and blocking, with drainage as the main focus" was adopted. Therefore, the water pressure acting on the lining is generally not considered, resulting in a large number of The first is that a large amount of groundwater has been ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many viewpoints and achievements at home and abroad on the coupling analysis of tunnel seepage field and stress field, but most of them are based on simplified empirical formulas or numerical simulation calculations, and their engineering applicability is not strong, and it is difficult to reflect The Actual Stress Characteristics of Surrounding Rock and Lining Structure

For the model test, it can be well compared with the actual project, and it is also convenient to compare with other research methods. At present, there is no model test under the joint action of stress field and seepage field at home and abroad, and most of them are considered separately. Therefore, it is difficult to reflect the internal stress and displacement distribution of the tunnel surrounding rock and the stress and deformation characteristics of the support structure under the joint action of the stress field and the seepage field.

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