Excavation face seepage test system of river bottom shield tunnel construction under tidal load effect

A technology of shield tunneling and test system, which is applied in the fields of permeability/surface area analysis, measuring device, suspension and porous material analysis, etc., and can solve the problems of great impact on the stability of the excavation surface, changes and deformation of the confined water in the permeable formation Damage and other problems, to achieve the effect of guiding design and construction, optimizing construction parameters

Active Publication Date: 2019-04-16
ZHEJIANG UNIV
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Problems solved by technology

The river bottom tunnel in the tidal area constructed by the shield method, due to the tidal load, the confined water of the permeable stratum changes frequently, so the tidal load has a great influence on the stability of the excavation surface during the construction of the river bottom shield tunnel, which is easy to cause shielding. Excessive seepage at the excavation surface of the structural tunnel or even deformation and failure

Method used

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  • Excavation face seepage test system of river bottom shield tunnel construction under tidal load effect
  • Excavation face seepage test system of river bottom shield tunnel construction under tidal load effect
  • Excavation face seepage test system of river bottom shield tunnel construction under tidal load effect

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Embodiment 1

[0027] Construction sequence: The first step is to prepare cement mortar with a certain mix ratio, and complete the production of the semi-circular concrete lining 15 through the steps of pouring, curing, demoulding, and installation;

[0028] The second step is to install the earth-retaining glass plate 9, the water-permeable earth-retaining steel plate 10, the telescopic rod mounting seat 12 and the measuring cylinder 24 in the corresponding position in the model box 1, and apply petroleum jelly to the inner wall of the model box 1 to avoid between the soil and the model box Border effects caused by friction. The diameter of the water filter holes of the permeable soil retaining steel plate 10 needs to be smaller than the median diameter of the soil sample particles of the permeable soil layer, so as to avoid the formation loss caused by the large amount of soil particles of the permeable soil layer entering the water sample. Permeable retaining steel plate 10 as attached Figu...

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Abstract

The invention provides an excavation face seepage test system of river bottom shield tunnel construction under a tidal load effect. The system comprises a model box and a shield tunnel model. The mainbody of the shield tunnel model is placed in the model box. Soil and water samples are filled in the model box in a layered mode. A movable panel, a telescopic straight rod and a telescopic rod installation seat form a tunnel excavation face support device. A frequency conversion water pump device can be used to simulate a tidal load above a river bottom shield tunnel in a tidal bore zone. Through setting tidal load condition combinations with different amplitudes and different frequencies, excavation face seepage discharge changes, the change of the seepage field of soil near an excavation face, the displacement change of the soil sample at each test point, and the change of the support pressure of each test point are monitored so as to study an excavation face seepage law, then optimizea shield construction parameter and guide a design and construction.

Description

Technical field [0001] The invention belongs to the field of shield tunnel excavation surface seepage test systems, and particularly relates to an excavation surface seepage test system for river bottom shield tunnel construction under tidal loads. Background technique [0002] The shield method has the advantages of fast construction speed and little impact on ground traffic. It has been widely used in subway tunnel excavation projects at home and abroad, especially for the construction of cross-river tunnels. The shield method has unique advantages. For tunnels under the river in the tidal zone constructed by the shield method, the confined water in the permeable strata changes frequently due to tidal loads. Therefore, the tidal load has a greater impact on the stability of the excavation surface during the construction of the shield tunnel on the river, and it is easy to cause shields. Excessive seepage flow of the tunnel excavation surface may even deform and damage. This is...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 曹志刚范昌杰蔡袁强
Owner ZHEJIANG UNIV
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