A seepage test system for excavation face under tidal load in river bottom shield tunnel construction

A technology of shield tunneling and test system, which is applied in permeability/surface area analysis, suspension and porous material analysis, instruments, etc. Excessive seepage flow on the excavation surface of the tunnel, etc., to optimize the construction parameters and achieve the effect of guiding the design and construction

Active Publication Date: 2020-09-04
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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  • A seepage test system for excavation face under tidal load in river bottom shield tunnel construction
  • A seepage test system for excavation face under tidal load in river bottom shield tunnel construction
  • A seepage test system for excavation face under tidal load in river bottom shield tunnel construction

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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 semi-circular concrete lining 15 through steps such as pouring, curing, formwork removal, and installation;

[0028] In the second step, install the soil-retaining glass plate 9, the water-permeable soil-retaining steel plate 10, the expansion rod mounting seat 12 and the measuring cylinder 24 at the corresponding positions in the model box 1, and apply vaseline on the inner wall of the model box 1 to avoid the gap between the soil and the model box. Boundary effects caused by friction. The diameter of the filter hole of the permeable soil retaining steel plate 10 needs to be smaller than the median particle size of the soil sample particles in the permeable soil layer, so as to avoid formation loss caused by a large amount of soil particles in the permeable soil layer entering the water sample. Permeable soil retaining steel plate 10 as attached ...

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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 excavation surface seepage test systems of shield tunnels, in particular to an excavation surface seepage test system for river bottom shield tunnel construction under the action of tidal loads. Background technique [0002] The shield tunneling 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 tunneling method has unique advantages. The river bottom tunnel in the tidal area constructed by the shield method, due to the tidal load, the confined water in 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 face of the structural tunnel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 曹志刚范昌杰蔡袁强
Owner ZHEJIANG UNIV
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