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Minimum over-burden originating method for shield tunnel

A technology of shield tunnel and shallow overburden, which is applied to the origin of shield tunnel with shallow overburden, can solve problems such as formation stability, and achieve the effects of reducing project cost, reducing construction risk, and improving social and economic benefits.

Active Publication Date: 2012-11-28
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the stability problem of the strata in the process of starting the shallow covering soil of the existing shield tunnel, and provide a method for starting the shallow covering soil of the shield tunnel without increasing the thickness of the covering soil in the starting section, with low engineering cost and safety

Method used

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  • Minimum over-burden originating method for shield tunnel
  • Minimum over-burden originating method for shield tunnel
  • Minimum over-burden originating method for shield tunnel

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Embodiment Construction

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1~5 As shown in the figure, the shield tunnel shallow covering soil originating method of the present invention comprises the following steps:

[0030] 1) Use rotary jetting piles or stirring piles to reinforce the full-section of the stratum traversed by the shield in the starting section. The thickness of the full-section reinforcement 2 is 2 to 3 meters longer than the length of the shield machine, which is 16.4 meters in this embodiment;

[0031] 2) With the end of the full-section reinforcement 2 as the boundary, along the shield tunneling direction, carry out portal reinforcement to the stratum. The thickness of the portal reinforcement 3 is 55 meters, and the full-section reinforcement 2 and portal reinforcement 3 are reinforced. The ground is covered with back pressure within the scope;

[0032] 3) Then us...

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Abstract

The invention discloses a minimum over-burden originating method for a shield tunnel. The method comprises the following steps of: reinforcing a shield originating section soil body with a method for combining earth covering back pressure, local full-section stratum reinforcing and gantry type stratum reinforcing to improve the stratum stability and the muddy water cleavage resistance of a top soil body; and reinforcing a stratum of a certain thickness on an opening with a freezing method to prevent slurry leakage, stratum instability, emergence of water and mud and the like in a muddy water cabin caused by soil body damage on a face, stratum looseness and the like after opening of a hole door during shield originating. Due to the adoption of the method, the problem of stability of an originating stratum under a minimum over-burden condition is solved, the construction risks of an originating working well and a deep foundation pit at an open excavation section are lowered simultaneously, and construction cost is lowered; and the method has good social and economic benefits.

Description

technical field [0001] The invention relates to a method for starting a shield tunnel, in particular to a method for starting a shield tunnel with shallow overburden soil. Background technique [0002] In recent years, domestic shield tunnels have developed rapidly, including subway, highway, municipal, railway, water, gas and other industries. The domestic industry has also invested a lot of money in the theoretical and experimental research of shield tunneling, and carried out a large number of scientific research topics. For example, some achievements have been made in the structural mechanical properties and design methods of shield tunneling. [0003] However, there are still some problems in shield initiation in super large shield tunnels and under complex environmental conditions. Because the water and soil pressures on the face of the large-diameter shield tunnel are quite different, and the soil conditions on the face are also different. Therefore, it is difficult ...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D9/093E21D11/04
Inventor 肖明清韩向阳刘浩宁茂权薛光桥
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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