Method for reducing external water pressure of deep-buried cross-sea shield segment of sandy soil stratum

A shield segment and water pressure technology, which is applied in the direction of earth drilling, drainage, underground chambers, etc., to achieve the effect of enhancing the arch effect of the soil, increasing the strength, and increasing the clearance of the tunnel

Active Publication Date: 2020-04-17
HOHAI UNIV
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Problems solved by technology

[0004] The present invention proposes a method for reducing the external water pressure of a deep-buried cross-sea shield segment in sandy soil, and its purpose is to solve the problem of super-thick segment design caused by high water pressure in the construction of a large number of deep-buried cross-sea tunnels in the future. problems, reducing tunnel construction costs

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  • Method for reducing external water pressure of deep-buried cross-sea shield segment of sandy soil stratum
  • Method for reducing external water pressure of deep-buried cross-sea shield segment of sandy soil stratum
  • Method for reducing external water pressure of deep-buried cross-sea shield segment of sandy soil stratum

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Embodiment 1

[0035] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] The construction of the Qiongzhou Strait Tunnel faces many world-class problems and challenges: 1) The water pressure is above 2000kPa; 2) The diameter of the shield is more than 17m, which is unprecedented in the world; 3) The 300-meter-thick sand layer contains pebbles and gravel; 4) The tunnel is 27.6 kilometers long.

[0037] Since the current tunnel construction plan has not yet been determined, according to relevant data, the outer diameter of the segment ring is 16.7m, and the submarine stratum is mainly composed of silty fine sand, silty clay and clay.

[0038] According to the modified customary method, the hoop axial force of the tunnel segment ring is obtained as figure 1 shown. According to the estimation of the design institute, under the action of 200m high water head pressure, the maximum hoop axial for...

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Abstract

The invention discloses a method for reducing the external water pressure of a deep-buried cross-sea shield segment of a sandy soil stratum. The method for reducing the external water pressure of thedeep-buried cross-sea shield segment of the sandy soil stratum comprises the steps that first, after the shield segment is assembled, soil bodies within a certain range of the outer periphery of a segment ring are subjected to grouting reinforcement, so that the strength of a sand soil layer is improved, and the permeability is reduced; secondly, a plurality of pressure-limiting drainage valves are arranged on the segment ring by every a plurality of distances in the longitudinal direction of a tunnel; and finally, monitoring is strengthened to ensure that the water pressure of the outer periphery of the segment ring does not exceed a design value. The method for reducing the external water pressure of the deep-buried cross-sea shield segment of the sandy soil stratum is beneficial for reducing the water pressure acting on the segment, the thickness of the segment ring is reduced, the effective utilization rate of the tunnel section is improved, and the cost of the tunnel is greatly saved.

Description

technical field [0001] The invention relates to a method for reducing the external water pressure of a deep-buried cross-sea shield segment in a sandy soil layer, and belongs to the technical field of underground engineering construction. Background technique [0002] With the strong and rapid development of my country's infrastructure technology, it is possible to build more tunnels to open up the Bohai Bay Strait, Taiwan Strait and Qiongzhou Strait in the future. To open up intercontinental connections through high-speed rail in the future, it is necessary to build more and deeper cross-sea tunnels, such as the Bering Strait subsea tunnel between Asia and North America. Considering factors such as the depth of seawater and the stability of the tunnels, these tunnels may withstand water pressures as high as 2000-3000kPa. According to the current segment design method, the thickness of these tunnel segments needs to reach more than 2m, which will greatly occupy the tunnel c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/08E21D11/10E21F16/02E21F17/18G06F30/20
CPCE21D9/001E21D11/08E21D11/10E21F16/02E21F17/18
Inventor 钟小春丰土根于伦超孙金鑫张洋游智王群汪浩
Owner HOHAI UNIV
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