Method for reasonably earthing and setting cross river-sea shield tunnel

A technology for shield tunneling and setting methods, which is applied to tunnels, earthwork drilling, mining equipment, etc., and can solve the problems of increasing project cost and construction difficulty

Active Publication Date: 2018-09-25
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the existing technology, measures such as reinforcement or increasing the thickness of the covering soil are generally adopted for the special small covering soil section, and measure

Method used

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  • Method for reasonably earthing and setting cross river-sea shield tunnel
  • Method for reasonably earthing and setting cross river-sea shield tunnel
  • Method for reasonably earthing and setting cross river-sea shield tunnel

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Embodiment 1

[0089] The embodiment of the present invention provides a safe and economical method for setting reasonable covering soil of shield tunnels across rivers and seas, which is suitable for small covering soil intervals with high excavation risks; The calculation method of the limit value of mud-water pressure to ensure the safety of excavation under the thickness of the covering soil can obtain the reasonable thickness of the covering soil within the fluctuation range of the mud-water pressure.

[0090] The schematic diagram of engineering geological conditions preset by a method for setting reasonable overburden of shield tunnels across rivers and seas based on excavation safety provided by the embodiment of the present invention is as follows figure 1 As shown, the specific contents of engineering geology include: river, seawater 1, tunnel covering soil (clay) layer 2, shield tunnel 3 and shield tunneling surface 4.

[0091] A schematic diagram of a method for setting reasonabl...

Embodiment 2

[0152] This embodiment provides a method for setting reasonable overburden of shield tunnels across rivers and seas based on excavation safety, and its specific implementation may include the following steps:

[0153] Step 1: According to the design and construction plan of the cross-river-sea shield tunnel, determine the shield diameter D = 15m, and the distance h from the water surface to the top surface of the tunnel covering soil w =9m.

[0154] Obtain soil samples from the overlying layer of the tunnel along the tunnel, carry out gravity tests, internal friction angle and cohesion tests on the soil samples, and determine the gravity of the soil at the construction site γ = 18.7kN / m 3 , effective weight γ'=17.7kN / m 3 , internal friction angle Cohesion c = 30.0 kPa.

[0155] The gravity of the river and sea water in the construction area is measured γ w =10.0kN / m 3 ; Take the muddy water used in shield tunneling to measure the gravity of shield muddy water γ f =11.0k...

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Abstract

The embodiment of the invention provides a method for reasonably earthing and setting a cross river-sea shield tunnel. The method comprises the following steps: acquiring tunnel design and a construction parameter and determining physical and mechanical parameters of an earthing layer and a water layer on the tunnel; calculating a muddy water support pressure upper limit value capable of guaranteeing shield tunneling safety under different earthing thicknesses; calculating a muddy water support pressure lower limit value capable of guaranteeing shield tunneling safety under different earthingthicknesses; calculating a shield muddy water support pressure allowable difference value capable of guaranteeing tunneling safety under different earthing thicknesses; determining the maximal fluctuation range of shield muddy water support pressure in the tunneling process; enabling the maximal fluctuation range of the shield muddy water support pressure to be equal to the shield muddy water support pressure allowable difference value under a certain earthing thickness to acquire the minimal earthing thickness and considering safety coefficient to acquire earthing thickness. According to themethod, the rationality of the earthing thickness of the cross river-sea shield tunnel is guaranteed, and cleavage and instable failure of the tunneling face of the cross river-sea shield tunnel are avoided.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a method for setting reasonable covering soil of shield tunnels across rivers and seas based on excavation safety. Background technique [0002] With the development of traffic in coastal cities along the river, in order to alleviate the pressure of urban traffic, it has become a trend to build large-section tunnels across rivers and seas. Soft soil tunnels across rivers and seas are often constructed using mud-water balance shields. Due to the constraints of line alignment, stratum conditions and project cost, it is generally required that the covering soil thickness should be as thin as possible, which is called the small covering soil interval. During the construction of shield tunnels in small soil-covered sections, shield excavation is faced with many challenges such as high water pressure, interaction between soft and hard strata, changeable underwater topograp...

Claims

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Application Information

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IPC IPC(8): G06F17/50E21D9/06
CPCE21D9/06G06F30/13
Inventor 袁大军王将李兴高沈翔金大龙吴俊王小宇许亚楼
Owner BEIJING JIAOTONG UNIV
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