Collapsible loess tunnel construction method

A technology for collapsible loess and tunnel construction, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of upper road surface subsidence, soil damage, subsidence, etc., and achieve the effect of ensuring safety and stability

Active Publication Date: 2012-07-25
XIAN UNIV OF TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

However, when the collapsible loess is soaked in water, under the action of its own weight or a certain load, the structure of the soil is rapidly destroyed and significant additional subsidence occurs, so that the road surface on it subsides and the buildings on it are damaged.

Method used

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  • Collapsible loess tunnel construction method
  • Collapsible loess tunnel construction method
  • Collapsible loess tunnel construction method

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Embodiment Construction

[0021] Collapsible loess tunnel construction method of the present invention, carry out according to the following steps:

[0022] Step 1. Before excavating the tunnel, first set up a water-resisting layer 2 at a certain distance below the road surface 1 directly above the tunnel, and lay a sandstone layer 3 between the road surface 1 and the water-resisting layer 2 .

[0023] Such as figure 1 As shown, the water-resistant layer 2 is formed by ramming plain soil, the distance between the bottom of the water-resistant layer 2 and the road surface 1 is 1m-1.2m, and the thickness of the water-resistant layer 2 is 27cm-33cm. The gravel layer 3 is made of sand, gravel or coarse sand, and the thickness of the gravel layer 3 is 27cm-33cm.

[0024] Step 2. Excavate the tunnel using the double pilot tunnel method. First, excavate the side pilot tunnels 4 on the left and right sides of the tunnel. Temporary steel arch supports 5 are respectively installed in the two side pilot tunnels ...

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Abstract

The invention discloses a collapsible loess tunnel construction method. Before tunneling, a waterproof layer and a sandstone layer are arranged below a road surface right above a tunnel; the tunnel is excavated by a double guide tunnel method, side guide tunnels on the left and the right of the tunnel are firstly excavated, and temporary steel arch supports are constructed; concrete piles are respectively arranged in a lower soil layer along the bottoms of the two side guide tunnels, and the bottoms of the concrete piles penetrate into a non-collapsible soil layer; emulsified asphalt is filled into the soil layer between the two adjacent concrete piles, and a seepage isolation barrier is formed; an initial arch wall liner is formed; soil between the two side guide tunnels is excavated by a benching tunneling construction method, and a middle tunnel is formed; and the two temporary supports are detached, and a secondary tunnel liner is cast. By the aid of the collapsible loess tunnel construction method, an overlying stratum on the collapsible loess tunnel can be prevented from collapsible settlement, and the tunnel liner is safe and stable.

Description

technical field [0001] The invention belongs to the technical field of underground structures of buildings, and in particular relates to a construction method for collapsible loess tunnels. Background technique [0002] The pore ratio of collapsible loess is generally about 1.0 or greater, but due to the strong connection between particles, it can bear a certain load in natural dry conditions, with high bearing capacity and small deformation . However, when the collapsible loess is soaked in water, under the action of its own weight or a certain load, the structure of the soil is rapidly destroyed and significant additional subsidence occurs, so that the road surface on it subsides and the buildings on it are damaged. For tunnels in collapsible loess areas, on the one hand, due to the existence of tunnel lining, a water-resisting layer is formed within the width of the tunnel to prevent the vertical infiltration movement of the overlying stratum from the surface of the wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/38E21D11/10
Inventor 邵生俊陆斯徐宁飞焦阳阳
Owner XIAN UNIV OF TECH
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