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Construction method for excavation of double-side-wall pilot tunnel in shallow buried section of small clear distance tunnel

A technology of double side wall guide pit and construction method, which is applied in tunnels, tunnel lining, earthwork drilling and mining, etc., can solve the problems of low excavation stability and poor construction safety, and achieves reduction of surrounding rock disturbance and high construction stability. , the effect of improving the restraint ability

Inactive Publication Date: 2019-09-20
CHINA RAILWAY SEVENTH GRP CO LTD +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional small distance tunnel has low excavation stability and poor construction safety

Method used

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  • Construction method for excavation of double-side-wall pilot tunnel in shallow buried section of small clear distance tunnel
  • Construction method for excavation of double-side-wall pilot tunnel in shallow buried section of small clear distance tunnel

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Experimental program
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specific Embodiment 1

[0068] 1) Modeling and simulation to obtain excavation result models; split units are generated based on these layered models, and each tunnel cross section is divided into three parts: the left and right pilot pits and the main tunnel between the left and right pilot pits. The left pilot pit includes the upper step 1 on the left and the lower step 2 on the left line, the right pilot pit includes the upper step 4 on the right and the lower step 7 on the right line, and the main tunnel includes the upper step 3 on the core soil and the upper middle step on the core soil from top to bottom. Step 5, the lower step 6 in the core soil and the lower step 8 in the core soil.

[0069] 2) Build a large pipe shed, and grout to reinforce the ground; use the step method to excavate the soil body of a step on the left line, make locking foot anchor pipes and initial support, and seal the tunnel face in time.

[0070] 3) After 6 meters of the first step on the left line is completed, use th...

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Abstract

The invention discloses a construction method for excavation of a double-side-wall pilot tunnel in a shallow buried section of a small clear distance tunnel. The construction method comprises the following steps that (1) modeling and simulation are performed; (2) construction preparation is performed; (3) tunnel construction is performed, specifically, a left line upper step is excavated, and temporary support and primary support are performed; a left line lower step is excavated, and temporary support and primary support are performed; a core soil upper step is excavated, and temporary support and primary support are performed; a right line upper step is excavated, and temporary support and primary support are performed; a core soil middle upper step is excavated, and temporary support and primary support are performed; a core soil middle lower step is excavated, and temporary support and primary support are performed; a right line lower step is excavated, and temporary support and primary support are performed; and a core soil lower step is excavated, and temporary support and primary support are performed. The construction method has good stability and high safety.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering construction. More specifically, the invention relates to a construction method for excavating a double-side-wall pilot pit in a shallow buried section of a tunnel with a small clear distance. Background technique [0002] With the rapid development of high-grade highway construction, more and more tunnels appear in the highway. The uplink and downlink tunnels are often restricted by the terrain when selecting the highway route in mountainous areas. The traditional tunnel structure is multi-arch tunnel. However, the engineering cost and construction period of multi-arch tunnels are relatively high. For this reason, in the engineering practice, the tunnel construction technology of the short-distance and low-cost small clear distance tunnel has been newly developed. The width of the interlayer rock pillars in the double tunnels of the small clearance tunnel is between the double-arch t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/00E21D11/10
CPCE21D9/00E21D11/003E21D11/10
Inventor 晏红王迎军易中平李长白徐宁杨维卢军樊小宾刘志华贾骏涛黄克双李政申鑫屠宝春李准
Owner CHINA RAILWAY SEVENTH GRP CO LTD
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