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Construction method of shallow tunnel in Xigeda special stratum

A technology for shallow buried tunnels and construction methods, which is applied in the excavation and construction field of shallow buried tunnels, and can solve problems such as increased construction resource investment and construction costs, serious overconsumption of concrete backfill, and rock formation traction damage, etc., to achieve shortened work Time, simple construction and high work efficiency

Active Publication Date: 2018-11-06
中铁十一局集团第五工程有限公司 +1
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Problems solved by technology

Ordinary weak surrounding rock tunnel excavation generally adopts micro (weak) blasting method, the rock formation is seriously damaged by traction, which is not conducive to the stability of the initial support; the over-excavation is large, and the amount of concrete backfill is seriously over-consumed, which greatly increases the investment of construction resources and construction costs
[0003] At present, there is no set of shallow tunnel construction methods dedicated to Xigeda’s special strata to achieve safe, fast, efficient, and low-cost excavation construction

Method used

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  • Construction method of shallow tunnel in Xigeda special stratum
  • Construction method of shallow tunnel in Xigeda special stratum
  • Construction method of shallow tunnel in Xigeda special stratum

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Embodiment Construction

[0034] Below by embodiment and in conjunction with accompanying drawing, the present invention will be further described:

[0035] A construction method for a shallow-buried tunnel in Xigeda special strata, which is carried out according to the following steps:

[0036] Step one, advance geological prediction.

[0037] Before the design of the construction drawing, the design agency will basically conduct a drilling survey on the tunnel engineering geology, but the survey method is basically to conduct a segmented survey on the surface, and the survey results are universal and discontinuous. The geological conditions in front of the subface are abrupt, so it is necessary to strengthen the advance geological prediction of the tunnel and grasp the changes of the surrounding rock of the tunnel in advance. The advanced geological prediction mainly adopts methods such as TSP, deepening the blast hole, advanced drilling, and geological survey, so as to grasp the changes in the surr...

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Abstract

The invention discloses a construction method of a shallow tunnel in a Xigeda special stratum. The construction method of the shallow tunnel in the Xigeda special stratum comprises the following stepsthat 1, advance geological forecast is carried out; 2, an improved small-and-medium-sized excavator is used for bench cut method excavation assisted by manual operation; 3, a small guide pipe and a large pipe shed with built-in bundled bars are adopted to carry out advanced support; 4, the initial support stiffness is increased, water guiding and drainage treatment is carried out, and then concrete wet spraying is carried out; 5, the deformation stability is analyzed through monitoring and measurement, and if disqualification exists, rectifying is carried out until the deformation stability is qualified; and 6, secondary lining is carried out, the safe step distance is strictly controlled, and timely closing is carried out to form a ring. The construction method of the shallow tunnel in the Xigeda special stratum starts from various links such as excavation, initial support, water guiding and drainage, safe, fast, efficient and low-cost tunnel construction is realized, and the construction method of the shallow tunnel in the Xigeda special stratum is especially for construction of the shallow tunnel in the Xigeda special stratum.

Description

technical field [0001] The invention relates to a tunnel body excavation process, in particular to a method applied in Xigeda (N 2 X) Under special stratum conditions, the excavation construction method of the shallow tunnel body. Background technique [0002] The Xigeda formation is a kind of semidiagenetic rock distributed in the southwest of my country, and it is also a kind of extremely soft rock with poor engineering properties. The distribution area of ​​Xigeda formation is 40,000km, mainly composed of gray-green, gray-black, gray-yellow claystone, silty claystone and siltstone. Ordinary weak surrounding rock tunnel excavation generally adopts micro (weak) blasting method, the rock layer is seriously damaged by traction, which is not conducive to the stability of the initial support; the over-excavation is large, and the amount of concrete backfill is seriously over-consumed, which greatly increases the investment of construction resources and construction costs. ...

Claims

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Application Information

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IPC IPC(8): E21D9/04E21D11/14E21F16/02E21D11/10E21D11/18
Inventor 王坤邓仁清王福海李强
Owner 中铁十一局集团第五工程有限公司
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