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Method for excavating mountain tunnels in weak surrounding rock-fractured zones or shallow covered slope sections

A technology of weak surrounding rock and broken zone, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of slow construction speed, high cost, narrow working space, etc., and achieve fast construction progress, low project cost, and construction safety. good effect

Inactive Publication Date: 2012-09-19
CHINA CONSTR SIXTH ENG DIV CORP
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  • Description
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Problems solved by technology

However, the working space of this method is narrow, the construction speed is slow, and the cost is high.

Method used

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  • Method for excavating mountain tunnels in weak surrounding rock-fractured zones or shallow covered slope sections
  • Method for excavating mountain tunnels in weak surrounding rock-fractured zones or shallow covered slope sections
  • Method for excavating mountain tunnels in weak surrounding rock-fractured zones or shallow covered slope sections

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Embodiment Construction

[0032] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0033] see Figure 1 to Figure 4 , an excavation method for a weak surrounding rock fracture zone and a shallow buried biased section of a mountain tunnel, comprising the following steps:

[0034] 1) Arch set and advance support, including the following steps:

[0035] 1) Excavation and formation of the uphill slope at the mountain side of the cave entrance: After the position of the tunnel entrance is determined, the open excavation forming operation platform makes the tunnel dark cave entrance appear;

[0036] 2) Arch construction:

[0037] When the excavation of earth and stone at the entrance of the open tunnel reaches the junction of the open and dark tunnels, the excavation of earth and stone will be suspended, and the position of the...

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Abstract

The invention discloses a method for excavating mountain tunnels in weak surrounding rock-fractured zones or shallow covered slope sections, which includes the following steps: (1) cover arch and forepoling; (2) tunnel cutting, including the following steps: (a) the annular part of the upper cross section of the portal of the buried tunnel is first cut, a core soil part is formed on the upper cross section, and an arch is formed; (b) combined bolting and shotcrete is carried out on the arch; (c) the core soil part is cut; (d) the lower cross section of the portal of the buried tunnel is cut; (e) first shotcrete and combined bolting and shotcrete are carried out on the left and the right sidewalls; (f) an inverted arch is lined and backfilled; (g) secondary lining is carried out; (3) step 2 is repeated until the leading pipe shed construction of the next tunnel section is carried out; (4) step 3 is repeated until the tunnel runs through the weak surrounding rock-fractured zone of a mountain. The construction space is large, multi-working face parallel operation can be carried out, and the working efficiency is high; and since the core soil is reserved on the upper cross section and the left and the right cross sections on the lower cross section are staggerly cut forward, the cut working face can be kept stable.

Description

technical field [0001] The invention relates to the technical field of mountain tunnel construction, in particular to an excavation method for a weak surrounding rock fracture zone and a shallow buried biased section of a mountain tunnel. Background technique [0002] In recent years, the construction of tunnel projects has increased day by day, and its excavation methods have been paid more and more attention by people. In the construction process of the weak surrounding rock fracture zone and the shallow buried biased section of the mountain tunnel, the side wall pilot pit method is often used for excavation construction. The side wall pilot pit method has a small excavation surface, little disturbance to the surrounding rock, short tunnel exposure time, and safe construction. However, this method has narrow working space, slow construction speed and high cost. Contents of the invention [0003] In order to solve the technical problems in the known technology, the pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/10
Inventor 白俊涛任富芝徐利魏家富巩汉波
Owner CHINA CONSTR SIXTH ENG DIV CORP
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