Excavation construction method for super large cross section tunnel of bias shallow buried weak surrounding rock

A technology with weak surrounding rock and super large cross-section, applied in tunnels, earthwork drilling, mining equipment, etc., can solve problems such as slow progress, increased project investment costs, and impact on tunnel penetration time, etc., achieving simple steps, good fixing effects, and improved The effect of profitability

Inactive Publication Date: 2017-07-25
CCCC SECOND HARBOR ENG
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Problems solved by technology

However, when encountering a super-large-section tunnel with bias pressure, shallow burial, and weak surrounding rock, due to the large section of the tunnel, when the CD method and CRD method are used for the overall section construction, the progress is slow, which seriously affects the tunnel penetration time and improves the construction efficiency of the tunnel. Project input cost

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  • Excavation construction method for super large cross section tunnel of bias shallow buried weak surrounding rock
  • Excavation construction method for super large cross section tunnel of bias shallow buried weak surrounding rock
  • Excavation construction method for super large cross section tunnel of bias shallow buried weak surrounding rock

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 Shown in -3, the excavation construction method of the super-large section of the biased shallow buried soft surrounding rock comprises the following steps:

[0025] 1), using the CRD method for the initial excavation of the tunnel, and setting up a temporary partition wall 1;

[0026] 2) With the temporary partition wall 1 as the boundary, divide the face of the tunnel construction into left and right sides, and divide the left and right sides of the face into three excavation parts, upper, middle, lower, and excavation at the bottom of the tunnel, respectively. Part 11;

[0027] 3) After the advance support of the arch is applied, the upper excavation on the left and right sides of the tunnel face is excavated at the same time, the upper core soil 3 is reserved, and the middle excavation on the left and rig...

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Abstract

The invention discloses an excavation construction method for a super large cross section tunnel of bias shallow buried weak surrounding rock. A temporary median lamella wall is adopted to divide a tunnel face into a left part and a right part; and the left part and the right part are excavated simultaneously through a three-bench-five-step method. According to the three-bench-five-step excavation method of the median lamella, when the geological condition changes, construction processes can be converted flexible and timely, the construction method is adjusted, and the construction period is shortened. The excavation method is simple in process and reliable in excavation, excavation of the super large cross section tunnel of the bias shallow buried weak surrounding rock is provided an important guarantee, the failure rate is low, and the project profitability is enhanced. A locking anchor pipe replaces a traditional locking anchor rod, the stability of the structure is also improved, meanwhile, steel pipes are adopted to fix steel frames, so that the steel frames form a whole through the connected steel pipes, the system bearing load is improved, the fixing effect of the steel frames is better, and control of tunnel deformation is very favorable.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to an excavation construction method for a super-large cross-section with biased shallow buried soft surrounding rock. Background technique [0002] With the extension of highway construction in the western region to mountainous areas, the requirements for road comfort have increased, and the construction of a large number of highway tunnels has become an inevitable trend. When encountering tunnels with poor surrounding rock geological conditions, construction methods such as CD method and CRD method are generally adopted. The CD method and the CRD method are more beneficial to the overall section construction of the surrounding rock, especially the control of the settlement of the vault is more reasonable. However, when encountering a super-large-section tunnel with bias pressure, shallow burial, and weak surrounding rock, due to the large section of the tunnel, when t...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D9/14E21D15/50E21D21/00
Inventor 肖伯强黄成伟胡义新徐庭周舒李志成李送根王璐
Owner CCCC SECOND HARBOR ENG
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