Ground stress release method for high ground stress soft rock tunnel positive step excavation

A technology of tunnel excavation and high ground stress, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of limited deformation control ability, large deformation, unreasonable drilling position design, etc., and achieve the effect of controlling the deformation of surrounding rock.

Inactive Publication Date: 2011-08-17
CHINA RAILWAY TUNNEL GROUP CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

These measures are not only wasteful of materials and poor in economy, but also have limited deformation control capabilities. Large deformations will still occur when the strength of the local stress is greater than the strength of the support system.
[0004] In previous constructions, there were also a few projects that used the advanced drilling method to control the deformation of high geostress soft rock tunnels. Advanced drilling method, large number of drilling holes, low stress release efficiency, low construction efficiency, and difficult to form productivity

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  • Ground stress release method for high ground stress soft rock tunnel positive step excavation
  • Ground stress release method for high ground stress soft rock tunnel positive step excavation
  • Ground stress release method for high ground stress soft rock tunnel positive step excavation

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Embodiment Construction

[0018] The present invention will be described with reference to the accompanying drawings and specific embodiments:

[0019] like figure 1 , figure 2 As shown in the figure, an in-situ stress release method for excavation of a high-in-situ stress soft rock tunnel by the positive step method, after the tunnel construction forms an upper step 1, several boreholes 3 are drilled in the direction of the tunnel excavation to make the in-situ stress Acting on these boreholes, the borehole consumes the energy of in-situ stress in the process of deformation, and releases the in-situ stress. The specific steps are as follows:

[0020] a. First excavate the upper part of the excavation surface to form the upper step 1, and then level the upper step 1 to provide a suitable working platform 5 for the drilling rig;

[0021] b. Carry out the steps of vertical arching, drilling bolts, and initial support of shotcrete on the upper step 1 to ensure the safety of the tunnel during drilling; ...

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Abstract

The invention relates to high ground stress soft rock tunnel stress release technology and provides a ground stress release method for a high ground stress soft rock tunnel positive step excavation; the method comprises the following steps of: excavating at the upper part of a tunnel to form an upper step (1), then drilling a plurality of boreholes (3) on a working face (4) of the upper step along the direction of tunnel excavation so that the ground stress acts on the boreholes, consumes the energy of the ground stress in a deformation process and releases the ground force. The method achieves the purpose of effectively controlling the deformation of ground stress rock tunnel surrounding rocks and provides security guarantee for subsequent tunnel excavation.

Description

technical field [0001] The invention belongs to the stress release technology of high in-situ stress soft rock tunnels, and mainly proposes an in-situ stress release method used for excavation of high in-situ stress soft rock tunnels by positive step method. Background technique [0002] The high in-situ stress soft rock tunnel constructed by the positive step method is prone to large deformation during the construction process, resulting in tunnel boundary encroachment and even tunnel collapse. The positive step method is one of the tunnel construction methods. During the construction, the entire tunnel section is divided into several layers, and the excavation is carried out from top to bottom. The front and rear of each layer of the excavation face maintain a certain distance to form several positive steps. The positive steps are named upper steps and lower steps respectively according to their upper and lower positions. In-situ stress refers to the spatial distribution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D9/10
Inventor 洪开荣李建伟张文强邹翀张文新高攀李治国蒋永强唐绍武
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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