Method for determining best time to construct secondary lining of soft broken surrounding rock tunnel

A technology of crushing surrounding rock and judging method, applied in tunnel lining, tunnel, wellbore lining, etc., can solve problems such as difficult operation and complexity, and achieve the effect of comprehensive judgment method, comprehensive consideration and strong operability

Inactive Publication Date: 2014-09-17
TONGJI UNIV
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However, the methods of reasonable support timing for the secondary

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  • Method for determining best time to construct secondary lining of soft broken surrounding rock tunnel

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0035] like figure 1 As shown, a method for judging the best timing of the secondary lining construction of tunnels with weak and broken surrounding rock, through the on-site monitoring and measurement of the settlement of the vault and the deformation convergence of the side wall of the surrounding rock-primary support system, using the surrounding rock-primary support system Based on the measured deformation data, the rate ratio method of the deformation of the surrounding rock-primary support system and the five-level rate ratio method considering whether the support is conservativ...

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Abstract

The invention relates to a method for determining the best time to construct the secondary lining of a soft broken surrounding rock tunnel. The method comprises the following steps: S1, making a determining basis for the best time to construct the secondary lining of the soft broken surrounding rock tunnel; S2, adopting a tacheometry to monitor the vault crown settlement and side wall deformation convergence of a surrounding rock-primary supporting system of the soft broken surrounding rock tunnel on site; S3, determining in a deformation rate ratio method of the surrounding rock-primary supporting system of the soft broken surrounding rock tunnel; S4, determining whether the supporting is conservative or not by a five-stage rate ratio method of the surrounding rock-primary timbering system. Compared with the prior art, the method has the advantages that the operation is simple, the applicability is wide and the like.

Description

technical field [0001] The invention relates to a method for constructing the secondary lining of a tunnel, in particular to a method for judging the best timing for constructing the secondary lining of a tunnel with weak and broken surrounding rock. Background technique [0002] When the tunnel is excavated, move forward along the face of the tunnel, and then the four sides of the tunnel that has been dug need to be reinforced. "Second lining" refers to the work that still needs to be reinforced for the second time around the reinforced tunnel. At home and abroad, some relevant research has been carried out on the optimal timing of tunnel secondary lining construction. Combined with the formula, the rheological parameters of the surrounding rock are determined; combined with the criteria for determining the second lining support time of the tunnel in the code, the optimal timing of the secondary lining support of the tunnel in various levels of surrounding rock is determin...

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Application Information

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IPC IPC(8): E21D11/00
Inventor 许建聪周泉吉
Owner TONGJI UNIV
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