A large deformation control method for long-span tunnels in chlorite schist formation

A control method and deformation control technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc.

CN107476809BActive Publication Date: 2019-06-11CHANGAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-06-11

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Abstract

A method for deformation control of large-span tunnel in chlorite schist stratum. The method divides the large deformation of large-span tunnel in chlorite schist stratum into five deformation grades according to the surrounding rock conditions of the tunnel. In response to each deformation grade, the deformation control of large-span tunnel is determined so as to ensure the safety and stability of the tunnel support structure and to avoid the clearance intrusion caused by tunnel deformation.
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Description

technical field

[0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a large deformation control method for a long-span tunnel in a chlorite schist formation. Background technique

[0002] Chlorite schist is a kind of regional metamorphic rock with chlorite as the main mineral component. It has a flaky structure, disintegrates when exposed to water and is easy to soften. It is a typical soft rock with low bearing capacity and strong deformation capacity. The relatively complete surrounding rock exposed at the initial stage will also undergo large deformation in a short period of time, making it difficult to stabilize itself. If the integrity of the exposed surrounding rock is poor, direct excavation will not be able to maintain the initial stability of the surrounding rock, and even large-scale landslides will occur during the excavation process, which will bring great difficulties to the tunnel construction. Especially for...

Examples

Embodiment 1

[0062] This embodiment provides a large deformation control method for large-span tunnels in chlorite schist strata. structural plane occurrence and groundwater conditions, etc.), combined with the large deformation magnitude and large deformation control effect under different surrounding rock conditions at the tunnel site, the large deformation grades of long-span tunnels in chlorite schist strata are divided into five grades, And the five large deformation levels from high to low are: extremely severe large deformation, severe large deformation, moderate large deformation, slight large deformation and no large deformation; for each deformation level, determine the corresponding deformation control measures for long-span tunnels , to ensure the safety and stability of the tunnel support structure and avoid tunnel deformation and encroachment.

[0063] Among them, the surrounding rock condition of the tunnel corresponding to the extremely serious deformation is: the surroundi...