Shallow-buried bias tunnel operation period surrounding rock and lining structure overall stability evaluation method

Abstract

The invention relates to a shallow-buried bias tunnel operation period surrounding rock and lining structure overall stability evaluation method, and belongs to the technical field of tunnel monitoring. Aiming at the operation safety problem a tunnel, a shallow-buried bias tunnel operation period overall stability analysis and evaluation method based on numerical limit analysis is provided, and the method comprises the steps of: obtaining a surrounding rock mass damage judgment standard (limit strain value) through equivalent rock numerical test analysis; then obtaining a damage judgment standard (limit strain value) of the concrete material through literature research and theoretical analysis; and finally, establishing a tunnel simulation analysis model. Under the condition that lining force structural parameters are kept unchanged, the lining force is reduced, the strength parameters of the surrounding rock are continuously reduced, the stable state and instability failure mode of the surrounding rock are analyzed through the limit strain of the surrounding rock, the structure safety state, vulnerable key parts, damage characteristics and instability failure mechanism are analyzed through the limit strain distribution rule of lining concrete, and then an overall stability evaluation method system is formed.

Description

technical field [0001] The invention belongs to the technical field of tunnel monitoring and relates to a method for evaluating the overall stability of surrounding rock and lining structures of shallow-buried bias-pressure tunnels during operation. Background technique [0002] With a large number of expressway tunnels put into operation, the operational safety of the tunnel has received extensive attention. The operational safety of the tunnel includes two aspects: driving and traffic safety, as well as surrounding rock and structural safety. Due to the high risk of operating safety in shallow buried and biased formations, it is currently stable. The safety evaluation methods are often aimed at the safety evaluation of the structure itself, without comprehensively considering the geological conditions of the surrounding rock. The evaluation methods mostly use the analytic hierarchy process to establish the structural safety level evaluation index system and classification s...

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Problems solved by technology

[0002] With a large number of expressway tunnels put into operation, the operational safety of the tunnel has received extensive attention. The operational safety of the tunnel includes two aspects: driving and traffic safety, as well as surrounding rock and structural safety. Due to the high risk of operating safety in shallow buried and biased formations, it is currently stable. The safety evaluation methods are often aimed at the safety evaluation of the structure itself, without comprehensively considering the geological conditions of the surrounding rock. The evaluation methods mostly use the analytic hierarchy process to establish the structural safety level evaluation index system and classification standards, and do not quantitatively evaluate the surrounding rock and support from the perspective of mechanics. The overall stability of the structure, the evaluation methods and standards are not clear enough

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