Method for designing tunnel composite lining based on total safety factor process

Abstract

The invention relates to a method for designing a tunnel composite lining based on a total safety factor process. The method comprises the following steps: confirming a surrounding rock pressure representative value of the composite lining; confirming a total safety factor of the composite lining according to the support type; primarily distributing the confirmed total safety factor of the composite lining, thereby acquiring respective safety factors of spraying layer, anchor rod-surrounding rock bearing arch and secondary lining; confirming parameters of spraying layer, anchor rod-surroundingrock bearing arch and secondary lining according to a distribution result of each safety factor and a corresponding load structure model; acquiring a load proportional coefficient of composite structure in general damage stage by adopting a composite structure model according to the parameters of spraying layer, anchor rod-surrounding rock bearing arch and secondary lining; acquiring strength matching degree of support components by comparing the relationship between the load proportional coefficient and the sum of the safety factors of spraying layer and secondary lining; comprehensively analyzing and selecting an optimal supporting scheme according to multiple sets of supporting parameters confirmed on the basis of multiple sets of distribution results of total safety factor and throughcomparison and selection of strength matching degree, economic efficiency and practicability.

Description

technical field [0001] The invention belongs to the field of tunnel engineering, and in particular relates to a tunnel composite lining design method based on a total safety factor method. Background technique [0002] Composite lining is composed of system anchor rod or anchor cable, shotcrete, steel arch, waterproof layer and molded concrete. It is a support form widely used in mining, hydraulic caverns and traffic tunnels. In the past, composite lining The design of the lining mainly relies on engineering analogy and empirical values, and quantitative design cannot be achieved, which will adversely affect the safety and economy of the project. Contents of the invention [0003] The purpose of the present invention is to solve the defects of the prior art, to provide a design method for the composite lining of tunnels, which divides the composite lining support components into anchor rods-surrounding rock bearing arches, shotcrete layers (including shotcrete, steel mesh ...

AI Technical Summary

Problems solved by technology

[0002] Composite lining is composed of system anchor rod or anchor cable, shotcrete, steel arch, waterproof layer and molded concrete. It is a support form widely used in mining, hydraulic caverns and traffic tunnels. In the past, composite lining The design of the lining mainly relies on engineering analogy and empirical values, and quantitative design cannot be achieved, which will adversely affect the safety and economy of the project

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