Comprehensive evaluation method for shield tunnel construction risk

Abstract

The invention provides a comprehensive evaluation method for a shield tunnel construction risk, and overcomes the defect that a traditional evaluation method can not associate the fuzziness and the randomness of risk evaluation. The evaluation method comprises the following steps that: constructing an index system used for shield tunnel construction risk evaluation; determining a construction riskcomprehensive evaluation level standard, a cloud model system and a cloud atlas, wherein the cloud model system and the cloud atlas correspond to the construction risk comprehensive evaluation levelstandard; determining index weight, a security state evaluation index system and a corresponding cloud model system; evaluating the weight cloud model of each index and the security state evaluation cloud model of each bottom-layer sub-index so as to calculate the construction risk comprehensive evaluation cloud model of each bottom-layer sub-index; transferring the result to each upper-layer index step by step to obtain the construction risk comprehensive evaluation cloud model of any index or shield tunnel; and converting the cloud model into the cloud atlas, and comparing with the cloud atlas corresponding to the above construction risk comprehensive evaluation level standard to obtain a corresponding construction risk comprehensive evaluation level.

Description

technical field [0001] The invention relates to the technical field of shield tunnel risk assessment, in particular to a comprehensive risk assessment method for shield tunnel construction. Background technique [0002] As the main construction method of urban rail transit, the shield method accounts for 50% to 70% of the total construction length of urban rail lines. Because the shield tunnel shuttles through the complex urban strata, its construction technology is difficult, the construction quality requirements are high, and the construction risk is high, and there are important structures and dense crowds around it, which brings many uncertain risk factors to the shield tunnel construction. In view of these uncertain risk factors, it has become an extremely important research content in the safety risk management of tunnel construction to determine the risk level of tunnel construction through efficient, accurate and practical methods to ensure safe construction of tunne...

AI Technical Summary

Problems solved by technology

[0007] For this reason, the present invention provides a comprehensive evaluation method for shield tunnel construction risk based on cloud theory, which takes the construction process of shield tunnel as a fuzzy system, decomposes the risk factors of each construction process step by step, and constructs the construction risk of shield tunnel The evaluation index system proposes a new visualization method for the comprehensive risk assessment model of shield tunnel construction based on cloud theory, which overcomes the defect that traditional risk assessment methods cannot associate the ambiguity and randomness of risk assessment together

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