A method for evaluating the structural health status of a shield tunnel in soft soil

Abstract

A method for evaluating the structural health status of a shield tunnel in soft soil is provided. Combined with the possibility theory, the complex and changeable mapping relationship between monitoring data and shield tunnel structure health status is described, which reflects the influence of human bounded rationality on evaluation results in the evaluation process, and provides more accurate and rapid structural safety evaluation results for a shield tunnel in soft soil. The method comprises the steps: the health status of a shield tunnel and its possible distribution are determined, the index system and reference distribution function of shield tunnel structure health evaluation in soft soil area are determined, indicators are monitored, the possibility distribution function of monitoring data and its mapping function with the index reference distribution function are constructed, a profit and loss matrix is constructed, a value function is calculated, a weighting function is constructed, the comprehensive foreground value is calculated according to the value function and weighting function, and finally, the health status grade of the shield tunnel structure in soft soil is obtained according to the foreground theory.

Description

technical field [0001] The invention relates to the technical field of performance evaluation of shield tunnels, in particular to a method for evaluating the health status of shield tunnel structures in soft soil. Background technique [0002] With the rapid development of China's economy and the acceleration of urbanization, the subway has become an effective means to relieve the huge traffic pressure in the city. In urban underground tunnel engineering, shield method construction is a relatively mature and widely used construction technology at present. Compared with the traditional tunnel construction method, the shield tunneling method can effectively control the surface settlement, and the construction speed is fast, so it has become the first choice for urban underground tunnel engineering. Especially for soft soil areas, the shield method is the only feasible long tunnel construction method at this stage. [0003] As more and more subway shield tunnels are put into ...

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Problems solved by technology

[0004] Most of the existing tunnel health evaluation methods determine the health status based on the maximum contribution of the indicators, and cannot effectively consider the influence of other indicators, and the evaluation believes that people are completely rational, which cannot better reflect the monitoring indicators and the health status of the shield tunnel structure. The complex and changeable mapping relationship between

Another type of shield tunnel structural performance evaluation method based on variable weights has many indicators, which is not conducive to quickly evaluating the structural health of shield tunnels, especially soft soil shield tunnels

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