Bias tunnel construction safety evaluation method based on variable weight fuzzy comprehensive evaluation

Abstract

The invention relates to a bias tunnel construction safety evaluation method based on variable weight fuzzy comprehensive evaluation. The method comprises the steps: 1, determining a bias tunnel construction safety evaluation index system: a first layer is a target layer, a second layer is a criterion layer, and a third layer is an index layer; wherein the criterion layer selects four evaluation indexes which comprises bias degree, surrounding rock characteristics, tunnel characteristics and hydrological characteristics; determining grading standards of the evaluation indexes; 2, obtaining anindex initial weight by adopting an analytic hierarchy process, and carrying out variable weight adjustment on the index initial weight according to the dynamic index data; 3, performing grade evaluation on the safety evaluation index system after variable weight adjustment based on fuzzy comprehensive evaluation; and 4, comprehensively judging the construction safety level of the bias tunnel according to the evaluation level. According to the method, a fuzzy variable weight analytic hierarchy process is applied to bias tunnel construction safety evaluation, and bias tunnel construction safetyevaluation is carried out in a more objective and effective manner, so that a safer construction method is obtained.

Description

technical field [0001] The invention belongs to the field of bias tunnel construction safety evaluation, in particular to a bias tunnel construction safety evaluation method based on variable weight fuzzy comprehensive evaluation. Background technique [0002] my country is a mountainous country with many mountains, so it is inevitable to build roads and railways on the slopes of hilly and mountainous areas. With the rapid and large-scale construction of highways in mountainous areas and the development of urban underground space, shallow buried tunnels have become an important form of traffic structures. In the construction of roads in mountainous areas, whether it is a railway or a highway, many lines are limited and affected by the natural geographical environment and other factors, and often need to pass through the slopes of the mountain, and most of the lines pass through the mountain in the form of tunnels, and there is mostly bias at the tunnel entrance. The burial ...

AI Technical Summary

Problems solved by technology

However, due to the changes in the environment of the unbalanced tunnel, there are many uncertain factors, especially the inherent spatial variability of the rock and soil itself, which makes the uncertain factors that should be considered in the stability analysis of the tunnel engineering more complicated.

Therefore, there will be a high degree of risk in using the AHP to analyze and evaluate the construction stability of unbiased tunnels.

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