Deep foundation pit stability evaluation method based on entropy weight-analytic hierarchy process fuzzy comprehensive evaluation method

Abstract

The invention discloses a deep foundation pit stability evaluation method based on an entropy weight-analytic hierarchy process fuzzy comprehensive evaluation method, and belongs to the field of geotechnical mechanics and engineering. The method not only considers objectivity of index weight empowerment, but also considers risk occurrence probability and accident damage loss degree, and mainly comprises the following steps: constructing an evaluation index system; determining an evaluation index weight based on an analytic hierarchy process; based on an entropy weight method, correcting the weight of the evaluation index; determining an index comprehensive weight; dividing security levels; determining a security level; and performing fuzzy comprehensive evaluation to obtain an evaluation score. According to the method, the difference coefficient is provided, linear weighted combination is carried out on each index weight calculated by the analytic hierarchy process and the entropy weight method based on the coefficient, and the stable state of the deep foundation pit is comprehensively and quantitatively evaluated by combining the refined deep foundation pit construction safety state grade evaluation table. According to the method, the problem that judgment of the matrix A is influenced by the expert experience level in an existing analysis method is solved, the evaluation indexes can be objectively and accurately weighted, and the credibility of weight calculation is improved.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and relates to a deep foundation pit stability evaluation method based on an entropy weight-analytic hierarchy process fuzzy comprehensive evaluation method. Background technique [0002] The stability of deep foundation pits is affected by many factors such as stratum conditions, groundwater distribution and surrounding building environment. There is often a certain deviation between the design of the supporting structure and the actual engineering needs. The monitoring data can reflect the force and deformation of the corresponding parts of the rock and soil in real time, which has an important guiding role in the design and adjustment of the foundation pit supporting structure. Therefore, it is of great engineering value and scientific significance to carry out research on monitoring data analysis methods for the stability assessment of deep foundation pits. [0003] At prese...

AI Technical Summary

Problems solved by technology

However, the analytic hierarchy process puts too much emphasis on the role of the experience level of decision makers, which makes the determination of the weight of evaluation indicators contain certain subjective factors.

The entropy weight method can objectively consider the effect of a single influencing factor, but because a set of recognized standard evaluation index models has not yet been formed in the current research field of deep foundation pit construction, it is easy to deviate from the actual situation simply by using the entropy weight method for index weight analysis result

Moreover, in the previous classification of the safety status of deep foundation pit construction, the safety level is often divided into 3-4 levels, with low precision. The selection and determination of the warning value needs to be set by expert experience, ignoring the occurrence of risks and damage losses, etc. Influence of Factors on Stability Evaluation of Deep Foundation Pit

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