Research On Comprehensive Fuzzy Assessment Of Slope Anchor Cable Prestress Loss

Prestress loss of anchor cable exists objectively,but it is difficult to calculate the loss value accurately and quantitatively.Up to now,the most common solution to the problem of prestress loss is to overstretch or compensate the prestress cable.This method can reduce the prestress loss of anchor cables to a certain extent,but the excessive overtension will cause damage to the cable body,and it will be difficult to compensate the tension construction.Therefore,it is necessary to comprehensively understand the factors affecting the prestress loss of anchor cables and explore its mechanism,so as to lay a foundation for the evaluation of prestress loss of anchor cables and serve the design and construction of anchor cables to some extent.On the basis of collecting and analyzing the anchoring data of the prestressed anchor cable of the slope,the influencing factors and loss mechanism of the prestressed anchor cable of the slope are systematically summarized and discussed.Based on t he fuzzy mathematical theory,a complete fuzzy comprehensive evaluation model of prestress loss of anchor cable is established,and the model is used to judge the prestress loss of slope anchor cable,so as to better judge the anchoring effect of slope anc hor cable.In the fuzzy comprehensive evaluation model,the analytic hierarchy process(ahp)is used to judge the relative importance of the factors affecting the prestress loss of anchor cable.Through theoretical analysis and model evaluation,the prestress loss of anchor cable and the site safety of slope can be judged more accurately.Finally,taking a cutting slope on the left of national highway 323 in leshao,guangdong province as an example,the feasibility and accuracy of the model are verified by collecting and analyzing the monitoring data of slope displacement and comparing the evaluation results of the comprehensive fuzzy evaluation model.Based on the analysis and summary of the previous research results on the factors affecting the prestress loss of prestressed anchor cable,this paper analyzes the evaluation index of the prestress loss of slope anchor cable,and the main work completed is as follows:(1)analysis and statistics of various influencing factors of anchor cable prestress loss;(2)to determine the evaluation factor of the comprehensive evaluation model of anchor cable prestress loss;(3)establish a comprehensive evaluation model for prestressed loss of anchor cable;(4)compare and analyze the results of model evaluation and actual d isplacement monitoring data with engineering examples to verify the applicability and accuracy of the evaluation model.