Study on Safety Evaluation Method of Groundwater for Extra - large Corridor Backfill Karst Tunnel

Abstract

The groundwater has a significant on the construction of the large-scale corridor back-type karst tunnels, so it is particularly essential to carry out safety evaluation. In view of the technical problems of groundwater safety evaluation in the construction of large-scale corridor back-type karst tunnels, this paper uses BP neural network combines with AHP analysis to determine the weight of each index on the basis of the characteristics of backfill and evaluation criteria. Furthermore, the fuzzy evaluation model of groundwater safety for backfill karst tunnels is established, and a new method of groundwater safety evaluation for large-scale corridor backhoe-type karst tunnels is proposed. The results of the case study show that the results of the evaluation of groundwater safety of the large-scale backhoe-type karst tunnels are consistent with the engineering practice, which show that the evaluation index system and the evaluation method adopted in this paper are reasonable, and can provide reference for the safety evaluation of groundwater environment similar to tunnel engineering.