COMPREHENSIVE ANALYSIS METHOD FOR ADVANCED FORECAST OF GEOLOGY IN TUNNELS

Abstract

By the analysis of physical difference of tunnel media and comparative evaluation of suitability of common advanced prediction of geology,a principle of comprehensive prediction that takes the geological analysis as the target,combining geological analysis and geophysical exploration,considering the condition inside and outside of the tunnel,employing long-term and short-term prediction methods,and adopting mutual geophysical parameters,is proposed. The system and organization of comprehensive geological prediction in tunnels are established. Then,the comprehensive prediction workflows of common unfavorable geological conditions such as fault,breaking of rock mass,enriched groundwater,karst,soft rock mass in tunnels are presented. Parameters of relevant geological and geophysical prospecting characteristics are given;and comprehensive classification system is built. Finally,a comprehensive prediction model for solving geological problems has been constructed with fuzzy neural network(FNN). The comprehensive prediction system is used in Tongluoshan karst tunnel and the accuracy of the prediction is 80%.