Influence mechanism and calculation of the minimum safe thickness of waterproof rock mass in karst tunnels

作     者：AN Pengtao LI Maoxiang ZHANG Wenjun LIU Xiong AN Pengtao;LI Maoxiang;ZHANG Wenjun;LIU Xiong

作者机构：Guangxi UniversityNanning 530000China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresGuangxi UniversityNanning 530000China 

出 版 物：《Journal of Mountain Science》 (山地科学学报(英文))

年 卷 期：2025年第22卷第2期

页      面：695-709页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：jointly funded by the guangxi Science and Technology Base and Talent Project(AD23026104) the Key Research and Development Program Project in Guangxi(AB23026121) 

主　　题：Tunnel engineering Water inrush disaster Safe thickness Waterproof rock mass Concealed karst cave 

摘      要：Due to the influence of karst cave development and route selection,the location relationship between concealed karst cave and tunnel is more *** order to explore the influence rule of karst cave location on the minimum safe thickness of water-proof rock mass,a simplified calculation model of water-proof rock mass thickness when the karst cave is located at any location around the tunnel is established,and the influence of multiple factors on the overall stability of water-proof rock mass is *** on the cusp catastrophe theory,the analytical expressions for the safety thickness of waterproof rock mass are *** on the finite difference principle,the analytical expressions of the safety thickness of water-proof rock mass are *** order to improve the application range of the analytical formula derived in this paper,the analytical formula is optimized based on the instability principle differences between the simplified calculation model and the elastic compressive *** research results show that the necessary condition solution is more applicable and much safer than the sufficient condition *** stress,rock beam length and karst cave water pressure are significantly positively correlated with the safe thickness of the waterproof rock *** calculated results of the semioptimized formula and the unoptimized formula are constant values,independent of the karst cave *** the calculated results of the fully optimized formula are variable values,correlated with the karst cave location,the thickness of the waterproof rock mass gradually decreases as the karst cave location moves from the top of the tunnel to the bottom of the *** unoptimized formula does not consider the influence of the lateral force of the rock beam,and is not suitable for the working condition with large lateral force,the calculation results of the semi-optimized formula and the fully optimized formula are not very different and are bia