山岭隧道大型溶洞落石冲击数值分析  

NUMERICAL ANALYSIS OF ROCKFALL IMPACT IN LARGE KARST CAVES OF MOUNTAIN TUNNELS

作　　者：张远明 宋梓栋 李华[1] ZHANG Yuanming;SONG Zidong;LI Hua(CCCC Second Highway Consultant Co.,Ltd.,Wuhan 430056,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉430056

出　　处：《低温建筑技术》2024年第6期83-86,90,共5页Low Temperature Architecture Technology

摘　　要：为研究溶洞区域可能存在的落石对山岭隧道结构受力的影响,文中以一项存在大型溶洞的山岭隧道工程为背景,通过建立考虑落石冲击力的隧道结构有限元模型,分析了不同重量落石情况下结构内力等的变化影响。结果表明衬砌拱脚与拱顶处结构内力较大,衬砌结构需要考虑拱脚适当扩大;随落石重量增加,结构弯矩增幅小于结构轴力增幅;35m高度处落石重量最大为80t时,隧道外拱衬砌满足承载能力极限状态设计要求。研究可为类似工程的落石处治分析提供参考。This paper studies the impact of possible rockfall in the karst cave on the structural stress of the moun-tain tunnel.A finite element model of the tunnel structure is established to analyzed the influence of changes in inter-nal forces under different weight of falling rocks,which is based on a mountain tunnel project with a large karst.The results indicate that the internal forces of the lining arch foot and arch crown are relatively large,and the lining struc-ture needs to consider the appropriate expansion of the arch foot.As the weight of falling rocks increases,the in-crease in structural bending moment is smaller than the increase in structural axial force.In addition,when the maxi-mum weight of falling stones at a height of 35 m is 80 tons,the outer arch lining of the tunnel meets the design re-quirements for ultimate bearing capacity.This study may provide the reference for the analysis of rockfall treatment in similar projects.

关 键 词：山岭隧道溶洞 落石冲击 极限落石重量 

分 类 号：TU452[建筑科学—岩土工程]