某岩溶隧道支护结构的处治效果分析  

Analysis of treating effect of supporting structure of a karst tunnel

作　　者：程灏 胡兴[2] 

机构地区：[1]贵州高速集团有限公司,贵州贵阳550009 [2]贵州大学,土木工程学院,贵州贵阳550025

出　　处：《贵州大学学报（自然科学版）》2016年第3期126-130,共5页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金项目批准号(11562005)

摘　　要：结合某岩溶隧道工程,分析其岩溶发育的特征和机理,利用有限差分软件FLAC^(3D)对侧部溶洞和底部溶洞处治前后的隧道施工过程进行数值模拟,评价其处治效果。结果表明:出露的溶洞在处治后,侧部溶洞拱顶位移减小了8.9%,拱底位移减小了4.9%,锚杆轴力减小7.7%,而拱脚压应力增大39.7%,拱腰压应力增大10.7%,隧道底部和顶部出现塑性区;底部溶洞处治后拱底位移减小了18.2%,锚杆轴力和最大主应力变化不大,而拱顶位移增大1.03%,底部塑性区范围增大。In combination with the construction process of a karst tunnel,the characteristics and mechanisms of the karst development are analyzed. Construction processes as karst cave in lateral part and karst cave in bottom before and after treatment are simulated by using the finite difference software FLAC^（3D）. And treatment effects are evaluated. After treatment,vault displacement of karst cave in lateral part reduces 8.9%,arch bottom displacement reduces 4.9%,anchor stress reduces 7.7%. But arch foot compressive stress increases 39.7%,arch haunch compressive stress increases 10.7% and the top and bottom of tunnel grows plastic zone. After treatment,arch bottom displacement of karst cave in bottom reduces 18. 2%. Anchor stress and the maximum principal stress change a little. But vault displacement increases 1.03% and plastic zone in bottom increases a lot.

关 键 词：岩溶隧道 隧道开挖 FLAC3D模拟 治理效果 

分 类 号：U455[建筑科学—桥梁与隧道工程]