穿越古滑坡的浅埋偏压连拱隧道动态施工响应规律  

DYNAMIC CONSTRUCTIONAL RESPONSE OF A SHALLOW-BURIED AND UNSYMMETRICAL-LOADED DOUBLE-ARCH TUNNEL ACROSS AN ANCIENT LANDSLIDE

作　　者：杨小永[1] 伍法权[1] 苏生瑞[2] 

机构地区：[1]中国科学院工程地质力学重点实验室,北京100029 [2]长安大学地测学院地质工程系,西安710054

出　　处：《工程地质学报》2006年第3期314-319,共6页Journal of Engineering Geology

基　　金：云南省交通建设科技项目(合同号TST(2004)538133C)项目名称:连拱隧道地质超前预报及施工控制技术

摘　　要：复杂地质条件下地下工程围岩稳定性问题,一直是地质工程界备受关注的热门议题。文中针对云南思茅-小勐养高速公路曼歇4号连拱隧道的特殊复杂地质结构,通过数值模拟对穿越古滑坡的浅埋偏压连拱隧道施工过程围岩应力场、位移场和塑性区变化规律进行了数值分析,从而有效揭示出施工各阶段围岩应力集中位置和潜在塑性破坏区,不仅为隧道的安全顺利施工提供了预警信息和直接指导,同时为连拱隧道的优化设计提供可靠的理论依据。在穿越古滑坡的浅埋偏压连拱隧道施工中,应高度重视古滑坡的彻底治理和中隔墙的支护加固,从而确保整座连拱隧道的围岩稳定和安全运营。Surrounding rock - mass stability of underground engineering under complex geological conditions has been one of the hot topics for engineering geologists. This paper presents a case study of a double - arch tunnel Manxie No.4, one of Simao - Xiaomengyang expressway tunnels, encountered an extremely complicated geological structure. The authors simulated the dynamic constructional response of a shallow - buffed and unsymmetrical - loaded double - arch tunnel across ancient landslide, including press field, displacement field and plastic zones in surrounding rock - mass. In addition, locations of stress concentration and potential failure zones are clearly delineated in rock - mass, which will not only provide information needed for guiding the construction of the tunnel, but also establish valid theoretical evidence for optimal design of the tunnel. At the end, the authors emphasize that complete treatment of whole ancient landslide and sufficient reinforcement of partition wall should be taken to ensure stability of surrounding rock - mass and safety of the whole double - arch tunnel.

关 键 词：古滑坡 浅埋 偏压 连拱隧道 动态施工 响应规律 

分 类 号：U455[建筑科学—桥梁与隧道工程] P642.22[交通运输工程—道路与铁道工程]