溶洞对地铁隧道开挖稳定性影响的数值分析  

Numerical Analysis on Effect of Karst Cave on Stability in Metro Tunnel Excavation

作　　者：李培楠[1] 刘俊[2] 苏锋[1] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学测绘与地理信息学院,上海200092

出　　处：《路基工程》2013年第4期76-81,共6页Subgrade Engineering

基　　金：国家自然科学基金项目(41272289);福建省教育厅科技计划项目(JA04253);深圳市地下铁道设计院科研项目

摘　　要：利用岩土工程有限元软件MIDAS/GTS,对深圳轨道交通3号线区间地铁建设中的围岩稳定性进行三维数值分析,探讨了溶洞的不同分布位置、溶洞的尺寸大小及溶洞与隧道间的不同净距对地铁施工过程中围岩稳定性的影响。分析结果表明:上述各种因素对隧道周边围岩的变形、安全系数、土层塑性区和主应力的分布以及隧道衬砌环的弯矩分布等均有较大影响。当隧道拱腰侧面溶洞较大时,施工中应加强溶洞自身稳定的处理,以保安全。研究结果目前已用于实际工程的建设中,且对其他类似区域的盾构隧道施工有参考价值。With the finite element software MIDAS/GTS for geotechnical engineering, 3D numerical analysis was carried out in relation to the stability of the surrounding rock in the interval metro construction for the Rail Transit Line 3 in Shenzhen, which discussed how distribution and size of karst cave, and net distance between the cave and the tunnel affect the stability of the surrounding rock there in the course of the metro construction.＇ The result shows that the considerations mentioned above have relatively large effect on the roek deformation, safety factor, and distribution Of the plastic zone, principal stress and bending moment of tunnel lining ring. Where the karst cave at the tunnel hance side is large, the stability of the cave should, for the purpose of security, be strengthened in the construction. The research result has been applied in the practical engineering and may be referred by other construction of shield tunnel in similar area.

关 键 词：岩溶 地铁 围岩稳定性 数值分析 盾构隧道衬砌环 

分 类 号：TU457[建筑科学—岩土工程]