岩溶对地铁隧道围岩稳定性影响的数值模拟  

Numerical simulation for influence of karst cave on surrounding rock stability of subway tunnel

作　　者：苏锋[1] 郑文博[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地下建筑与工程系,上海200092

出　　处：《人民长江》2013年第3期25-29,共5页Yangtze River

基　　金：湖南省自然科学基金项目(07JJ3104)

摘　　要：以深圳某区间地铁建设为例,运用岩土隧道分析有限元软件MIDAS/GTS对其围岩稳定性进行了三维数值模拟研究。探讨了溶洞的不同分布位置、溶洞的尺寸及溶洞与隧道间的净距等因素,对地铁盾构施工过程中围岩稳定性的影响。结果表明,上述因素对隧道周边围岩的安全系数、变形、土层塑性区分布、土层中主应力的分布及衬砌管片的弯矩分布等均有较大影响。研究成果已应用于实际工程的建设中,对其他岩溶地区地铁施工有参考价值。Taking a tunnel sectionexcavation of Shenzhen Subway as an example, the finite element software MIDAS/GTS was adopted to conduct 3D numerical simulation of the stability of its surrounding rock. The influence of some factors on the stability of surrounding rock sucil as karst cave distribution, karst cave size, and the distance between karst cave and tunnel, are dis-cussed. The result shows that the above factors have influences on the tunnel safety coefficient, the deformation of surrounding rock, distribution of plastic zones, principal stresses, and the bending moment of lining segment in the soil layer. The analysis results have been applied in the practical engineering construction.

关 键 词：岩溶 围岩稳定性 数值模拟 盾构管片 地铁工程 

分 类 号：U455[建筑科学—桥梁与隧道工程]