强度折减法在盾构隧道开挖面稳定分析中的应用  

Application of Strength Reduction Method to Stability Analysis of Shield Tunnel Face

作　　者：乔金丽[1,2] 张义同[1] 高健[1] 李艳艳[2] 

机构地区：[1]天津大学机械工程学院,天津300072 [2]河北工业大学土木工程学院,天津300132

出　　处：《天津大学学报》2010年第1期14-20,共7页Journal of Tianjin University(Science and Technology)

基　　金：国家重点基础研究发展计划(973计划)资助项目(2007CB714001)

摘　　要：为了评价和指导设计施工时盾构隧道开挖面稳定的合理性,把强度折减法应用于盾构隧道开挖面的稳定性分析中,定义了盾构隧道开挖面稳定安全系数的概念,获得开挖面的稳定安全系数与潜在滑动面,并对影响开挖面稳定安全系数的隧道所在土层参数及开挖面的支护压力、地下水位等进行了分析.分析结果表明:弹性模量、泊松比等土层参数对开挖面稳定安全系数几乎没有影响,但是内摩擦角、黏聚力、开挖面支护压力和地下水位等因素对开挖面稳定安全系数的影响很大.To appraise and supervise the rationality of face stability in the design and construction of shield tunnels, strength reduction method has been applied to the analysis of stability of shield tunnel faces. Safety factor of the shield tunnel face has been defined so that the stability safety factor of the tunnel face and the corresponding slip face of the tunnel are obtained. The effect of soil parameters ,support pressure and ground water level on the safety factor of the face stability has also been analyzed. The analysis shows that the material parameters of soil and rock such as elastic modulus,the Poisson＇s ratio have little effect on the safety factor yet the friction angles of soil, cohesive forces, support pressures of tunnel faces and the levels of underground water have much effect on the safety factor.

关 键 词：强度折减法 开挖面稳定 安全系数 盾构隧道 

分 类 号：U455[建筑科学—桥梁与隧道工程]