盾构隧道开挖面对数螺旋破坏模式研究  

Log-spiral failure mechanisms of the face stability of shield tunnels

作　　者：冯利坡[1] 郑永来[1] 李文峋[1] 邓树新[1] 

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《华中科技大学学报（自然科学版）》2013年第6期103-107,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学重大研究计划面上资助项目(90815008);国家人民防空办公室资助项目(0290235002)

摘　　要：利用水土压力统一计算理论,将盾构隧道开挖面涉及的水土压力分算参数和合算参数转变为统一参数,该方法可应用于土层为砂土和黏土的情况,特别适用于土层为黏质粉土及粉质黏土的情况.基于上述计算的统一参数和极限分析上限法,推导了考虑水压影响的开挖面对数螺旋破坏模式的极限支护压力解析解公式;并利用土层厚度加权平均法,对多层土体参数和水压力进行了简化分析,从而可将上述解析解公式应用于多层土盾构隧道开挖面稳定性评价中.结合上海长江隧道实例,利用推导的解析解公式对盾构隧道开挖面极限支护压力进行了计算,并将计算结果与前人研究进行了对比分析.结果表明:所建立的开挖面对数螺旋破坏模式可应用于盾构隧道开挖面稳定性评价中.By using the unified calculation theory of water and earth pressures, the parameters on the separated and combined calculation of water and earth pressures were turned into unified parameters, which can be applied to soil sand and clay, especially to clayey silt and silty clay. Based on the unified parameters and the upper-bound limit analysis, theoretical formula of the minimum support pressure to maintain the face stability of the homogeneous soil tunnel under high-water level condition was de- duced. Advantage of the soil thickness-weighted average method, the multi-layered soil parameters and the water pressure were to simplify the analysis. Then the theoretical formula above could be ap- plied to evaluate the face stability of the multi-layered soil tunnel. Taking Shanghai Yangtze River Tunnel as an example, the limit support pressure of tunnel face was calculated by the theoretical for- mula. The calculated results are a good agreement with the previous studies and engineering practice. Results show that log-spiral failure mechanisms can be applied in evaluating the face stability of shield tunnel.

关 键 词：盾构 隧道 开挖面稳定 极限支护压力 对数螺旋破坏模式 水土压力统一计算理论 

分 类 号：TU921[建筑科学—建筑设计及理论]