考虑渗流的多层土盾构隧道开挖面稳定性分析  

Stability analysis of shield tunnel face in multilayer soil with seepage

作　　者：乔金丽[1] 张义同[1] 高健[1] 

机构地区：[1]天津大学机械工程学院,天津300072

出　　处：《岩土力学》2010年第5期1497-1502,共6页Rock and Soil Mechanics

基　　金：国家重点基础研究发展计划(973计划)(No.2007CB714001)

摘　　要：将传统模式的均匀土层稳定性分析的楔形体模型扩展到渗流作用下多层土盾构隧道开挖面的稳定性分析中,楔形体是由梯形组成的,每一个梯形对应一层土层,利用太沙基有效松动土压力理论和上限定理,推导了渗流作用下盾构穿越多层土的隧道开挖面极限支护压力的计算公式。极限支护压力等于作用于开挖面有效支护压力和渗透力的总和,其中有效支护压力用极限平衡来计算,渗流力采用水头分布的数值方法计算获得的。计算结果发现,渗透力构成了总支护压力的主要部分,分析结果和工程实测数据是一致的。The traditional model of wedge for stability analysis of tunnel face under homogenous soil is extended to encompass multilayer soil with seepage;the wedge consists of trapezoids and each trapezoid is related to a layer of soil;the Terzaghi’s theory and upper limit theorem are applied to derive the equation for limit support pressure.The limit support pressure is the sum of the effective support pressure and seepage force;the former is obtained from limit equilibrium analysis and the latter is evaluated by means of numerical analysis of head distribution.It is found that the seepage force is the main portion of the limit support pressure.The analytical results are consistent with measured data in engineering.

关 键 词：开挖面稳定 渗流 极限支护压力 上限定理 多层土 

分 类 号：U451[建筑科学—桥梁与隧道工程]