Upper Bound Solution for Required Supporting Pressure Applied on a Deep Shield Tunnel Face Under Different Groundwater Levels
Upper Bound Solution for Required Supporting Pressure Applied on a Deep Shield Tunnel Face Under Different Groundwater Levels
复制标题
不同地下水位下深部盾构隧道掌子面所需支护压力上限解
DOI：
10.1007/s10706-018-0584-x
复制
发表时间：
2018
影响因子：
1.7
通讯作者：
Jia cheng Song
中科院分区：
文献类型：
--
作者：
Jia hua Zhang;Wei jun Wang;Biao Zhang;Dao bing Zhang;Jia cheng Song
地下水的存在对盾构法隧道的施工有很大的影响。基于极限分析上限定理，对孔隙水压力作用下盾构隧道掌子面的稳定性进行了分析研究。考虑土体强度的非线性特征，采用幂律型非线性破坏准则，利用切线法确定其等效Mohr-Coulomb强度参数。建立了盾构隧道掌子面对数螺旋破坏机理，总结了地下水位与该机理关系的三种不同情况。在此基础上，计算了各外力的功率和内力的耗能率，并推导出了支承压力的解析表达式。通过优化计算得到了关于指定参数的数值解。进行了参数分析，给出了所需支护压力随地下水位高度的变化规律。
The construction of shield tunnels is greatly influenced by the presence of groundwater. Based on the upper bound theorem of limit analysis, this paper presents an analytical investigation on the stability of shield tunnel face subjected to the impact of pore water pressure. Considering the nonlinear strength feature of soil mass, the nonlinear failure criterion of power-law type is employed, and the tangential technique is utilized to determine its equivalent Mohr–Coulomb strength parameters. The log-spiral failure mechanism for shield tunnel face is constructed, and three different cases of the relation between groundwater level and this mechanism are summarized. After that, rates of work of external forces and rate of internal energy dissipation are computed and analytical expression for the supporting pressure is deduced. Numerical solution with respect to specified parameters is calculated through optimization. Parametric analysis is performed and the variation of required supporting pressure with increasing height of groundwater level is presented.