Three-dimensional analysis of tunnel face stability in spatially variable soils
Three-dimensional analysis of tunnel face stability in spatially variable soils
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DOI：
10.1016/j.compgeo.2019.03.005
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发表时间：
2019-07
影响因子：
5.3
通讯作者：
Hongzhan Cheng;Jian Chen;Ren-peng Chen;Juehao Huang;Jianhe Li
中科院分区：
文献类型：
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作者：
Hongzhan Cheng;Jian Chen;Ren-peng Chen;Juehao Huang;Jianhe Li
基于上界定理，提出了一种研究空间变土条件下隧道工作面极限状态的先进三维模型。进一步改进了生成随机场的矩阵分解方法，使土壤空间变异性能够以更少的计算量准确捕获。在均质和层状非均质土壤中建造隧道时，进行了验证演习，以证明所提出的模型与随机数值方法相比具有令人满意的性能。通过蒙特卡罗模拟进一步进行了敏感性研究，说明了抗剪强度的空间变异性的重要影响。
An advanced three-dimensional model is proposed to study the limit state of a tunnel face in spatially variable soils based on the upper bound theorem. The matrix decomposition method for generating the random field is further modified, allowing the soil spatial variability to be accurately captured with less computational effort. Verification exercises are carried out to demonstrate the satisfactory behaviour yielded by the proposed model in comparison with the random numerical method when tunnels are constructed in homogeneous and layered heterogeneous soils. Sensitivity studies are further performed via Monte Carlo simulations, illustrating the important effects of the spatial variability of the shear strength.