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Design equations for undrained stability of opening in underground walls

机译:地下洞室不排水稳定性的设计方程式

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摘要

Undrained stability of an opening in underground walls in clays with constant and linearly increasing shear strengths with depth was investigated by two-dimensional finite element limit analysis under plane strain condition. Three parametric studies were performed to study the effects of the cover depth ratio, overburden stress factor and linear strength gradient ratio on the load factor of the opening in underground walls. Predicted failure mechanisms associated with these parameters were discussed and examined. New design equations for the undrained stability of an opening in underground walls in clays with an arbitrary linear increase in strength with depth were developed for a practical application in the field of trenchless constructions.
机译:在平面应变条件下,通过二维有限元极限分析,研究了具有恒定且线性增加的剪切强度随深度变化的黏土中地下壁孔的不排水稳定性。进行了三项参数研究,以研究覆盖深度比,上覆应力因子和线性强度梯度比对地下墙洞口荷载因子的影响。讨论并检查了与这些参数相关的预测故障机制。开发了新的设计方程,用于粘土中地下壁的开口的不排水稳定性,其强度随深度呈任意线性增长,从而可在非开挖建筑领域中得到实际应用。

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