General Axisymmetric Active Earth Pressure by Method of Characteristics—Theory and Numerical Formulation
General Axisymmetric Active Earth Pressure by Method of Characteristics—Theory and Numerical Formulation
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DOI：
10.1061/(asce)1532-3641(2007)7:1(1
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发表时间：
2007
影响因子：
3.7
通讯作者：
Y. Cheng;Y. Hu;W. Wei
中科院分区：
文献类型：
--
作者：
Y. Cheng;Y. Hu;W. Wei
本文推导了一般情况下轴对称问题的主动压力公式，并通过特征方程的迭代有限差分法求解。一般的侧应力系数，而不是哈尔-冯卡门假设和数值模拟也证实了哈尔-冯卡门假设是一个合理的假设，目前的问题，如果允许足够的壁运动。研究了破坏区的形状以及主动压力随深度和壁面摩擦力的变化规律。发现了有关拱作用产生的主动压力的一些有趣结果，讨论了土重、堆载和粘聚力影响的叠加原理。最后，将本文的研究成果应用于钻孔灌注桩的施工，证明在某些条件下不需要护筒施工。
Active pressure for axisymmetric problem under general conditions is formulated and solved by an iterative finite difference solution of the characteristic equations in the present paper. A general lateral stress coefficient is used instead of the Haar-von Karman hypothesis and numerical modeling has also confirmed that Harr-von Karman hypothesis is a reasonable assumption for the present problem if sufficient wall movement is allowed. The shape of the failure zone and variation of active pressure with depth and wall friction are investigated. Some interesting results on the active pressures arising from the arch action are found. Principle of superposition of the effect of soil weight, surcharge, and cohesive strength is discussed. Finally, the results in the present study are applied to bore pile construction and it is demonstrated that no casing for construction is required under some conditions.