Bearing capacity factor Nc under ϕ=0 condition for piles in clays
Bearing capacity factor Nc under ϕ=0 condition for piles in clays
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DOI：
10.1002/nag.763
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发表时间：
2009-06
影响因子：
4
通讯作者：
V. N. Khatri;J. Kumar
中科院分区：
文献类型：
--
作者：
V. N. Khatri;J. Kumar
本文对粘聚力随深度线性增加的粘土中的轴向受荷桩在不排水条件下的承载力系数Nc进行了数值估算。研究遵循下限极限分析结合有限元和线性规划。提出了一种求解轴对称岩土稳定问题的新公式。Nc随埋深比的变化，得到了几个率的增加，土壤的凝聚力与深度，一个特殊的情况下，也检查时，桩基础被放置在硬粘土层覆盖的软粘土层。注意到，对于大于1的嵌入比，Nc的大小几乎达到恒定值。桩基础和桩身的粗糙度对Nc的影响很小。从本研究中得到的结果被发现比较相当不错，与文献中报道的不同的数值解。版权所有© 2008约翰威利父子有限公司。
Bearing capacity factor Nc for axially loaded piles in clays whose cohesion increases linearly with depth has been estimated numerically under undrained (ϕ=0) condition. The study follows the lower bound limit analysis in conjunction with finite elements and linear programming. A new formulation is proposed for solving an axisymmetric geotechnical stability problem. The variation of Nc with embedment ratio is obtained for several rates of the increase of soil cohesion with depth; a special case is also examined when the pile base was placed on the stiff clay stratum overlaid by a soft clay layer. It was noticed that the magnitude of Nc reaches almost a constant value for embedment ratio greater than unity. The roughness of the pile base and shaft affects marginally the magnitudes of Nc. The results obtained from the present study are found to compare quite well with the different numerical solutions reported in the literature. Copyright © 2008 John Wiley & Sons, Ltd.