Effect of spatial variability of block-type cement-treated ground on the bearing capacity of foundation under inclined load
Effect of spatial variability of block-type cement-treated ground on the bearing capacity of foundation under inclined load
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DOI：
10.1016/j.sandf.2019.11.007
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发表时间：
2019-12-01
影响因子：
3.7
通讯作者：
Kitazume, Masaki
中科院分区：
文献类型：
--
作者：
Kasama, Kiyonobu;Whittle, Andrew J.;Kitazume, Masaki
深层搅拌方法广泛用于稳定软粘土并提高其承载力。然而，水泥处理地面的抗剪强度的空间变化给设计承载力的估计带来了不确定性。本文使用随机场数值极限分析评估了块状水泥处理地基在倾斜荷载条件下的可靠性。不排水抗剪强度被建模为随机场，其特征在于对数正态分布和空间相关长度。然后使用蒙特卡罗模拟来解释在水泥处理地面与原始粘土的抗剪强度比、不排水抗剪强度的变异系数和水泥处理区的相关长度的选定比率下倾斜同心加载条件下的随机承载力因子和破坏机制。与均匀混合的粘土相比，不排水抗剪强度的变化会使水泥处理过的地面的预期承载力降低 50-70%。 (C) 2019 年由 Elsevier B.V. 代表日本岩土工程学会制作和主办。
Deep mixing methods are widely used for stabilizing soft clayey soils and improving their bearing capacity. However, spatial variability in the shear strength of the cement-treated ground introduces uncertainties in estimating the bearing capacity for design. This paper evaluates the reliability of, block-type, cement-treated foundation under inclined load conditions using random field numerical limit analyses. The undrained shear strength is modelled as a random field which is characterized by a log-normal distribution and a spatial correlation length. Monte Carlo simulations are then used to interpret the stochastic bearing capacity factor and failure mechanisms for inclined concentric loading conditions at selected ratios of the shear strength ratio of cement-treated ground to original clay, the coefficient of variation in undrained shear strength and correlation length of the cement-treated zone. Variability of the undrained shear strength can reduce the expected bearing capacity of the cement-treated ground by 50-70% compared to homogeneously mixed clay. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.