Effects of Spatial Correlation on the Compression Behavior of a Cement-Treated Column
Effects of Spatial Correlation on the Compression Behavior of a Cement-Treated Column
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DOI：
10.1061/(asce)gt.1943-5606.0000850
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发表时间：
2013-08-01
影响因子：
3.9
通讯作者：
Koseki, Junichi
中科院分区：
文献类型：
--
作者：
Namikawa, Tsutomu;Koseki, Junichi
由于原位土性质的变化、搅拌效果的变化等因素，水泥深层搅拌处理的土体的强度变化很大，即使是单柱。强度的变化会影响水泥处理柱的整体性能。本文提出了一项数值实验，研究空间相关性对水泥处理柱无侧限抗压强度的影响。采用结合随机场理论的有限元分析来模拟全尺寸柱样品的无侧限压缩行为，其中材料特性随空间自相关而变化。数值结果表明，空间自相关影响全尺寸水泥处理柱的压缩行为。不存在空间自相关的样本的整体强度略低于平均强度均匀样本。另一方面，存在空间自相关的样本的整体强度显着低于平均强度均匀样本。这些结果表明，在相关设计程序中评估全尺寸水泥处理柱的整体强度时，应考虑空间自相关性。
The strength of soil treated by cement deep mixing varies greatly, even at a single column, because of the variability of in situ soil properties, the variability of mixing effectiveness, and other factors. The variation in strength would affect the entire behavior of the cement-treated column. This paper presents a numerical experiment that investigates the effect of spatial correlation on the unconfined compressive strength of cement-treated columns. Finite element analyses incorporating random-field theory were performed to simulate the unconfined compression behavior of full-scale column samples in which the material properties vary with respect to spatial autocorrelation. The numerical results indicate that spatial autocorrelation affects the compression behavior of full-scale cement-treated columns. The overall strength of the sample in the absence of spatial autocorrelation is slightly lower than that of the uniform sample of mean strength. On the other hand, the overall strength of the sample in the presence of spatial autocorrelation is significantly lower than that of the uniform sample of mean strength. These results suggest that spatial autocorrelation should be considered when evaluating the overall strength of full-scale cement-treated columns within a relevant design procedure.