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分享一篇Geotechnique 关于基坑支护结构的文章:Effect of spatial variation of s...

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YONLIU 发表于 2016-1-10 16:13:52 | 显示全部楼层 |阅读模式
本帖最后由 三T上人 于 2016-7-22 11:23 编辑 <br /><br />Effect of spatial variation of strength and modulus on the lateral compression response of cement-admixed clay slab
ABSTACT
In deep excavation construction, improved soil layers consisting of overlapping cement-admixed columns formed by deep mixing method or jet grouting is often used to stabilize an excavation in soft soils. The purpose of this soil layer is to resist lateral compression generated by movement of the retaining wall. Cement-admixed soils are well-known to have high heterogeneity in strength. In this paper, the heterogeneity in strength and stiffness is studied using random finite element analyses, considering three sources of variation, namely a deterministic radial trend in strength and stiffness, a stochastic fluctuation component due to non-uniform mixing and positioning errors arising from off-verticality of the mixing shafts. The results show that positioning errors have the largest effect on the strength of the slab as a whole whereas the radial trend has the smallest effect, when normalized by the volume-average strength. Based on the results obtained, methods are proposed which allow equivalent homogeneous mass strength and stiffness of the improved slab to be determined for a chosen percentile of exceedance or reliability index, which can be used in deterministic finite element analyses.
KEYWORDS: cement-admixed clay; spatial variability; mass behaviour; random finite element analysis

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Effect of spatial variation of strength and modulus on the lateral compression r.pdf

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cdddd 发表于 2016-1-10 19:19:48 | 显示全部楼层

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本帖最后由 三T上人 于 2016-7-22 11:23 编辑 <br /><br />强度和模量空间变化对后期强度的影响

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清风小筑 发表于 2016-1-14 10:46:05 | 显示全部楼层
本帖最后由 三T上人 于 2016-7-22 11:23 编辑 <br /><br />好资料。。。。

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