A new simplified method for calculating consolidation settlement of multi-layer soft soils with creep under multi-stage ramp loading
A new simplified method for calculating consolidation settlement of multi-layer soft soils with creep under multi-stage ramp loading
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DOI：
10.1016/j.enggeo.2019.105322
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发表时间：
2020
影响因子：
7.4
通讯作者：
W. Feng;Jianhua Yin;Wen-Bo Chen;D. Tan;P. Wu
中科院分区：
文献类型：
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作者：
W. Feng;Jianhua Yin;Wen-Bo Chen;D. Tan;P. Wu
在实际工程中，软土地基通常采用多级堆载的方法来达到一定的强度，因此研究多级堆载作用下软土地基的沉降规律具有重要意义。本文提出了一种新的计算多层软土蠕变沉降的简化方法。采用朱银法计算了多层地基在各加载阶段的平均固结度。阐述了蠕变压缩对固结阶段超静孔隙水压力和总沉降的影响。随后，两个典型的工程，Skelet-Edeby与46年的记录沉降数据和公路路堤在Berthierville地区，被选为典型的多层土壤剖面。采用新的简化方法和假设A方法对三种荷载和两种超固结比（OCR）值的情况进行了有限元分析。以有限元分析结果为参考，新的简化方法对各种情况下的沉降都有较好的估计，其精度优于假设A法。
In normal practice, a multi-stage surcharge loading is applied gradually to achieve a certain strength of soft soils, and thus it is important to study the settlement of soft soils under multi-stage ramp loading. In this study, a new simplified method is developed to calculate the settlement of multi-layer soft soils exhibiting creep subjected to the multi-stage loading under a one-dimensional straining condition. The Zhu and Yin method is utilized to obtain the average degree of consolidation for multi-layer soils under each loading stage. The effects of creep compression on excess pore water pressure and total settlement during consolidation stage are elaborated. Subsequently, two typical projects,Skå-Edebywith 46 years’ recorded settlement data and highway embankment in theBerthiervillearea, are selected as the typical multi-layer soil profiles. Cases with three different loadings and two different over consolidation ratio (OCR) values are analyzed using the finite element modeling, namely the new simplified method, and the Hypothesis A method. With the use of the results from finite element analysis as the reference, the new simplified method offers a good estimation of the settlement for all the cases and outperforms the Hypothesis A method in terms of accuracy.