PARTIALLY-DRAINED CYCLIC BEHAVIOR AND ITS APPLICATION TO THE SETTLEMENT OF A LOW EMBANKMENT ROAD ON SILTY-CLAY
PARTIALLY-DRAINED CYCLIC BEHAVIOR AND ITS APPLICATION TO THE SETTLEMENT OF A LOW EMBANKMENT ROAD ON SILTY-CLAY
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DOI：
10.3208/sandf.43.33
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发表时间：
2003-02
影响因子：
3.7
通讯作者：
A. Sakai;L. Samang;N. Miura
中科院分区：
文献类型：
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作者：
A. Sakai;L. Samang;N. Miura
摘要本研究探讨在填海低地沉积的软质粘性土上建造的低路堤道路上，由交通荷载引起的沉降现象。对原状有明软质粉质粘土进行了不排水和部分排水条件下的动三轴试验。根据试验结果，提出了一个模拟不同侧向应力作用下粉质粘土部分排水特性的模型。结果表明，最大超静孔压产生比和体积变化增加，直到循环应力比达到0.73的值，这是独立的横向应力的影响下，相同的各向异性固结比。应用所提出的模型进行数值分析，比较土壤厚度和循环加载时间在一天和一个周期的部分排水循环行为的影响。结果表明，循环与非循环加载时间之比较大时，对体积应变的影响小于循环加载总时间对体积应变的影响。通过对某低路堤公路沉降观测结果的分析，验证了该模型的适用性。
ABSTRACT This study examines the phenomenon of settlement induced by traffic loading on low embankment roads built on soft cohesive soils deposited in a reclaimed lowland. A series of cyclic triaxial tests were conducted on undisturbed soft Ariake silty-clay under undrained and partially-drained conditions. A model based on the test results is proposed to simulate the partially drained behavior of silty-clay under a variety of lateral stresses. It is shown that the maximum excess pore pressure generation ratios and volumetric changes increase until the cyclic stress ratio reaches a value of 0.73, which is independent of the effects of lateral stresses under the same anisotropic consolidation ratio. Numerical analyses applying the proposed model were performed to compare the effects of soil thickness and cyclic loading time during one day and one cycle on partially drained cyclic behavior. It was found that a large ratio of cyclic to non-cyclic loading time during one cycle exerts a smaller influence on volumetric strain than the total time of cyclic loading during one day. Observed settlement results of a low embankment road are analyzed to verify the applicability of the proposed model.