循环动载下软黏土路基变形响应的离心试验模拟

发布时间：2018-03-05 00:35

本文选题：离心模型　切入点：饱和软土地基　出处：《岩土工程学报》2017年S2期 　论文类型：期刊论文

【摘要】：介绍了动力离心模型试验的关键性试验技术及循环动载下饱和软土累计变形响应规律。路面结构分别采用刚性路基板,路基基层采用压密的砂垫层模拟,地基采用上海地区的饱和软黏土,并考虑了地基土的超固结效应。详细探讨了离心试验过程中若干试验技术的实现过程,包括饱和黏土的重塑土制样技术、重力场的固结技术及不同超固结比的实现技术,并给出了如何在离心场实现地基变形的图像分析技术(PIV)。最后,给出典型的试验观察成果,揭示往复动载下饱和软黏土累计变形时空演变规律。试验表明,累计超孔压表现为先增大后减小的变化规律;通过PIV技术分析发现,在循环动作用下饱和软黏土路基竖向变形影响区域随着循环次数的增大而增大。
[Abstract]:This paper introduces the key test technology of dynamic centrifugal model test and the cumulative deformation response law of saturated soft soil under cyclic dynamic load. In this paper, the saturated soft clay in Shanghai area is adopted, and the overconsolidation effect of the foundation soil is considered. The realization process of several test techniques in the process of centrifugal test is discussed in detail, including the technology of remolding soil sample of saturated clay. The consolidation technology of gravity field and the realization technology of different overconsolidation ratio are given, and the image analysis technique of how to realize the foundation deformation in centrifugal field is given. Finally, the typical experimental observation results are given. The temporal and spatial evolution of saturated soft clay deformation under reciprocating dynamic load is revealed. The experimental results show that the cumulative superpore pressure increases first and then decreases. The area affected by vertical deformation of saturated soft clay roadbed increases with the increase of cycle times.
【作者单位】：同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;
【基金】：国家自然科学基金项目(51238009,51578413)
【分类号】：U416.16

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