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Behaviour of large post-liquefaction deformation in saturated sand-gravel composites

ISSN号：1000-131X
期刊名称：《土木工程学报》
时间：0
分类：O4-33[理学—物理] TB33[一般工业技术—材料科学与工程]
作者机构：[1]Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing 210009, China, [2]Geotechnical Research Institute, Hohai University, Nanjing 210098, China
相关基金：Project（90715018） supported by the National Natural Science Foundation of China; Project（200808022） supported by the Special Fund for the Commonweal Indusry of China; Project（08KJA560001） supported by the Key Basic Research Program of Natural Science of University in Jiangsu Province; Project（CX10B 170Z） supported by the Postgraduate Scientific Innovation Program in Jiangsu Province, China

关键词：复合材料, 变形行为, 砂砾石, 饱和, 液化, 应力应变关系, 孔隙水压力, 应力应变响应, saturated sand-gravel composites, post-liquefaction deformation, stress-strain relation, dissipation model： pore water pressure

中文摘要：

浸透的沙石子 composites 的液化以后的变丑上的实验室测试被执行由空柱体仪器调查压力紧张关系和毛孔水压力的驱散的特征。压力紧张反应和毛孔水压力的驱散过程由三个阶段组成，这被发现，包括低集中的力量阶段， superlinear 力量恢复阶段和 sublinear 力量恢复舞台，并且毛孔水压力的曲线的分界点是压力紧张反应落后于那些。在浸透的沙石子 composites 和南京好沙之间的大液化以后的变丑的行为的比较结果证明低集中的力量阶段和 superlinear 力量恢复浸透的沙石子 composites 上演当 sublinear 力量恢复阶段更长时，更短。一个压力紧张模型和液化沙石子 composites 的过量毛孔水压力的一个驱散模型被建立，在哪个起始的限制压力和相对密度能综合地被考虑。并且由二个模型的预言的结果在对试验性的数据的好同意，这被发现。

英文摘要：

The laboratory tests on the post-liquefaction deformation of saturated sand-gravel composites were performed to investigate the characteristics of stress-strain relation and the dissipation of pore water pressure by the hollow cylinder apparatus. It is found that the stress-strain response and the dissipation process of pore water pressure are composed of three stages, including the low intensive strength stage, the superlinear strength recovery stage and the sublinear strength recovery stage, and the demarcation points of the curve of pore water pressure are lag behind those of the stress-strain response. The comparison results of the behaviour of large post-liquefaction deformation between saturated sand-gravel composites and Nanjing fine sand show that the low intensive strength stage and the superlinear strength recovery stage of saturated sand-gravel composites are shorter while the sublinear strength recovery stage is longer. A stress-strain model and a dissipation model of excess pore water pressure of liquefied sand-gravel composites are established, in which the initial confining pressure and the relative density can be considered synthetically. And it is found that the predicted results by the two models are in good agreement with experimental data.

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