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Liquefaction Study of Heterogeneous Sand: Centrifuge

机译:异质砂液化研究:离心机

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From past numerical research and small scale laboratory tests, it has been observed that more excess pore water pressure (EPWP) is generated during earthquakes in a heterogeneous sand deposit than in the corresponding homogeneous sand with relative density equal to the average relative density of the heterogeneous sand. This interesting phenomenon is investigated here in large scale experiments using geotechnical centrifuge modeling techniques. A series of liquefaction tests have been conducted at C-CORE's geotechnical centrifuge facility: Two on variable sand and one on uniform sand deposits. A one level frame structure resting on two strip footings was also placed on that sand deposit to study the effect of soil variability on building foundations. Experimental results such as accelerations, EPWPs and settlements were monitored and measured throughout the tests. Recorded results support the conclusion of previous research that more EPWP is generated in heterogeneous sand deposits than in the corresponding homogeneous sand. The liquefaction mechanism of heterogeneous sands leading to this phenomenon is discussed in this paper.
机译:从过去的数值研究和小规模的实验室测试中可以看出,与非均质砂土平均密度相对应的相应均质砂土相比,非均质砂矿床在地震过程中产生的多余孔隙水压力(EPWP)更多。砂。在这里,使用岩土离心模型技术在大规模实验中研究了这种有趣的现象。在C-CORE的岩土离心机设施中进行了一系列液化试验:两次在可变的沙子上,一个在均匀的沙子上。还把一个搁置在两个条形基础上的一级框架结构放置在该沙土上,以研究土壤变异性对建筑基础的影响。在整个测试过程中,对加速度,EPWP和沉降等实验结果进行了监视和测量。记录的结果支持先前研究的结论,即非均质砂沉积物中产生的EPWP比相应的均质砂中产生的EPWP更多。本文讨论了导致这种现象的非均质砂土的液化机理。

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