Numerical and Physical Modeling of Liquefaction Mechanisms in Layered Sands
Numerical and Physical Modeling of Liquefaction Mechanisms in Layered Sands
复制标题
层状砂液化机制的数值和物理模拟
DOI：
10.1061/40975(318)70
复制
发表时间：
2008
影响因子：
7.4
通讯作者：
M. Berilgen
中科院分区：
文献类型：
--
作者：
Pelin Özener;Kutay Özaydin;M. Berilgen
本文介绍了为深入了解层状砂土的液化机制而进行的振动台模型试验和数值模拟研究的结果。采用振动台试验系统，对不同相对密度、不同输入激励下的均匀砂柱、粉砂层间砂柱和双层砂柱进行了试验。通过安装在三个不同深度的孔隙水压力传感器测量动加载过程中产生的超孔隙水压力。采用Towhata-Iai液化模型，对均匀层状砂柱的动力特性进行了数值模拟。试验和数值分析结果表明，砂体内部渗透性较差的粉砂夹层和致密砂体下松散砂层的存在对液化行为有显著影响。
This paper presents the results of shaking table model tests and numerical modelling studies which were carried out to gain insight to liquefaction mechanisms in layered sand deposits. The experiments were performed by means of a shaking table testing system on uniform sand columns, silt interlayered sand columns and two layered sand columns deposited at various relative densities and subjected to different input excitations. Excess pore water pressures generated during dynamic loading were measured by pore water pressure transducers installed at three different depths. The physical model tests are also numerically modelled to analyse the dynamic behavior of uniform and layered sand columns by using the Towhata-Iai liquefaction model. The experimental and numerical analysis results revealed that the presence of a less permeable silt interlayer within the sand deposit and existence of a loose sand layer underlying dense sand deposits can have significant effect on the liquefaction behavior.