Cyclic Pore Pressure Generation, Dissipation and Densification in Granular Mixes
Cyclic Pore Pressure Generation, Dissipation and Densification in Granular Mixes
复制标题
颗粒混合物中循环孔隙压力的产生、耗散和致密化
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
T. Shenthan
中科院分区：
文献类型：
--
作者：
S. Thevanayagam;T. Shenthan
了解砂土、粉砂和粉土在循环荷载作用下的孔压产生、液化后消散和体密化特征，对于分析地震区松散饱和颗粒堆积体的性能是非常重要的。本文介绍了对含0%~100%非塑性粉土的这类土的这些特性的试验研究结果。通过不排水循环三轴试验研究了孔压产生特性。根据循环试验前的固结数据和不排水循环试验后的孔压消散试验，确定了液化前后的压缩系数和固结系数，以及液化后的体积密实度特征。与纯砂相比，细粒含量对这些特性的影响是在晶间孔隙率和晶间接触密度概念的背景下进行的。
Knowledge of cyclic load induced pore pressure generation, post-liquefaction dissipation and volumetric densification characteristics of sands, silty sands, and silts are important for the analysis of performance of loose saturated granular deposits in seismic areas. This article presents results from an experimental study of these characteristics for such soils containing 0 to 100% non-plastic silt. Pore pressure generation characteristics are studied using undrained cyclic triaxial tests. Pre- and post-liquefaction compressibility and coefficient of consolidation, and post-liquefaction volumetric densification characteristics are determined from consolidation data prior to cyclic tests and pore pressure dissipation tests following undrained cyclic tests. Effects of fines content on these characteristics compared to those of clean sands are examined in the context of intergranular void ratio and intergranular contact density concepts.