岩土力学Issue(2)：423-429,7.DOI:10.16285/j.rsm.2015.02.017
颗粒级配对粒状材料不排水力学特性的影响
Influence of grain gradation on undrained mechanical behavior of granular materials
摘要
Abstract
This paper studies the influence of grain gradation on the undrained mechanical behavior of granular materials. A series of conventional undrained triaxial compression tests is carried out on two different materials (glass balls and Hostun sand), which have high degree of shape self-similarity. For each material, 6 samples with similar relative density and different gradations (Cu=1.1-20) are prepared, and then the samples are sheared. Test results show that the grain gradation has an obvious impact on the undrained mechanical behavior of granular material: both deviatoric stress level and undrained shear strength of two material samples decreases as the coefficient of uniformity (Cu) of the material increases, their variations tend to converge as coefficient of uniformityuC surpasses 5. Based on the evolution of the value of the second-order work of the granular assembly during undrained triaxial loading, potential instability for the selected granular materials is also analyzed. The results demonstrate a significant influence of the grain gradation on stability: the higher of coefficient of uniformity (Cu), the larger of the potential of static liquefaction and the unstabler of materials.关键词
颗粒级配/三轴不排水试验/不稳定性/相对密实度/粒状材料Key words
grain gradation/undrained triaxial test/instability/relative density/granular material分类
建筑与水利引用本文复制引用
刘映晶,李罡,尹振宇,夏小和,王建华..颗粒级配对粒状材料不排水力学特性的影响[J].岩土力学,2015,(2):423-429,7.基金项目
国家自然科学基金（No.41240024，No.41172251，No.41372285，No.51161130523，No.41002095，No.41272317）；欧盟玛丽居里行动计划（No. PIAPP-GA-2011-286397）；高等学校博士学科点专项科研基金（No.20110073120012）；上海市浦江人才计划项目（No.11PJ1405700）。 （）
