岩土工程学报2012，Vol.34Issue(4)：582-590,9.
饱和南京细砂动剪切模量特性的大型振动台试验研究
Dynamic shear modulus of saturated Nanjing fine sand in large scale shaking table tests
摘要
Abstract
In order to investigate the dynamic shear modulus of saturated sand during the increasing and dissipating stages of dynamic pore water pressure （PWP）, large-scale shaking table tests on saturated Nanjing fine sand are carried out. Based on test data, the significance of reasonable choice of the threshold values of low and high frequencies with band-pass filter is analyzed to obtain the displacement from acceleration by double integration. Moreover, an approach to obtain the dynamic shear modulus from the acceleration time-history relationship is established. By analyzing the relationships among the dynamic shear modulus ratio, the cycle number of loading, the PWP ratio and the shear strain amplitudes during the increasing and dissipating stages of PWP, the following results are obtained： （1） since the dynamic shear modulus during the dissipating stage of PWP is significantly smaller than that during the increasing stage, it is unreasonable to take the dynamic shear modulus during the two stages as the same; （2） the decay rate of dynamic shear modulus with the increase of the shear strain amplitude obtained from large-scale shaking table tests for saturated Nanjing fine sand is faster than that obtained from cyclic triaxial tests, in laboratory.关键词
大型振动台试验/饱和南京细砂/动剪切模量/孔压消散/二次积分Key words
large-scale shaking table test/saturated Nanjing fine sand/dynamic shear modulus/dissipation of pore water pressure/double integration分类
建筑与水利引用本文复制引用
陈国兴,王炳辉,孙田..饱和南京细砂动剪切模量特性的大型振动台试验研究[J].岩土工程学报,2012,34(4):582-590,9.基金项目
国家自然科学基金项目 （）
国家重点基础研究发展计划项目 （）
江苏省高校自然科学熏大基础研究资助项目 （）
