岩土力学2017，Vol.38Issue(12)：3627-3634,8.DOI:10.16285/j.rsm.2017.12.030
昆明泥炭质土动剪切模量与阻尼比的试验研究
Experimental study of dynamic shear modulus and damping ratio of peaty soil in Kunming
摘要
Abstract
Dynamic properties of peaty soils from Kunming basin are investigated through a series of undrained cyclic triaxial testing.The effects of confining pressure,consolidation ratio,and loading frequency on the maximal shear modulus Gmax,dynamic shear modulus Gd,normalized shear modulus Gd/Gmax,and damping ratio λ are analyzed.Test results indicate that Gmax of Kunming peaty soil increases linearly with increasing confining pressure and consolidation ratio.Gd decreases as well as λ increases with increasing shear strain amplitude γd.When shear strain amplitude is small,Gd and λ change slightly.As shear strain increases to a certain degree,they change rapidly.Gd/Gmax is weakly influenced by confining pressure,consolidation ratio and loading frequency,the damping behavior is significantly influenced by confining pressure and loading frequency and is weakly influenced by consolidation ratio.A regression model considering confining pressure and consolidation ratio is developed.Meanwhile,the relations are provided for Gd/Gmax and 2 versus γd by using the Davidenkov model.The results show that the fitting models can describe the variation for peaty soil well.The difference of dynamic shear modulus and damping ratio characteristics for peaty soils in other regions and different soils is analyzed as well.关键词
泥炭质土/动剪切模量/阻尼比/动三轴试验Key words
peaty soil/dynamic shear modulus/damping ratio/cyclic triaxial test分类
建筑与水利引用本文复制引用
丁祖德,黄娟,袁铁映,彭立敏,王志良..昆明泥炭质土动剪切模量与阻尼比的试验研究[J].岩土力学,2017,38(12):3627-3634,8.基金项目
国家自然科学基金(No.51768028,No.51308270,No.51408284) （No.51768028,No.51308270,No.51408284）
云南省应用基础研究计划项目(No.2013FB015) （No.2013FB015）
国家重点基础研究发展计划项目(973计划)(No.2011CB013802).This work was supported by the National Natural Science of China (51768028,51308270,51408284),the Applied Basic Research Foundation of Yunnan Province of China (2013FB015) and the National Program on Key Basic Research Project of China (973 Program) (2011CB013802) （973计划）
