考虑埋深影响的长江下游江苏地区粘性土动剪切模量与阻尼比试验研究  

Experimental Study on Dynamic Shear Modulus and Damping Ratio for Cohesive Soil in the Downstream of the Yangze River in the Jiangsu Area Considering the Influence of Embedment Depth

作　　者：付惠姣 谭慧明[1,3] 高志兵[4] 

机构地区：[1]河海大学海岸灾害及防护教育部重点实验室,江苏南京210098 [2]上海宏波工程咨询管理有限公司,上海201700 [3]河海大学港口海岸与近海工程学院,江苏南京210098 [4]江苏省地震工程研究院,江苏南京210014

出　　处：《防灾减灾工程学报》2016年第6期872-877,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51309087);高等学校博士学科点专项科研基金项目(20130094120019)资助

摘　　要：动剪切模量和阻尼比是场地地震反应分析中两个重要的土动力学参数。本文以江苏地区为例,统计了375个粘性土的最大剪切模量、动剪切模量比和阻尼比,包括粘土、淤泥质土、粉质粘土、粉土,考虑土的类型以及埋藏深度的影响,对各类土的最大剪切模量与土样埋深的关系以及不同深度区间内动剪切模量比和阻尼比与剪应变的关系行了详细的研究。结果表明:各类土的最大剪切模量均随埋深的增大而增大,两者在统计意义上呈指数关系;埋深对粘性土的动剪切模量比和阻尼比与剪应变的关系曲线有较明显的影响,且这种影响程度随埋深的增大而减小。同时给出了各类土动剪切模量与埋深关系的拟合公式以及在不同埋深区间内动剪切模量比和阻尼比与剪应变关系曲线的拟合参数,在实际工程中有一定的参考价值。Dynamic shear modulus and damping ratio are two important soil dynamic parameters.They are indispensable basic data for seismic response analysis of important projects.375 cohesive soil samples in Jiangsu area including clay,mucky soil,silty clay,silt,and fine sand interbedded strata are presented in the paper.Considering the effect of soil type and embedment depth,the relationship between the maximum shear modulus and embedment depth and the relationships of dynamic shear modulus ratio and damping ratio with shear strain in different embedment depth of each kind of soil are analyzed in detail.The result shows that the maximum shear modulus of each kind of soil increases with the increase of embedment depth.They follow the exponential function.The effect of embedment depth on the relationships of dynamic shear modulus ratio and damping ratio with shear strain of cohesive soil is obvious and the degree of influence decreases with the increase of embedment depth.The fitting formulas for the relationship between maximum shear modulus and embedment depth and the fitting parameters for the relationships of dynamic shear modulus ratio and damping ratio with shear strain in different depth interval of each kind of soil are also given,which provide a reference for practical projects.

关 键 词：粘性土 动剪切模量 阻尼比 土样埋深 

分 类 号：TU435[建筑科学—岩土工程] P315[建筑科学—土工工程]