围压对黏土动力特性影响的试验研究  

EXPERIMENTAL RESEARCH ON INFLUENCE OF CONFINING STRESS ON DYNAMIC CHARACTERISTICS OF THE CLAY

作　　者：赵科[1] 饶锡保[1] 张婷[1] 何晓民[1] 王占彬[1] 

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,武汉430010

出　　处：《工业建筑》2013年第S1期572-575,共4页Industrial Construction

摘　　要：以某工程场地黏土为研究对象,结合工程实际,考虑不同固结围压对黏土动力特性的影响。通过循环振动三轴试验,对黏土在选定的5组固结围压状态下表现出来的动力特性进行研究,得出固结围压的变化对其产生的影响。在研究的固结围压范围内,固结围压对黏土最大动剪模量的影响显著,随围压的增大呈幂指数增长;对动剪模量比曲线与阻尼比曲线的影响均较小,简化起见,将其分别作归一化处理。数据处理过程中引入Darendeli M B等的研究成果,对试验成果进行统计回归分析,得到Gd/Gdmax-γd关系曲线的归一化表达式,间接得到了λd-γd归一化表达式。Based on the actual situation of engineering,the clay of one engineering site is studied,the influences of different confining stress are considered.Through dynamic triaxial test,dynamic characteristics of the clay under 5 selected confining stresses are studied;the impacts of confining stresses on it are concluded.In the range of analyzed confining stress,the influce of the maximum dynamic shear modulus is very significant,and it is the exponential growth with the increase in confining stress;the influence of dynamic shear modulus ratio and damping ratio is small,for simplicity,respectively for the normalization process.The research results of M.B.Darendeli were introduced into data processing,the Gd/ Gdmax-γdnormalized expression was received with statistical regression analysis of the test results,and the λd-γdnormalized expression was also received indirectly.The data would be great valuable to engineering practices.

关 键 词：黏土 固结围压 动三轴 最大动剪模量 动剪模量比 阻尼比 

分 类 号：TU411[建筑科学—岩土工程]