青岛第四纪冲洪积粉质黏土的动力特性研究  

Research on dynamic characteristics of Qingdao quaternary alluvial proluvial silty clay

作　　者：隋学斌[1] 左红伟[1] 胡晓阳[1] 

机构地区：[1]青岛理工大学土木工程学院,青岛266033

出　　处：《青岛理工大学学报》2015年第4期42-46,共5页Journal of Qingdao University of Technology

摘　　要：通过对青岛城区第四纪冲洪积粉质黏土原状土样进行大量动三轴试验,研究了在不同固结条件下此类粉质黏土的动弹性模量、动剪切模量及阻尼比等一系列的动力特性.试验结果表明:青岛第四纪冲洪积粉质黏土的应力-应变关系符合双曲线模型.土的动弹性模量随动应变的增大而减小,随围压的增大而增大.土的动剪切模量随剪应变的增大而减小.每个模型土的初始动剪切模量G0和最大动剪应力τy与轴向固结应力间均有良好的幂函数关系,且对不同固结状态归一.阻尼比随剪应变的增大而逐渐减小,且当γd接近0.002时趋于稳定,围压和固结比对阻尼比的影响较小.A series of dynamic characteristics such as dynamic elasticty modulus,dynamic shear modulus and damping ratio are studied by dynamic triaxial tests on Qingdao suburbs undisturbed quaternary alluvial proluvial silty clay sample.It is indicated that from test results,Qingdao quaternary alluvial proluvial silty clay stress-strain relationship is in line with hyperbolic model.Dynamic modulus decreases with increasing of dynamic strain,and increases with the increase of confining pressure.Dynamic shear modulus decreases with the increase of shear strain.Power correlations between its two parameters containing the initial dynamic shear modulus and the maximum dynamic shear stress and consolidation axial stress are obtained and normalized under different consolidation stress conditions.Damping ratio decreases with the increase of shear strain.When the shear strain is close to 0.002,damping ratio reaches the minimum value until stability.Consolidation confining pressure and consolidation ratio deserves little effect on damping ratio.

关 键 词：黏土 动三轴试验 动弹性模量 动剪切模量 阻尼比 

分 类 号：U414.1[交通运输工程—道路与铁道工程]