饱和冻土中弹性波的传播特性  

Propagation characteristics of elastic wave in saturated frozen soil

作　　者：周凤玺[1,2] 赖远明[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,兰州730000 [2]兰州理工大学土木工程学院,兰州730050

出　　处：《岩土力学》2011年第9期2669-2674,共6页Rock and Soil Mechanics

基　　金：国家高技术研究发展计划基金资助项目(No.2008AA11Z103);中国科学院西部计划项目(No.KZCX2-XB2-10);中国科学院知识创新工程重大项目(No.408210014);国家自然科学基金资助项目(No.40730736)

摘　　要：应用混合物连续介质理论,考虑了土颗粒骨架、冰、水三相介质,选取土颗粒位移、孔隙水位移、孔隙水压和孔隙冰压为基本变量,采用Bishop有效应力原理,建立了饱和冻土多孔介质的弹性波弥散方程。经理论推导,给出了饱和冻土中弹性波的传播速度及衰减的解析表达式。通过数值算例,探讨了饱和冻土中两种压缩波(Pl波和P2波)及剪切波(S波)的波速和衰减与频率和孔隙率、含冰量等土参数的关系。通过参数分析研究了饱和冻土中3种体波的传播特性。With the application of continuum theory of mixture,which takes the three-phase media,including grains,fluid and ice into account,the dispersion equations of body waves are established for saturated frozen soil by considering Bishop＇s effective stress formula.The equations are described with skeleton displacement,pore water displacement,pore water pressure and pore ice pressure.The analytical expressions of wave velocity and attenuation are deduced.The effects of frequency and the parameters of saturated frozen soils on the velocity and attenuation of three kinds of body waves（P1 wave,P2 wave and S wave,respectively） are investigated by using numerical method.

关 键 词：饱和冻土 混合物 弹性波 传播特性 

分 类 号：TU43[建筑科学—岩土工程] O347.41[建筑科学—土工工程]