邯郸与太原两地粉土动力特性的试验研究  

CYCLICAL TRI-AXIAL TESTS FOR DYNAMIC MODULUS CHARACTERISTICS OF SILTY SOILS AT SIX SITES IN HANDAN AND TAIYUAN

作　　者：高博[1] 张鸿儒[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《工程地质学报》2008年第4期502-506,共5页Journal of Engineering Geology

基　　金：建设部攻关项目(编号:01-2-01)

摘　　要：对邯郸5个工程场区和太原1个工程场区的粉土进行了循环荷载幅值为不规则变化的动模量试验。试验研究发现,粉土的动模量衰减的比砂土慢;其动模量衰减到最大动模量的85%时,开始表现出塑性特征,因此,在动模量衰减到最大动模量的85%之前降低循环动荷载的幅值,动模量仍能大部分回到初始值。粘粒含量的变化使粘粒在粉土中表现出不同的作用,当粘粒含量小于10%时,动强度随粘粒含量的增加而降低;当粘粒含量大于10%后,动强度随粘粒含量的增加而增加。The dynamic modulus tests of cyclical tri - axial loading with increasing and decreasing amplitudes were carried out for silty soils from one site in Taiyuan city and five sites in Handan city. The test results show that the speed of decrease in the dynamic modulus with the increase of the shear strain for the silty soils from different sites was slower, compared with sandy soil. The plastic threshold is found to be equal to 85% of Emax . So the amplitudes of cyclical loading were reduced just before the dynamic modulus gets to 85% Emax. As a result, the dynamic modulus would mostly return to the initial value. Variations of the clay contents have different functions. The dynamic strength of silty soils at their original conditions decreases with the increase of clay contents when the clay content is less than 10%. The dynamic strength of silty soil at their original conditions increases with the increase of clay contents when the clay content is more than 10%. Key words Silty soil, Dynamic modulus, Cyclical triaxial test, Clay content, Dynamic soil mechanics, Taiyuan, Handan

关 键 词：粉土 动模量 动三轴仪 粘粒含量 

分 类 号：P642.13[天文地球—工程地质学]