无泥型软弱层带在动荷载作用下的阻尼特征  

DAMPING PROPERTY OF NO-CLAY WEAK INTERBED UNDER DYNAMIC LOAD

作　　者：胡卸文[1] 

机构地区：[1]西南交通大学土木工程学院,成都610031

出　　处：《工程地质学报》2001年第3期258-262,共5页Journal of Engineering Geology

基　　金：西南交通大学科学研究基金 (项目编号:1999XM 15 )资助

摘　　要：通过对三组含不同粒度成分的无泥型软弱层带室内土动三轴试验 ,表明阻尼比有随动应变增加而增大的趋势 ,但粒度成分和含水状态又对阻尼比产生不同的影响。分析显示 ,以粗碎屑为特征的无泥型软弱层带对地震动荷载的反应程度可初步认为应属于不明显的土 ,即其动力学性质变化 (衰减幅度 )较松散～中等密实的饱和砂土要小。Through analyzing dynamic deformation testing results of no-clay weak interbed belong to different granulometric composition, we show that damping ration(λ d) increase along with dynamic strain(ε d) added. Granulometric composition and moisture content will control the damping ration.Testing results show that dynamic effect by earthquake is no evident for no-clay (coarse clastic soil) weak interbed. The dynamic mechanical property of no-clay weak interbed is better than saturated sand soil of raveling and middle density.

关 键 词：无泥型饮弱层带 动荷载 阻尼比 室内土动三轴试验 粒度 应变 

分 类 号：TU411.8[建筑科学—岩土工程] TU411.7[建筑科学—土工工程]