橡胶粉对重塑黄土动力特性影响的试验  

Test on influence of rubber powder on dynamic mechanic properties of manipulated loess

作　　者：胡志平[1,2] 刘卓华[1] 张志权[1,2] 许婧伟[1] 严小宝[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]长安大学地下结构与工程研究所,陕西西安710061

出　　处：《长安大学学报（自然科学版）》2013年第4期62-67,共6页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(41072221);中央高校基本科研业务费专项资金项目(CHD2010ZD002)

摘　　要：将橡胶粉干质量百分比分别设定为6%、9%和15%这3种配合比,重塑橡胶粉-黄土混合土试样,采用动三轴试验系统对橡胶粉-黄土混合土试样进行了不固结不排水三轴剪切试验,研究了橡胶粉对重塑黄土动力特性的影响规律。试验结果表明:混合土动弹性模量随橡胶粉含量的增加而逐渐降低,混合土的最大动弹性模量Edmax与最大动剪切模量Gdmax随橡胶粉含量的增加而明显降低;当动剪应变γd在0～0.002范围内时,橡胶粉含量对动剪切模量比Gd/Gdmax影响不大,当动剪应变γd大于0.002时,混合土的Gd/Gdmax随着橡胶粉含量的增加而增大;动剪应变γd在0～0.01范围内时,阻尼比变化幅度很大,当动剪应变γd大于0.01后,阻尼比趋于稳定;混合土最大阻尼比随橡胶颗粒含量的增加而增大。Manipulated loess and rubber powder was mixed with percentage ot rubber powaer as 6%, 9% and 15% respectively. Triaxial shear test on manipulated loess sample was conducted by dynamic triaxial test system under unconsolidated and undrained condition, and the influence of rubber powder on the dynamic mechanic properties was studied. The results show that the dy-namic modulus （Ed） of manipulated loess decreases with the increment of rubber powder percent age, and the maximum dynamic modulus （Edmax） and dynamic shear modulus （Gdmax） decrease sig-nificantly with the increment of rubber powder percentage. The influence of rubber powder per centage on the dynamic shear modulus ratio （Gd/Gdmax） is not obvious when the dynamic shear strain （γd） is in the range of 0 and 0. 002 but the dynamic shear modulus ratio （Gd/Gdmax） increa-ses with the increment of rubber powder percentage when the dynamic shear strain （γd） exceeds 0. 002. When the dynamic shear strain （γd） is in the range of 0 and 0. 001, the damping ration changes significantly. When the dynamic shear strain （γd） exceeds 0.01, the damping ratio tends to be steady and the maximum damping ratio of manipulated loess increases with the increment of rubber powder percentage. 5 tabs, 6 figs, 15 refs.

关 键 词：土木工程 橡胶粉 重塑黄土 动三轴试验 动力特性 

分 类 号：TU435[建筑科学—岩土工程]