重晶石粉和橡胶粉对重塑黄土抗剪强度的影响  

Effect of barite powder and rubber powder on the shear strength of manipulated loess

作　　者：许婧伟[1] 胡志平[1,2] 马胜龙[1] 严小宝[1] 刘卓华[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：《西安科技大学学报》2013年第5期565-570,共6页Journal of Xi’an University of Science and Technology

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资助项目(CHD2010ZD002)

摘　　要：为研究重晶石粉和橡胶粉对重塑黄土抗剪强度的影响,将橡胶粉干质量百分含量分别设定为5%和10%,配制重晶石粉干质量百分含量分别为5%,10%,15%,20%,25%的重塑黄土试样10组,然后将重晶石粉干质量百分含量分别设定为5%,10%,配制橡胶粉干质量百分含量分别为6%,8%,10%,12%,14%,16%的重塑黄土试样12组,分别进行快速直接剪切试验。试验结果表明,重塑混合土粘聚力C随着重晶石粉含量的增加而降低,橡胶粉含量对降低趋势影响不明显,重塑混合土内摩擦角随着重晶石粉含量的增加而增大,且随着重晶石粉含量的增加,内摩擦角增大速率逐渐增加;重塑混合土粘聚力C随着橡胶粉含量的增加而减小,但减少幅度与橡胶粉掺和比不成比例,重塑混合土内摩擦角随着橡胶粉含量的增加近乎呈线性增加。In order to study the influence of barite powder and rubber powder on the shear strength of mixed manipulated loess, firstly, the manipulated soil sample was mixed with loess and rubber powder which is 5% and 10% in mass, with dry mass percent of barite powder as 5% , 10% , 15%, 20% , 25% ,respectively. Then, the manipulated soil sample was mixed with loess and barite powder which is 5% and 10% in mass, with dry mass percent of rubber powder as 6% ,8% , 10% , 12% , 14% , 16% , respectively. In the last, the fast direct shear test of mixed soils sample is tested under unconsolidated and undrained condition, and the influence of barite powder and rubber powder on the shear strength of mixed manipulated loess is studied. Test results prove that, the cohesive force of mixed soil decrease with the increment of barite powder mass percent, and the mass percent of rubber powder is not signifi- cant to the decrement tend of cohesive force of mixed soil. The internal friction angle of mixed soil in- crease with the increment of barite powder mass percent, and the increment gradient of internal friction angle is increase with the increment of barite powder mass percent. The cohesive force of mixed soil de- crease with the increment of rubber powder, but the decrease amplitude is not proportional to the incre- ment of rubber powder percentage. The internal friction angle of mixed soil linearly increase nearly with the increment of rubber powder.

关 键 词：重晶石粉 橡胶粉 重塑黄土 直剪试验 抗剪强度 

分 类 号：TU443[建筑科学—岩土工程]