土工格栅加筋土直剪摩擦试验研究  

Study on direct shear friction test of geogrid reinforced soil

作　　者：邹玉娜[1] 时伟[1] 

机构地区：[1]青岛理工大学土木工程学院,青岛266033

出　　处：《青岛理工大学学报》2013年第3期11-16,45,共7页Journal of Qingdao University of Technology

基　　金：青岛市科技计划基础研究项目(12-1-4-4-(4)-jch)

摘　　要：通过直剪摩擦试验方法,对不同含水量的土工格栅粉煤灰加筋土和土工格栅二灰加筋土进行试验,得到不同填料土工格栅加筋土在不同法向应力作用下的抗剪强度,由此得到土工格栅加筋土界面相互作用特性指标:似摩擦系数和界面摩擦角.试验结果表明:土工格栅粉煤灰加筋土试验,当含水量由10%增大到18%时,随着含水量的增大,土工格栅粉煤灰加筋土的似摩擦系数和界面摩擦角逐渐增大,当含水量由18%增大到25%时,土工格栅粉煤灰加筋土的似摩擦系数和界面摩擦角逐渐减小;当含水量由25%增大到36.4%时,似摩擦系数和界面摩擦角逐渐增大,而且增加幅度明显提高.通过击实试验得到土工格栅二灰加筋土的最优含水量,并对土工格栅最优含水量二灰加筋土进行试验,得到的似摩擦系数和界面摩擦角均大于土工格栅粉煤灰加筋土指标.By direct shear friction test of geogird fly ash reinforced soil with different moisture content and geogird lime-fly ash reinforced soil,shear strength of geogrid reinforced soil with different filler in a different normal stress is got,and the interfacial interactions characteristic indicators of geogrid reinforced soil is then calculated： similar friction coefficient and interface friction angle.What the results show is that in the test of geogrid fly ash reinforced soil,when fly ash moisture content increases from 10% to 18%,with the moisture content increase,similar friction coefficient and interface friction angle are increased;when fly ash moisture content increases from 18% to 25%,similar friction coefficient and interface friction angle are decreased;when fly ash moisture content increases from 25% to 36.4%,similar friction coefficient and interface friction angle are significantly increased.By compaction test,optimum moisture content of lime-fly ash is obtained,and by direct shear friction test,similar friction coefficient and interface friction angle become bigger than indicators of geogrid fly ash reinforced soil.

关 键 词：直剪摩擦试验 土工格栅 粉煤灰 二灰土 界面摩擦特性 

分 类 号：TU472.34[建筑科学—结构工程]