基于BOTDA的土工格栅加筋膨胀土湿胀干缩特性试验  

Test of Swell-Shrinkage Performance of Geogrid Reinforced Expansive Soil Using BOTDA

作　　者：徐洪钟[1] 刘阳[1] 孙义杰[1] 

机构地区：[1]南京工业大学交通学院,南京210009

出　　处：《地下空间与工程学报》2016年第4期1077-1081,共5页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(41072217);江苏省"青蓝工程";江苏省自然科学基金(BK20160997)

摘　　要：为了研究土工格栅加筋膨胀土湿胀干缩特性,制作了玄武岩纤维土工格栅加筋膨胀土和素膨胀土矩形槽试样,将传感光纤布设在土工格栅上和土层中,进行了湿胀干缩试验,利用布里渊光时域分析仪(BOTDA),得到素膨胀土和土工格栅加筋膨胀土试样在湿胀干缩过程中的光栅应变,对比分析两种土样应变分布特征。试验结果表明:在膨胀土湿胀干缩过程中,随着含水率的变化,加筋膨胀土平均应变变化量和变形小于未加筋膨胀土,反映了土工格栅对膨胀土体变形的约束作用和抑制裂隙发展的效果。In order to study the swell-shrinkage performance of geogrid reinforced expansive soil,the samples of expansive soil and reinforced expansive soil are made and sensing fibers are embedded into the soil. Test of swellshrinkage performance is carried out. The strain of samples is obtained by the Brillouin Optical Time Domain Analysis（ BOTDA） during the swell-shrinkage process of expansive soil and reinforced expansive soil. The results show that the reinforced expansive soil strain are less than that of expansive soil with the changes of moisture content during the swell-shrinkage process.The geogrid is useful to restrain the deformation and cracking of soil.

关 键 词：膨胀土 土工格栅 湿胀干缩 BOTDA 应变 

分 类 号：TU443[建筑科学—岩土工程]