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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 swelling and shrinkage characteristics of geotextile-reinforced expansive soils, basalt fiber geogrid reinforced expansive soils and rectangular samples of plain expansive soils were fabricated. The sensing fibers were laid on the geogrid and soil, The wetting and drying shrinkage tests were carried out. The grating strain of the expansive soil and geogrid-reinforced expansive soil specimens during wet-drying and shrinking was obtained by using Brillouin optical time-domain analyzer (BOTDA) Strain distribution characteristics of soil samples. The experimental results show that the average strain change and deformation of the reinforced expansive soil are smaller than that of the non-reinforced expansive soil as the moisture content changes during the swelling and shrinkage of the expansive soil, which reflects the constraint of the geogrid on the deformation of the expansive soil Effect and inhibit the development of cracks.