中文摘要：

通过掺入玄武岩纤维对膨胀土进行改良，采用快剪试验、收缩试验得到了加筋膨胀土的直剪强度参数和收缩变形特征．研制了矩形制样器，通过分层压实的方法将传感光栅串埋入土体中，采用光纤光栅传感技术（FBG），分别得到了素膨胀土和纤维加筋膨胀土试样在干缩过程中的光栅应变，对比了2种试样干缩变形的空间分布特征及其发展规律．试验结果表明，通过掺入一定量的玄武岩纤维，可以在一定程度上提高膨胀土的强度参数，使膨胀土的收缩系数显著下降，较大改善了膨胀土收缩过程中土体内部应变分布不均匀的状态，对膨胀土裂隙的产生具有显著的抑制效果．

英文摘要：

With the incorporation of basalt fiber, the expansive soil can be reinforced. By using quick direct sheafing test and shrinkage test, shear strength parameters and shrinkage characteristics of the reinforced expansive soil are obtained. A steel cuboid vessel is designed to make strip samples for further shrinkage test with fiber Bragg grating （FBG） sensing technology. Through the hierarchi- cal compaction with oil jack, sensing fibers with FBG sensors are embedded into the soil. The strain of the FBG sensors is obtained during the dehydration process of expansive soil and reinforced expan- sive soil. The temporal and spatial distribution of the soil shrinkage deformation is investigated. The results show that adding a proper amount of basalt fibers into the expansive soil is helpful to increase the strength parameters, reduce the contraction coefficient, average the strain state of the soil and restrain its cracking effectively.