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膨胀土是一种在世界范围内分布广泛的非饱和特殊土,具有吸水膨胀、失水收缩和反复胀缩的特性,被工程界称为灾害土.以南水北调中线工程南阳陶岔引水渠坡重塑膨胀土为研究对象,针对膨胀土裂隙性的结构特征,通过CT-三轴排水剪切试验,研究具有不同初始损伤程度和不同损伤位置的膨胀土试样结构演化情况及其力学特性.研究发现:轴向应变与偏应变之间成线性正比例关系,相同吸力不同围压时,围压越大,体应变最大值越大;相同围压不同吸力时,吸力越大,体应变达到最大值所用时间越短.研究结论可以为分析膨胀土变形、强度和稳定性问题提供科学依据,对保障膨胀土地区工程建设的顺利进行有重要的意义.
Expansive soil is a kind of special unsaturated soil distributed widely in the world, with the characteristics of water swelling, water loss shrinkage and repeated expansion and contraction, which are called as disaster soil by the engineering field. Plastic expansive soil as the research object, according to the structural characteristics of expansive soil fissures, the evolution and mechanical properties of expansive soil samples with different degrees of initial damage and different damage locations were studied by CT-triaxial drainage shear test. It is found that there is a linear and proportional relationship between the axial strain and the deviatoric strain. When the confining pressure is different with the same suction, the bigger the confining pressure is, the bigger the value of the body strain is. When the same confining pressure is different, the bigger the suction force is, The shorter time it takes.Research conclusions can provide a scientific basis for analyzing the deformation, strength and stability of expansive soils, which is of great significance to the smooth progress of construction of expansive soils.