重塑膨胀土三轴增湿变形及力学特性的试验研究  

Experimental study on the moistening deformation and mechanic property of expansive soil

作　　者：吴志刚[1] 张翔[1] 

机构地区：[1]四川建筑职业技术学院,四川德阳618000

出　　处：《四川建筑科学研究》2014年第1期160-163,共4页Sichuan Building Science

摘　　要：通过三轴增湿变形试验和直接剪切试验,对膨胀土的变形和抗剪强度规律进行了研究。结果表明,膨胀土的极限剪应力、凝聚力和内摩擦角都随着含水率的增大而减小,试样含水率越接近饱和含水率,试样的抗剪强度减小的越快;膨胀土的应力随应变增加呈衰减趋势,并且在增湿变形中以体积变形为主,轴向变形较小;在同一应力状态下,随着含水率的增大,体应变逐渐减小,土样表现为膨胀,在含水率相同的条件下,应力越小,膨胀土在浸水过程中的体积变化就越大。The deformation and strength characteristics of expansive soil under the condition of wetted are experimentally studied by triaxial compression and direct shear test. The study result shows that the ultimate shear stress, cohesion and internal friction angles are decreases along with the broadening of water content in the expansive soil. The water content is closer the saturated water content, the shearing strength reduces quickly; and, whereas, a descending tendency of stress-strain curve happen in the process of wetting which shows the volume deformation is more than the shear deformation. The volume deformation is decreases as the water content increases under the identical stress condition, the soil sample presents expanding. The stress is smaller, the volume deformation of expansive soil is bigger along with the broadening of water content.

关 键 词：膨胀土 抗剪强度 增湿变形 含水率 

分 类 号：TU443[建筑科学—岩土工程]