摘要
对南阳膨胀土分别进行了有荷载与无荷载两种情况下不同循环次数的变形与强度特性试验,同时进行了将膨胀土装入编织袋而形成的土工袋的平行试验。结果表明:膨胀土在干湿循环过程中的胀缩变形过程不完全可逆,其绝对胀缩率峰值随干湿循环次数的增加而逐渐减小;膨胀土的抗剪强度指标c值随循环次数的增加逐渐减小,φ值变化不大;土工袋有抑制膨胀土胀缩变形的作用,其抗压强度值随循环次数的增加而逐渐减小。
Laboratory experiments are carried out on a Nanyang expansive soil to investigate its characteristics of the deformation and strength under different repeated drying-wetting cycles when an external load is applied on the samples or not. The parallel experiments are also carried out on the soilbags （filling the expansive soil into woven plastic bags）. The results show that the swelling-shrinking deformation of the tested expensive soil is not completely reversible during the drying-wetting process and the peak swelling-shrinking deformation decreases gradually with the increasing drying-wetting cycles; the shear strength of the tested expansive soil decreases gradually with the increasing drying-wetting cycles, in which the cohesion c decreases whereas the internal friction angle changes slightly. Soilbags can restrain the swellingshrinking deformation of ex pensive soils, and their compressive strengths gradually decrease with the increasing drying-wetting cycles.
出处
《南水北调与水利科技》
CAS
CSCD
2009年第4期20-24,共5页
South-to-North Water Transfers and Water Science & Technology
基金
"十一五"国家科技支撑计划项目(2006BAB04A10)
关键词
膨胀土
干湿循环
土工袋
强度
变形
expansive soil
drying-wetting cycle
soilbag
strength
deformation
