摘要
利用非饱和土三轴仪,对合肥地区非饱和黏性土的重塑样进行了控制基质吸力的三轴剪切试验。研究结果表明,控制吸力和净围压为常数的重塑非饱和黏性土三轴排水剪切试验的应力-应变关系呈现应变硬化的力学特征,且在试验条件范围内,净围压越大,硬化特征越强,吸力越小,硬化特征越强;重塑土样的强度参数粘聚力c值和内摩擦角φ值随吸力的增加都有一定程度的增加,且在试验吸力范围内,c值和φ值均呈良好的线性增长趋势,且c值的增长幅度明显大于φ值。
Using the unsaturated soil triaxial apparatus, the triaxial shear tests were done for unsaturated soil of the Hefei area under the condition of controlling matric suction. The results showed that, the stress-strain relationship exhibited mechanical characteristics of strain hardening, with the condition of suction controlling and net confining pressure to be constant. Under the test condition, the greater the net confining pressure, the smaller the suction and the stronger the hardening characteristics would be. The cohesion c and inner angle of friction φ of the remolded soil increased with the increasing of the suction at certain extent, but the c value and φ value increased linearly, the growth rate of c value was higher than φ at the scope of the test suction.
出处
《地下空间与工程学报》
CSCD
北大核心
2014年第2期290-294,共5页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金项目(41172261)
四川省科技支撑计划项目(2011SZ0178)
关键词
非饱和土
强度特性
三轴试验
unsaturated soil
strength characteristics
triaxial test
