摘要
介绍了非饱和土强度理论的研究现状,总结了FREDLUND提出的吸力内摩擦角Φb的性质与规律研究,根据FREDLUND非饱和土强度理论和吸力内摩擦角Φb的计算方法,利用原状膨胀土的平面应变等应力比卸荷试验,分析得到土样破坏时应力状态下得到的吸力内摩擦角Φb>Φ′,与FREDLUND提出的吸力内摩擦角Φb的变化规律不一致,分析认为,是由于卸荷试验过程导致微裂隙的张开,引起基质吸力的降低,有待于继续深入研究。
The state-of-art of unsaturated soils strength and the angle of internal friction φ^b with matric suction indicated by Fredlund are introduced; and the law of φ^bis analyzed. With the test results of plane strain constant stress ratio-unloading of undisturbed expansive soils, the angle of internal friction φ^bwith matric suction calculated by Fredlund's method is great than the effective angle of internal friction φ^b. The result is not accord with Fredlund's theory; the reason is that micro- crannies were puffed during unloading test so sa to reduce the matric suction. More experiments analysis must be taken.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第12期2649-2651,2656,共4页
Rock and Soil Mechanics
关键词
非饱和土强度
吸力
平面应变
吸力内摩擦角φ^b
unsaturated soils strength
matric suction
plane strain
angle of internal friction φ^b with matric suction