基于平面应变试验的非饱和膨胀土强度分析  

Analysis of shear strength of unsaturated expensive soil under plane strain test

作　　者：安骏勇[1] 蒋刚[2] 王钊[3] 

机构地区：[1]中国科学院武汉岩土力学研究所,武汉430071 [2]南京工业大学土木工程学院,南京210009 [3]武汉大学土木建筑学院,武汉430072

出　　处：《岩土力学》2007年第12期2649-2651,2656,共4页Rock and Soil Mechanics

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.

关 键 词：非饱和土强度 吸力 平面应变 吸力内摩擦角φ^b 

分 类 号：TU413.5[建筑科学—岩土工程]