基于应力路径的吸力对非饱和土性能参数的影响  

Effects of suction based on stress path on property parameters of unsaturated soils

作　　者：邢国起[1,2] 肖洪天[1] 李大勇[1] 

机构地区：[1]山东科技大学山东省岩土与结构工程重点实验室,山东青岛266590 [2]潍坊学院建筑工程学院,山东潍坊261061

出　　处：《南水北调与水利科技》2016年第3期90-94,共5页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金资助项目(51379118)~~

摘　　要：以非饱和重塑粉土为研究对象,应用GDS非饱和土三轴仪进行三种应力路径试验,基于平均有效应力和平均净应力研究了吸力对试样性能参数的影响规律。研究结果表明:三轴等向压缩试验中基于平均有效应力得到的非饱和试样的先期固结压力随吸力增大而增大,而基于平均净应力得到的先期固结压力的变化规律则不明显。三轴不排水剪切试验中基于平均有效应力得到的临界状态线与吸力无关且唯一,基于平均净应力得到的临界状态线与饱和试样临界状态线平行,且随吸力增大临界状态线逐渐远离饱和试样的临界状态线。The effects of suction on mechanical property of unsaturated remolding silt were investigated based on mean effective pressure and mean net pressure according to three kinds of stress paths with GDS apparatus.The results showed that preconsolidation pressure increased with suction based on mean effective pressure,and it was not obvious based on mean net pressure for isotropic compression test.The critical state line of unsaturated soils was not related to suction and was unique based on mean effective pressure,and it was paralleled to the critical state line of saturated soils and far away with suction increasing based on mean net pressure in undrained shear test.

关 键 词：应力路径 吸力 非饱和重塑粉土 平均有效应力 平均净应力 

分 类 号：TU43[建筑科学—岩土工程]