p-s平面上不同应力路径的非饱和土力学特性研究  

STUDY OF MECHANICS CHARACTERISTIC OF UNSATURATED SOILS WITH DIFFERENT STRESS PATHS ON P-S PLANE

作　　者：苗强强[1] 陈正汉[1] 朱青青[2] 

机构地区：[1]后勤工程学院建筑工程系,重庆401331 [2]西北民族大学化工学院,甘肃兰州730000

出　　处：《岩石力学与工程学报》2011年第7期1496-1501,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(10902091);后勤工程学院2008年研究生创新专项基金资助项目

摘　　要：通过7个吸力和净平均应力同时变化的非饱和含黏砂土固结试验,研究7条不同应力路径的试验在p-s-v,p-s-εv,p-s-εw和p-s-w空间曲线形状随角度α(净平均应力和吸力夹角)的变化规律,分析引起变化的机制,指出净平均应力是决定体变的重要因素,吸力是决定水分变化的首要条件。并探讨p-s平面上7条应力路径屈服点连线轨迹的统一表达式,建立p-s平面上屈服点连线的统一抛物线表达式。最后运用该公式预测已有的试验数据,预测结果较为理想,说明该式预测p-s平面上不同应力路径各屈服点变化规律是较为可靠的。Through 7 clayey sand consolidation tests of suction and net mean stress both changing,the variation laws of 7 stress paths were studied in the p-s-v,p-s-,p-s-and p-s-w spaces with the variation between suction and net mean stress included angle.Where p is net mean stress;s is suction;v is specific volume;is volume deformation;is volume deformation in water phase;w is moisture content;is angle.The test results indicate that net mean stress is a very important factors to the volume deformation;the suction is the first conditions to the moisture changing.The yielding point locus is studied and given a unifying parabola expression in the p-s plane.Finally,using the predecessor test data forecasted yielding point locus laws in the p-s plane that proved the unifying parabola expression is credible.

关 键 词：土力学 应力路径 非饱和土 吸力 净平均应力 

分 类 号：TU443[建筑科学—岩土工程]