摘要
通过对不同含水率下的原状非饱和黄土进行不同围压的固结不排水不排气非饱和三轴试验,研究了含水率、围压对原状非饱和黄土的强度和基质吸力的影响规律。结果表明:当含水率较低(如3.3%)时,随着围压的增大,非饱和黄土的强度逐渐增大,非饱和黄土也逐渐由应变软化型材料转变成弱应变硬化型材料;当含水率较高(如≥6.9%)时,即使在较低的围压下,非饱和黄土也表现为弱应变硬化型材料;固结过程中基质吸力随含水率的增大而减小,并在含水率超过约18%后迅速降低。
Through consolidated unventilated-undrained triaxial test of undisturbed unsaturated loess under differ-ent water contents and different confining pressures, the influence law of water content and confining pressure onstrength and matrix suction of undisturbed unsaturated loess is studied. Test results show that strength of unsatu-rated loess increases and unsaturated loess changes from strain softening materials into weak strain hardening mate-rial gradually with the increase of confining pressure when the water content is low（e, g. 3.3 %）. Even on conditionof low confining pressures unsaturated loess are also characterized as weak strain hardening material when the wa-ter content is high（e, g≥6.9 %）. In the process of consolidation matrix suction reduces with the increase of watercontent,and declines rapidly when the water content is beyond 18%.
出处
《甘肃科学学报》
2015年第4期101-104,共4页
Journal of Gansu Sciences
关键词
非饱和黄土
含水率
基质吸力
非饱和三轴试验
Unsaturated loess
Water content
Matrix suction
Unsaturated triaxial test
