循环荷载作用下非饱和击实粉土变形特性的试验研究

采用GDS非饱和土三轴仪,对循环荷载作用下的非饱和击实粉土样进行了控制吸力三轴排水剪切试验,研究了吸力、围压和动应力幅值对土样的变形特性的影响.试验结果表明:在相同动应力幅值和相同净围压下,吸力的增加提高了土体抵抗动变形的能力;在相同的净围压和吸力下,动应力幅值较小时,土样产生弹性变形且变形最终趋于稳定,动应力幅值较大时,经过一定的循环次数后土样达到破坏;净围压对试样的变形特性影响显著,围压较大时土样有较小的弹性变形,围压较小时土样发生明显的塑性变形.

Deformation Property of Unsaturated Compacted Silts Under Cyclic Loading

Through the cyclic triaxial CD tests of compacted silts under controlled matric suction by using an unsaturated GDS triaxial apparatus,the deformation property analysis was made on the silts under cyclic loading,and the influence of matric suction,net cell pressure and dynamic stress amplitude were taken into consideration.Some conclusions can be made from the research as flowing.(1) Increasing of matric suction advances the soils' capacity of forresisting dynamic deformation under the same net cell pressur...