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通过泥浆固结法制备大量均一试样,基于改进的可控制吸力式非饱和土C.K.C循环三轴仪进行了动三轴试验,研究了非饱和粉质粘土在交通荷载长期作用下的动强度和变形特性,同时分析了在饱和条件下反复干湿循环对其动强度的影响。结果表明:基质吸力的增加提高了土体抵抗变形的能力,相同动应力及振次条件下,土体的累积塑性应变随着基质吸力的增加而减小;土体的临界循环动应力以及动强度随着基质吸力的增加而增大,但动强度随基质吸力增加而增大的速率随基质吸力的增加而减小;干湿循环对粉质粘土的动强度有显著影响,使得土体的动强度提高。
A large number of uniform samples were prepared by slurry consolidation method. The dynamic triaxial tests were carried out based on the improved CKC cyclic triaxial apparatus with controlled suction unsaturated soil. The dynamic strength and mechanical properties of unsaturated silty clay under long-term traffic load were studied. Deformation characteristics are analyzed. At the same time, the effect of repeated wet-dry cycles on the dynamic strength under saturated conditions is analyzed. The results show that the increase of matrix suction increases the ability of soil to resist deformation. Under the same dynamic stress and vibration condition, the cumulative plastic strain of soil decreases with the increase of matrix suction. The critical cyclic dynamic stress of soil and dynamic The strength increases with the increase of substrate suction, but the rate of increase of dynamic strength decreases with the increase of substrate suction. The wetting and drying cycles have a significant effect on the dynamic strength of silty clay, Dynamic strength increased.