冻融循环作用对石灰改良黏土侧限回弹模量的影响

Effect of freeze and thaw on confined resilient modulus of improved lime-soil

为研究石灰改良黏土经冻融循环作用后其回弹模量的变化规律,对不同石灰掺量最佳含水量下的土体进行了试验研究。试验结果表明:在掺灰剂量8%以下时,土体随掺灰剂量的增大其回弹模量逐渐增大,掺灰后的土体随着冻融循环的次数增加回弹模量逐渐减小;经历第一次冻融循环后的模量衰减幅度较大,经历6次冻融循环后其回弹模量值逐渐趋于稳定,各级掺量下的石灰土经冻融后模量衰减比例均小于素土;对于不同压实度下的土体,冻融循环下回弹模量衰减趋势大体相同,与未冻融土体相比,衰减值在30%左右。

To research resilient modulus changing law of lime modified soil with freeze and thaw, the experiment was carried out under different ratios of lime to soil and the optimum moisture content. The results indicate that when ratio of lime to soil is under 8%, the higher the ratio of lime to soil, the bigger the resilient modulus of lime modified soil, and the more the cycle times of freeze and thaw, the less the resilient modulus~ the decay amplitude of resilient modulus is the largest after the first time of freeze and thaw, and the resilient modulus after 6 times of freeze and thaw is gradually close to stability; under every ratio of lime to soil, the decay amplitude of lime- soil resilient modulus after freeze and thaw is lower than that of soil; for lime-soils with different compaetedness, decay trends about resilient moduli of lime-soil are roughly the same, and after freeze and thaw, the decay amplitude of resilient modulus is about 30% compared with lime-soil without freeze and thaw. 2 tabs, 4 figs, 12 refs.