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。 In order to study the variation law of the elastic modulus of lime-modified clay after its freeze-thaw cycle, the soil under the optimum water content with different lime content was studied. The test results show that the rebound modulus increases with the increase of the dosage of fly ash when the dosage of admixture is less than 8%, and the modulus of elasticity gradually increases with the increase of the number of freeze-thaw cycles Decrease after experiencing the first freeze-thaw cycle, and the modulus of elasticity after the first freeze-thaw cycle is larger. After six freeze-thaw cycles, the modulus of resilience tends to be stable gradually. For the soils with different compaction degrees, the attenuation trends of the elastic modulus under the freeze-thaw cycles are generally the same, and the attenuation values ​​are about 30% compared with the unfrozen and thawed soils.