Abstract：Based on a lot of dynamic triaxial tests，the variation laws of dynamic elastic modulus of lime soil sample were studied. Meanwhile，the influences of lime dosage ratio，consolidation ratio，and frequency on elastic modulus were investigated. It is concluded that the relationship between elastic modulus and dynamic strain of lime soil is similar to that of natural soil. The elastic modulus increases as the confining pressure increases at the same level. With dosage ratio increasing，the elastic modulus also increases，and when it exceeds 5%，the elastic modulus increases evidently. The influence of consolidation ratio on modulus is significant. At a lower strain，the modulus increases with the consolidation of ratio increasing. When strain exceeds a certain value，the modulus decreases with consolidation ratio increasing. The higher the frequency is，the larger the modulus is. But the influence of frequency on modulus is not as evident as above factors. It is verified that the way to adopt the soft soil of unfavourable mechanical properties by adding lime as road fillings is economical and practicable. The achieved conclusions can provide a useful guidance for the preliminary estimation of lime requirements to improve the dynamic properties of clays. .
