Investigating Mechanical Properties of Cemented Soil under Static and Dynamic Loading after a Freeze-Thaw Cycle

Abstract

Grouting and artificial ground freezing (AGF) methods are usually adopted to reinforce stratum, and they are occasionally implemented concurrently to stabilize the stratum under the influence of tunnel construction for crucial projects. When the structural construction is completed, the stratum is followed by a natural thawing process. The freeze-thaw cycle can lead to significant variation in the engineering properties of cemented soils. In this paper, strength, dynamic elastic modulus, and dynamic damping ratio of cemented soils after a freeze-thaw cycle were investigated through static and dynamic triaxial tests. To better understand the behavior of cemented soils, the Duncan-Chang model was adopted and the model parameters were calibrated based on results from the triaxial test under static loads. In addition, empirical models were established to characterize the dynamic elastic modulus and dynamic damping ratio of cemented soils. Test results from the static load triaxial tests indicated a strong correlation between cement content and confining pressure and soil strength. The cumulative plastic strain under dynamic loading depended on several factors, including the cement content and loading frequency. The number of loading cycles, cement content, and loading frequency all had a significant impact on the dynamic elastic modulus and damping ratio. The results and findings presented in this study are beneficial for the design of underground structures subjected to cyclic loading.