Affiliation:
1. Anhui Province Key Laboratory of Building Structure and Underground Engineering, Anhui Jianzhu University, Hefei 230601, China
2. Jining Planning and Design Institute, Jining 272100, China
Abstract
Computer-assisted pulse nuclear magnetic resonance (NMR) can be used to get important parameters for pore structure characteristics of porous materials. In order to fully understand the effect of frozen soil thaw settlement, the mechanism of artificially frozen soil thaw settlement was examined from a microscopic perspective in conjunction with the frozen soil thaw settlement test. Additionally, to have a better understanding of how pore features change during the thaw settling process, the evolution of the pore size distribution in silty sand was studied. The findings demonstrate the porosity is obviously larger than the initial porosity after freeze-thaw, and the evolution of thaw settlement displacement is related to the change in porosity as thawing progresses, which grows exponentially with porosity. The fraction of medium and large pores (>0.1 μm) in the soil increases significantly during the thawing process. Accordingly, there is a slight increase in the proportion of pores (<0.1 μm) during the thawing progress. The variation in the pore size distribution of silty sand is compatible with that in settlement displacement during the thawing process. Additionally, the thaw settling rate’s development law is consistent with that of the proportion of pores. The number of medium and large pores is critical in determining the rate of thaw settlement. In other words, the development law of thaw settlement rate is consistent with the development law of medium and large pore size distribution.
Funder
Natural Science Foundation of Anhui Province
Subject
General Engineering,General Mathematics
Reference35 articles.
1. Development and prospect of research on application of artificial ground freezing;R. Chen;Chinese Journal of Geotechnical Engineering,2000
2. The Frost Heaving and Heave Properties of Soils on the Projected Moscow–Kazan Railway
3. Model test on freezing reinforcement for shield junction in soft stratum (Part2): frost heave effect of soft stratum during freezing process;R. Shi;Rock and Soil Mechanics,2017
4. Improved prediction method for ground surface thawing settlement caused by the melting of tunnel horizontal frozen wall
5. Effects of Freezing and Thawing on the Consolidation Settlement of Soils
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献