Deformation Prediction and Deformation Characteristics of Multilayers of Mucky Clay under Artificial Freezing Condition

• Published in: KSCE journal of civil engineering Vol. 23; no. 3; pp. 1064 - 1076
• Main Authors: Tang, Yiqun, Xiao, Siqi, Zhou, Jie
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Civil Engineers 01.03.2019; Springer Nature B.V; 대한토목학회
• Subjects: Civil Engineering; Clay; Coastal engineering; Compression; Compression tests; Computation; Construction; Deformation; Engineering; Finite difference method; Freeze-thaw; Freezing; Frost; Frost heaving; Geotechnical Engineering; Geotechnical Engineering & Applied Earth Sciences; Ground freezing; Heaving; Industrial Pollution Prevention; Mathematical analysis; Mathematical models; Melting; Migration; Moisture content; Multilayers; Prediction models; Side effects; Soft clay; Soil; Soil freezing tests; Soil water; Soils; Thawing; Underground construction; Void ratio; Water content; 토목공학; frost heave; thaw settlement; water migration; mucky clay; artificial freezing soil
• DOI: 10.1007/s12205-019-1599-4
• ISSN: 1226-7988

Artificial ground freezing method, is a popular technique applied in coastal soft soil area for underground engineering construction. This method can bring some side effects, like frost heave and thaw settlement, due to the water migration in soil during freezing-thawing process. A self-designed one-dimensional freezing apparatus is used to study the deformation performance of the reconstituted soft clay from Shanghai 4th layer during freezing-thawing process. Test results show that total frost heave amount increases with decreasing boundary freezing temperature while it remains with the variation of initial water content in the test. The deformation of multilayers during freezing process reveals compression phenomenon due to the water migration in the soil samples. The compression area is the main part contributed to thaw settlement. Besides, a prediction model is established with void ratio as a variable to connect frost-heave model with thaw-settlement model. FDM (Finite Difference Method) method is used for computation through compiling code in MATLAB software. Comparison shows that compression phenomenon is necessary to be considered when calculating thaw settlement. This study provides valuable reference to the deformation control of soil in the construction of artificial ground freezing.