Effect of GCL on Moisture and Temperature Fields of Highway Subgrade Through Numerical Analysis
The performance of highway subgrade is affected not only by soil type but also by other parameters such as water and temperature. Distribution and variation of temperature in subgrade affect the stability of highway subgrade in seasonal frozen area. In seasonal frozen areas, water accumulation in highway subgrade can cause frost heave and thaw settlement, which will finally affect the function of road structures. Due to its waterproof performance, geosynthetic clay liner (GCL) is mainly used in engineering practice as an effective material for sealing, isolation and leakage prevention. So it may be introduced into highway subgrade to provide possible moisture and temperature adjustment. Through water and heat coupling analysis of two kinds of subgrade models, following conclusions can be drawn. GCL can effectively prevent rainfall infiltration and adjust moisture field of subgrade. GCL in the subgrade can significantly decrease the maximum freezing depth and thereby reduce the frost damage risk of the highway subgrade in Seasonal frozen soil area.
KeywordsGCL Moisture and temperature fields Numerical simulation
This research was sponsored by the National Natural Science Foundation of China (No. 41672280, 41330641). The authors are also grateful for the financial supports from Traffic Science and technology projects of Inner Mongolia and Jilin Province.
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