Abstract
The moisture field of subgrade soil has great influence on the engineering performance of road embankment as well as above pavement. Rainfall or capillary elevation of shallow groundwater can increase the moisture content of subgrade soil, which may lead to instability of the embankment, frost heave and thaw settlement of road subgrade. Geosynthetic clay liner (GCL) is mainly used in engineering practice to work as an effective material of sealing, isolation and leakage prevention. Horizontal drainage material (HDM) with high directional permeability is able to laterally drain water out of soils. Both of them can be introduced into highway subgrade to provide possible moisture filed adjustment. In this research, the moisture field variations of highway subgrade due to introduction of a layer of GCL or HDM are studied respectively based on numerical simulation. Calculation results indicate that both materials can effectively reduce the infiltration of rain water and keep the stability of the road embankment. Furthermore, GCL works better than HDM in stopping rain water infiltration, but a drainage layer is suggested to be placed above the GCL.
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Liu, F., Liu, Z., Zhang, S., Zheng, J., Lei, S., Xu, C. (2018). Numerical Analysis of Different Effects of GCL and Horizontal Drainage Material on Moisture Field of Highway Subgrade. In: Li, L., Cetin, B., Yang, X. (eds) Proceedings of GeoShanghai 2018 International Conference: Ground Improvement and Geosynthetics. GSIC 2018. Springer, Singapore. https://doi.org/10.1007/978-981-13-0122-3_48
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DOI: https://doi.org/10.1007/978-981-13-0122-3_48
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