Numerical Analysis of Different Effects of GCL and Horizontal Drainage Material on Moisture Field of Highway Subgrade

  • Feng Liu
  • Zhibin Liu
  • Shujian Zhang
  • Jian Zheng
  • Songlin Lei
  • Congyi Xu
Conference paper

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.

Keywords

Subgrade Rainfall Moisture field GCL HDM Numerical simulation 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Feng Liu
    • 1
  • Zhibin Liu
    • 1
  • Shujian Zhang
    • 2
  • Jian Zheng
    • 3
  • Songlin Lei
    • 2
  • Congyi Xu
    • 1
  1. 1.School of TransportationSoutheast UniversityNanjingChina
  2. 2.Jilin Provincial High Class Highway Construction BureauChangchunChina
  3. 3.Inner Mongolia Xing’anmeng Transportation BureauUlan HotChina

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