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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 7    July 2020

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Stability analysis method of geogrid reinforced expansive soil slopes and its engineering application
ZHANG Rui(张锐)1, 2, LONG Ming-xu(龙明旭)2, LAN Tian(兰天)2, ZHENG Jian-long(郑健龙)1, 2, GEOFF Chao3

1. National Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410114, China;
2. School of Traffic & Transportation Engineering, Changsha University of Science & Technology,Changsha 410114, China;
3. Department of Geotechnical and Earth Resources Engineering, Asian Institute of Technology, Klong Luang, Pathumthani 12120, Thailand

Abstract:The traditional stability analysis method of geogrid reinforced slopes does not consider the effect of lateral swelling, so it is not applicable to reinforced expansive soil slopes. This paper reports a new stability analysis method for geogrid reinforced expansive soil slopes. The additional pullout force of the free zone due to the lateral swelling and the anti-pullout safety factor of each geogrid layer were obtained by ensuring the overall stability of the reinforced slope. The optimum design was carried out to treat an expansive soil cut slope in Hubei Province, China, by changing the spacing and length of geogrid reinforcement. Calculation results show that the additional pullout force caused by lateral swelling has a great influence on the anti-pullout stability of geogrids, and the local stability of the reinforced slope will be overestimated if the swelling effect of soil in the free zone is not considered.

 

Key words: expansive soil; lateral swelling pressure; geogrid-soil interaction; stability analysis; engineering application

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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