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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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Active earth pressure for subgrade retaining walls in cohesive backfills with tensile strength cut-off subjected to seepage effects
FU He-lin(傅鹤林)1, WANG Cheng-yang(王成洋)1, LI Huan(李寰)2

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. Department of Architecture and Civil Engineering, City University of Hongkong,
Hongkong 999077, China

Abstract:The commonly used Mohr-Coulomb (M-C) failure condition has a limitation that it overestimates the tensile strength of cohesive soils. To overcome this limitation, the tensile strength cut-off was applied where the predicted tensile strength is reduced or eliminated. This work then presented a kinematical approach to evaluate the active earth pressure on subgrade retaining walls in cohesive backfills with saturated seepage effects. An effective rotational failure mechanism was constructed assuming an associative flow rule. The impact of seepage forces, whose distribution is described by a closed-form solution, was incorporated into the analysis. The thrust of active earth pressure was derived from the energy conservation equation, and an optimization program was then coded to obtain the most critical solution. Several sets of charts were produced to perform a parameter analysis. The results show that taking soil cohesion into account has a distinct beneficial influence on the stability of retaining walls, while seepage forces have an adverse effect. The active earth pressure increases when tensile strength cut-off is considered, and this increment is more noticeable under larger cohesion.

 

Key words: active earth pressure; seepage effect; subgrade retaining wall; tensile strength cut-off

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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