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SOIL PARAMETERS FOR THE LIMIT STATE DESIGN OF GEOSYNTHETIC REINFORCED SOIL WALLS

Author(s): Abdul Jabbar Khan
Keyword(s): Geosynthetic reinforced wall, limit state approach, geosynthetic reinforcements, constant volume angle of friction of soil, mobilized angle of friction of soil, cost benefit
Abstract: Most of the design methods for geosynthetic reinforced soil structures (GRSS) adopted in different codes are based either on Limit Equilibrium Approach or Hybrid Approach. Limit Equilibrium Approach addresses the Ultimate Limit State (ULS) explicitly and does not deal with Serviceability Limit State (SLS) at all. Hybrid Approach addresses the ULS explicitly and SLS implicitly. While Limit Equilibrium Approach uses peak angle of friction as the soil parameter for the purpose of design of GRSS, Hybrid Approach uses constant volume angle of friction for the ULS analysis and peak angle of friction of soil for the SLS analysis. In order to deal with both the ULS analysis and SLS analysis distinctly, a Limit State Approach of design was developed by McGown et al (1998). In this approach, it is suggested that the constant volume angle of friction should be used for the ULS analysis and the relationship between mobilized angle of friction and lateral tensile strain of soil should be used for the SLS analysis. However, it is shown by Berg et al (1998) that despite development of different approaches, the outcome design of GRSS is becoming increasingly conservative. In this study, it is identified that one of the major reasons for such conservatism is due to the choice of values of soil parameters used in the analysis.

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President's Message

Prof A. M. M. Safiullah

Warm greetings to BSGE members, well wishers and patrons. Thanks for your continued support in BSGE activities all through the years since formation of the society in 1989. I hope BSGE activities will be facilitated with this updated web page. Let's make it an effective means for communication and information sharing among our fellow members and geotechnical professionals/organizations at home and around the world. With the increase in infrastructure development in Bangladesh we have to face new geotechnical challenges in the coming years. I would request the civil engineers, academicians, contractors, geotechnical firms and all others relevant to the geotechnical engineering profession in the country for increased interaction through BSGE to develop and maintain standards so that we can face these challenges in a professional way