Performance of Mechanically Stabilized Earth Structures in Seismic Conditions

Mechanically Stabilized Earth (MSE) or Reinforced Soil structures are composite structures consisting of alternating layers of compacted backfill and soil reinforcement elements that are fixed to a facing. The stability of MSE structures is derived from the interaction between the backfill and soil reinforcements, involving friction and tension. The facing is relatively thin and is intended to perform the primary function of preventing erosion of the structural backfill. The significant relative cost saving that can be realized when this system is used compared to traditional RCC retaining structures, combined with ease of construction has resulted in widespread adoption of this technology in India and around the world. MSE structures have been found to perform satisfactorily when subjected to seismic loading conditions provided that recommended practices are adopted during their construction. This paper presents case studies of superior performance of MSE structures when subjected to seismic loading both during and after completion of construction including a case study on the behaviour of MSE structures founded on soft silt deposit in seismically active hilly terrain in the stretch from Quazigund to Baramulla where an earthquake measuring 5.4 on the Richter scale occurred during construction of the structure.