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A platform for research: civil engineering, architecture and urbanism
Effect of Backfill Sand Density on Dynamic Response of Mechanically Stabilized Earth (MSE) Walls
Seismic resistant design of mechanically stabilized earth (MSE) wall is essential for safe construction of these structures in earthquake-prone areas. The seismic behavior of a geogrid-reinforced soil retaining wall was experimentally studied and presented here. The influence of the relative density of fine backfill sand was studied using 1-g shaking table tests. Small-scale retaining wall models were constructed with two layers of geogrid on a uniaxial shaking table. The MSE wall was instrumented with accelerometers and LVDTs. Four models were tested with three increasing input peak ground acceleration (PGA) values to study the performance of these models. The face deformations and acceleration amplification factor (AAF) were estimated at different elevations for all models. Analyzing the performance of retaining structures under seismic ground shaking conditions helps in better understanding of their behavior during an earthquake and to design these structures more efficiently. The experimental results indicated that horizontal face deformations decrease as the backfill soil relative density was increased. It was also observed that AAF decreased when the base excitation was increased. This amplification is higher in dense soil backfill compared to loose soil. Hence, it was concluded that using fine sand in the dense state as fill material in retaining wall produces lower deformations in the facing wall as compared to the loose state of the sand.
Effect of Backfill Sand Density on Dynamic Response of Mechanically Stabilized Earth (MSE) Walls
Seismic resistant design of mechanically stabilized earth (MSE) wall is essential for safe construction of these structures in earthquake-prone areas. The seismic behavior of a geogrid-reinforced soil retaining wall was experimentally studied and presented here. The influence of the relative density of fine backfill sand was studied using 1-g shaking table tests. Small-scale retaining wall models were constructed with two layers of geogrid on a uniaxial shaking table. The MSE wall was instrumented with accelerometers and LVDTs. Four models were tested with three increasing input peak ground acceleration (PGA) values to study the performance of these models. The face deformations and acceleration amplification factor (AAF) were estimated at different elevations for all models. Analyzing the performance of retaining structures under seismic ground shaking conditions helps in better understanding of their behavior during an earthquake and to design these structures more efficiently. The experimental results indicated that horizontal face deformations decrease as the backfill soil relative density was increased. It was also observed that AAF decreased when the base excitation was increased. This amplification is higher in dense soil backfill compared to loose soil. Hence, it was concluded that using fine sand in the dense state as fill material in retaining wall produces lower deformations in the facing wall as compared to the loose state of the sand.
Effect of Backfill Sand Density on Dynamic Response of Mechanically Stabilized Earth (MSE) Walls
Lecture Notes in Civil Engineering
Patel, Satyajit (editor) / Solanki, C. H. (editor) / Reddy, Krishna R. (editor) / Shukla, Sanjay Kumar (editor) / Nandan, Sumit Kumar (author) / Bandyopadhyay, Tirtha Sathi (author) / Chakrabortty, Pradipta (author)
2021-05-06
11 pages
Article/Chapter (Book)
Electronic Resource
English