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Computation of Seismic Active Earth Thrust on Retaining Wall for c-φ Backfill
The concept of seismic active earth thrust is essential for the safe design of earth retaining walls in the seismic zone. In the proposed method, reaction along the planar failure surface is obtained using Kötter's (1903) equation. Further, limit equilibrium method is effectively used to compute active earth thrust considering pseudo-static condition with both horizontal and vertical seismic co-efficients. An attempt is made to locate the point of application of active thrust using moment equilibrium condition in c-φ backfill. This study is further extended to compute active earth thrust considering pseudo-dynamic condition which is more realistic in representing time and phase difference within the soil backfill. The effects of various parameters - such as angle of internal friction, wall friction angle, and angle of backfill inclination, horizontal and vertical seismic co-efficient, shear wave, and compression wave - are discussed. It is seen that seismic active earth thrust decreases with increase in both friction angle and cohesion. Further, active earth thrust increases with increase in horizontal seismic co-efficient and surcharge angle. The results obtained by the trial and error method are underestimated by 2% as compared to the results obtained from the pseudo-static and pseudo-dynamic analytical approaches suggested by Sharma and Ghosh (2010). Similarly, predictions made in case of static approach are in good agreement with results obtained from analytical approach suggested by Sharma and Ghosh (2010).
Computation of Seismic Active Earth Thrust on Retaining Wall for c-φ Backfill
The concept of seismic active earth thrust is essential for the safe design of earth retaining walls in the seismic zone. In the proposed method, reaction along the planar failure surface is obtained using Kötter's (1903) equation. Further, limit equilibrium method is effectively used to compute active earth thrust considering pseudo-static condition with both horizontal and vertical seismic co-efficients. An attempt is made to locate the point of application of active thrust using moment equilibrium condition in c-φ backfill. This study is further extended to compute active earth thrust considering pseudo-dynamic condition which is more realistic in representing time and phase difference within the soil backfill. The effects of various parameters - such as angle of internal friction, wall friction angle, and angle of backfill inclination, horizontal and vertical seismic co-efficient, shear wave, and compression wave - are discussed. It is seen that seismic active earth thrust decreases with increase in both friction angle and cohesion. Further, active earth thrust increases with increase in horizontal seismic co-efficient and surcharge angle. The results obtained by the trial and error method are underestimated by 2% as compared to the results obtained from the pseudo-static and pseudo-dynamic analytical approaches suggested by Sharma and Ghosh (2010). Similarly, predictions made in case of static approach are in good agreement with results obtained from analytical approach suggested by Sharma and Ghosh (2010).
Computation of Seismic Active Earth Thrust on Retaining Wall for c-φ Backfill
Deshmukh, V. B. (author) / Babaria, N. H. (author) / Dewaikar, D. M. (author)
Geo-Shanghai 2014 ; 2014 ; Shanghai, China
2014-05-05
Conference paper
Electronic Resource
English
Computation of Seismic Active Earth Thrust on Retaining Wall for c-0. Backfill
| British Library Conference Proceedings | 2014
| British Library Online Contents | 2008