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Dynamic Compaction of Sandy and Silty Soils Near Delhi for Liquefaction Mitigation
Along the DFCC alignment near Delhi, loose to medium dense sandy silts or silty sands deposits were encountered at certain stretches. The water table was also located at very shallow depths at these locations. The subsoil below the embankment was identified to possess liquefaction potential up to a depth of 8–11 m from EGL. Though different compaction techniques are available to densify the soil and mitigate the liquefaction potential, the dynamic compaction technique was considered to be most effective for deep liquefiable soil deposit depths up to 11.0 m from EGL.
It is pertinent to note that Delhi has inherent shortage of stone aggregates, thereby making stone columns option unviable. The vibro compaction was also not possible due to higher percentage of silts. Due to deeper depths of liquefiable soils, the surficial compactions techniques were also not considered to be effective. Looking at these facts, dynamic compaction is found quite useful, fast and cost-effective to treat these soils more effectively.
A precast concrete tamper of desired weight was used for compaction. The sandy material was used to backfill the ground subsidence formed during dynamic compaction.
The spacing and number of drop points are adopted based on design approach and field trials. Field tests (standard penetration tests) carried out before and after dynamic compaction indicated that the ground improvement has been successful to the desired depth.
Dynamic Compaction of Sandy and Silty Soils Near Delhi for Liquefaction Mitigation
Along the DFCC alignment near Delhi, loose to medium dense sandy silts or silty sands deposits were encountered at certain stretches. The water table was also located at very shallow depths at these locations. The subsoil below the embankment was identified to possess liquefaction potential up to a depth of 8–11 m from EGL. Though different compaction techniques are available to densify the soil and mitigate the liquefaction potential, the dynamic compaction technique was considered to be most effective for deep liquefiable soil deposit depths up to 11.0 m from EGL.
It is pertinent to note that Delhi has inherent shortage of stone aggregates, thereby making stone columns option unviable. The vibro compaction was also not possible due to higher percentage of silts. Due to deeper depths of liquefiable soils, the surficial compactions techniques were also not considered to be effective. Looking at these facts, dynamic compaction is found quite useful, fast and cost-effective to treat these soils more effectively.
A precast concrete tamper of desired weight was used for compaction. The sandy material was used to backfill the ground subsidence formed during dynamic compaction.
The spacing and number of drop points are adopted based on design approach and field trials. Field tests (standard penetration tests) carried out before and after dynamic compaction indicated that the ground improvement has been successful to the desired depth.
Dynamic Compaction of Sandy and Silty Soils Near Delhi for Liquefaction Mitigation
Lecture Notes in Civil Engineering
Satyanarayana Reddy, C. N. V. (editor) / Saride, Sireesh (editor) / Krishna, A. Murali (editor) / Somwanshi, Amit (author) / Ghan, Sandeep (author) / Tipnis, Manoj (author)
2021-07-28
9 pages
Article/Chapter (Book)
Electronic Resource
English
Liquefaction mitigation in silty soils using composite stone columns and dynamic compaction
| Online Contents | 2004
| British Library Conference Proceedings | 1994