Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

Deep Dynamic Compaction technique was used to improve soil bearing capacity in one of the project in Pakistan. It was first project in the country where Deep Dynamic Compaction technique was used for soil improvement. The soil at construction site composed of alluvial deposits. The sub-surface profile with in the depth of influence of proposed structure comprised of different layers of varying thickness within the construction site. The top 1-2 meter strata was an imported fill compacted in layers and composed of sandy silty clayey soil with percentage of fines as high as 75 percent The water table was located at 12 m depth. The construction alternatives included deep foundation and improvement of bearing capacity using dynamic compaction technique; the later was adopted in view of the economy of the project. The depth and degree of improvement was evaluated by comparing pre to post compaction Standard Penetration Tests (SPT) and measuring depth of the crater after each drop. The paper discusses briefly the compaction design, methodology for evaluation of effectiveness and resultant improvement in depth and lateral direction. The results of the compaction program of research project have also been compared with those of various case histories.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Aug 11th, 12:00 AM Aug 16th, 12:00 AM

Enhancement of Bearing Capacity by Dynamic Compaction: A Case History

Arlington, Virginia

Deep Dynamic Compaction technique was used to improve soil bearing capacity in one of the project in Pakistan. It was first project in the country where Deep Dynamic Compaction technique was used for soil improvement. The soil at construction site composed of alluvial deposits. The sub-surface profile with in the depth of influence of proposed structure comprised of different layers of varying thickness within the construction site. The top 1-2 meter strata was an imported fill compacted in layers and composed of sandy silty clayey soil with percentage of fines as high as 75 percent The water table was located at 12 m depth. The construction alternatives included deep foundation and improvement of bearing capacity using dynamic compaction technique; the later was adopted in view of the economy of the project. The depth and degree of improvement was evaluated by comparing pre to post compaction Standard Penetration Tests (SPT) and measuring depth of the crater after each drop. The paper discusses briefly the compaction design, methodology for evaluation of effectiveness and resultant improvement in depth and lateral direction. The results of the compaction program of research project have also been compared with those of various case histories.