Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

This paper is concerned with the performance of Rammed Aggregate Pier in soft ground at a selected site of South-West region of Bangladesh. The ground at the site consists of soft fine-grained soil up to great depth with a layer of organic soils at 4.5 to 9m depth from the existing ground surface. The Rammed Aggregate Piers (RAPs) were installed with locally fabricated equipments. Rammed Aggregate Pier of cylindrical shape having 0.75m diameter and 3.4m length were installed manually in three arrangements as single, double and group. A uniform mixture of local sand and brick aggregates at the proportion of 1:2 was used as the granular materials maintaining saturated surface dry condition. The granular materials were poured into the excavated hole in layers and hence compacted adequately by using a hammer of 108kg and a free fall height of 600mm. Load tests on full-size isolated square footing of 1.68x1.68m resting at a depth of 0.75m from the existing ground surface were conducted on both the natural and improved ground by using the method similar to pile load test. The result shows that the ultimate bearing capacity of footing resting on single, double and group RAP treated ground can be increased by 1.5, 1.8 and 1.96 times, respectively, comparing to that of natural ground. Field investigation reveals that the RAPs made-up of locally available granular materials and installation technique can be used successfully as a suitable ground improvement method to improve the bearing capacity of such soft ground.

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

Field Investigation on the Performance of Rammed Aggregate Pier in a Soft Ground of Bangladesh

Arlington, Virginia

This paper is concerned with the performance of Rammed Aggregate Pier in soft ground at a selected site of South-West region of Bangladesh. The ground at the site consists of soft fine-grained soil up to great depth with a layer of organic soils at 4.5 to 9m depth from the existing ground surface. The Rammed Aggregate Piers (RAPs) were installed with locally fabricated equipments. Rammed Aggregate Pier of cylindrical shape having 0.75m diameter and 3.4m length were installed manually in three arrangements as single, double and group. A uniform mixture of local sand and brick aggregates at the proportion of 1:2 was used as the granular materials maintaining saturated surface dry condition. The granular materials were poured into the excavated hole in layers and hence compacted adequately by using a hammer of 108kg and a free fall height of 600mm. Load tests on full-size isolated square footing of 1.68x1.68m resting at a depth of 0.75m from the existing ground surface were conducted on both the natural and improved ground by using the method similar to pile load test. The result shows that the ultimate bearing capacity of footing resting on single, double and group RAP treated ground can be increased by 1.5, 1.8 and 1.96 times, respectively, comparing to that of natural ground. Field investigation reveals that the RAPs made-up of locally available granular materials and installation technique can be used successfully as a suitable ground improvement method to improve the bearing capacity of such soft ground.