Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

The study presents the results of case histories on failure of embankments in Bangladesh based on the field visits to the embankments sites, collected data and information on failure of embankments necessary data related to embankments construction practice obtained from available publications and soil conditions of the breached embankments in Bangladesh. Efforts have been made to discuss briefly the causes of embankment failure and its possible remedial measures. Two recent failures of embankments that occurred in the year 2007 are taken into consideration for a detailed study. For each case, embankment failure mechanism, construction method used for the embankments, soil conditions, embankment geometry and water levels are collected and analyses are made for slope stability with and without water storage conditions. Soil samples collected during field visits are analyzed. On the basis of the results of analyses and discussions, it is concluded that the major causes of failure of earlier embankments are identified as breach of the embankment, cutting by public, overflow, erosion, seepage and sliding. Other causes were poor planning, design and faulty construction. The cause of failure of all the flood control embankments in the year 2007 could be attributed to erosion and sliding of embankment materials due to river encroachment and mitigation. Slope stability analyses of the Padma and Jamuna flood control embankments revealed that the country side slopes of both the embankments are not at all stable during the monsoon when the water level is high. The Jamuna flood control embankment is not stable even before and after the monsoon period because the factor of safety calculated for the country side slopes are less than that of the recommended one. Of the two cases studied detailed in this research articles, it is observed that there are substantial differences between the cross sections shown in the actual designs that existed near to the failure locations. A close investigation of the above two cases indicates that no protective measures such as mattressing, stone pitching, concrete layers, artificial or natural reinforcement like grassing, soil-cement layer are made to prevent the embankments from rain splash, water current, waves, storm surges, and other natural calamities and destructive forces. It is recommended that the embankments should be constructed by following the proper design and construction procedure, and be protected by using some forms of reinforcements or surface covering/treatment.

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

An Investigation on Failure of Embankments in Bangladesh

Arlington, Virginia

The study presents the results of case histories on failure of embankments in Bangladesh based on the field visits to the embankments sites, collected data and information on failure of embankments necessary data related to embankments construction practice obtained from available publications and soil conditions of the breached embankments in Bangladesh. Efforts have been made to discuss briefly the causes of embankment failure and its possible remedial measures. Two recent failures of embankments that occurred in the year 2007 are taken into consideration for a detailed study. For each case, embankment failure mechanism, construction method used for the embankments, soil conditions, embankment geometry and water levels are collected and analyses are made for slope stability with and without water storage conditions. Soil samples collected during field visits are analyzed. On the basis of the results of analyses and discussions, it is concluded that the major causes of failure of earlier embankments are identified as breach of the embankment, cutting by public, overflow, erosion, seepage and sliding. Other causes were poor planning, design and faulty construction. The cause of failure of all the flood control embankments in the year 2007 could be attributed to erosion and sliding of embankment materials due to river encroachment and mitigation. Slope stability analyses of the Padma and Jamuna flood control embankments revealed that the country side slopes of both the embankments are not at all stable during the monsoon when the water level is high. The Jamuna flood control embankment is not stable even before and after the monsoon period because the factor of safety calculated for the country side slopes are less than that of the recommended one. Of the two cases studied detailed in this research articles, it is observed that there are substantial differences between the cross sections shown in the actual designs that existed near to the failure locations. A close investigation of the above two cases indicates that no protective measures such as mattressing, stone pitching, concrete layers, artificial or natural reinforcement like grassing, soil-cement layer are made to prevent the embankments from rain splash, water current, waves, storm surges, and other natural calamities and destructive forces. It is recommended that the embankments should be constructed by following the proper design and construction procedure, and be protected by using some forms of reinforcements or surface covering/treatment.