Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

During the year 1995, at Anta (India) gas power project township a large number of structures, which were constructed 4 to 6 years back started exhibiting damages of varying degree. From the nature and pattern of damages it appeared to be typical of distress due to expansive soil deposits underneath. In order to assess/investigate the causes for damages and suggest remedial measures, boreholes were drilled at suitable locations and soil samples were collected from different depths. Free swell index, percentage swell, swelling pressure and other relevant characteristics of soil samples were determined. The corrective measures suggested to salvage/rectify the distressed structures were treatment of expansive soil through lime slurry pressure injection (LSPI) process. In addition to LSPI, to maintain moisture equilibrium within the soil beneath the structure, plinth protection apron along with low density polyethylene film laid beneath and concrete curtain wall were constructed all around the structures. Post treatment performance of these structures was monitored. All these rectified/renovated structures are under observations since last eleven years and until this date exhibit satisfactory performance. The details of this case study are presented and discussed in the present article.

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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A Case Study on Rectification of Damaged Structures on Expansive Soil Deposits

Arlington, Virginia

During the year 1995, at Anta (India) gas power project township a large number of structures, which were constructed 4 to 6 years back started exhibiting damages of varying degree. From the nature and pattern of damages it appeared to be typical of distress due to expansive soil deposits underneath. In order to assess/investigate the causes for damages and suggest remedial measures, boreholes were drilled at suitable locations and soil samples were collected from different depths. Free swell index, percentage swell, swelling pressure and other relevant characteristics of soil samples were determined. The corrective measures suggested to salvage/rectify the distressed structures were treatment of expansive soil through lime slurry pressure injection (LSPI) process. In addition to LSPI, to maintain moisture equilibrium within the soil beneath the structure, plinth protection apron along with low density polyethylene film laid beneath and concrete curtain wall were constructed all around the structures. Post treatment performance of these structures was monitored. All these rectified/renovated structures are under observations since last eleven years and until this date exhibit satisfactory performance. The details of this case study are presented and discussed in the present article.