Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

This study was carried out following the development of abnormal faults and distresses that extend over more than two kilometers distance in an agricultural rural area to the North of Saudi Arabia. They appeared on the ground surface in the form of extended wide cracks and appeared across buildings, roads and green areas. Severe damages were inflicted to the existing structures and included cracks within the streets, the buildings and boundary walls. Geotechnical works carried out included advancing six boreholes to depths of 35 to 40 meters below grade. The subsurface soil profile was constructed and laboratory tests were carried out to characterize the shale and obtain relevant strength and swelling properties. The site was found to be overlain by a thin granular layer followed by elastic silt and/or silty shale extending 15 to 37m below top layers. The geophysical method used was the electrical resistivity using multi-electrode system of SYSCAL pro equipment. Several electrical resistivity lines were investigated across and along the crack zones. The outcome of the geophysical results was contrasted and compared to the geotechnical findings and all used to interpret the possible causes of these cracks. The electrical resistivity data were found to map the moisture profile in the area. The expansive soil is moisture sensitive and the data of electrical resistivity was found a good tool to spot areas of high and low moisture. The compiled data was found useful for evaluating the cause of damage and cracks in building construction within the distressed zone.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

Geotechnical and Geophysical Evaluation of the Near Surface Faults and Cracks in Residential Area Underlain by Semi-Arid Shale

Chicago, Illinois

This study was carried out following the development of abnormal faults and distresses that extend over more than two kilometers distance in an agricultural rural area to the North of Saudi Arabia. They appeared on the ground surface in the form of extended wide cracks and appeared across buildings, roads and green areas. Severe damages were inflicted to the existing structures and included cracks within the streets, the buildings and boundary walls. Geotechnical works carried out included advancing six boreholes to depths of 35 to 40 meters below grade. The subsurface soil profile was constructed and laboratory tests were carried out to characterize the shale and obtain relevant strength and swelling properties. The site was found to be overlain by a thin granular layer followed by elastic silt and/or silty shale extending 15 to 37m below top layers. The geophysical method used was the electrical resistivity using multi-electrode system of SYSCAL pro equipment. Several electrical resistivity lines were investigated across and along the crack zones. The outcome of the geophysical results was contrasted and compared to the geotechnical findings and all used to interpret the possible causes of these cracks. The electrical resistivity data were found to map the moisture profile in the area. The expansive soil is moisture sensitive and the data of electrical resistivity was found a good tool to spot areas of high and low moisture. The compiled data was found useful for evaluating the cause of damage and cracks in building construction within the distressed zone.