Alternative Title

Paper No. 1.41

Location

St. Louis, Missouri

Session Start Date

3-8-1998

Session End Date

3-15-1998

Abstract

The near surface limestones in Qatar have complex lithologies and have experienced diagenetic changes after deposition. A variety of weak limestones have been encountered in combination with matrix material (rock fragments and secondary fraction). The matrix, often clayey, sometimes cemented with gypsum, anhydrite or calcite grains, is not a rock nor does it qualify as a soil. These materials are: (i) difficult to sample in the undisturbed state. (ii) extremely variable m composition and proprieties, and (iii) appear susceptible to degradation, particularly when wet. This paper presents geotechnical information from selected sites where these materials (diagenetic limestone) have been encountered. Plate load test data carried out to predict settlements arc shown. Arrival at appropriate foundation geometries and allowable bearing capacity values, consistent with field conditions, are noted. For the present, design is largely empirical and dependent upon site-specific information aided by the plate load tests and on occasion, with field load tests.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-8-1998

Document Version

Final Version

Rights

© 1998 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Shallow Foundations on a Diagenetic Limestone Formation in Qatar

St. Louis, Missouri

The near surface limestones in Qatar have complex lithologies and have experienced diagenetic changes after deposition. A variety of weak limestones have been encountered in combination with matrix material (rock fragments and secondary fraction). The matrix, often clayey, sometimes cemented with gypsum, anhydrite or calcite grains, is not a rock nor does it qualify as a soil. These materials are: (i) difficult to sample in the undisturbed state. (ii) extremely variable m composition and proprieties, and (iii) appear susceptible to degradation, particularly when wet. This paper presents geotechnical information from selected sites where these materials (diagenetic limestone) have been encountered. Plate load test data carried out to predict settlements arc shown. Arrival at appropriate foundation geometries and allowable bearing capacity values, consistent with field conditions, are noted. For the present, design is largely empirical and dependent upon site-specific information aided by the plate load tests and on occasion, with field load tests.