Session Start Date

6-1-1988

Abstract

The paper compares the measured and calculated settlements of two buildings and one concrete water tank founded on the red-weathered soils of Nsukka, Nigeria. Prior to actual construction of the structures the three sites were investigated, soil samples were collected and tested in the laboratory and the data collected were used to predict the total and differential settlements of the structures. Then permanent concrete slabs were established as bases at each of the three sites for observing other points. The theodolite was used at each of the sites to monitor the movements of each of the structures, starting from the time when the base concrete slab or footings were laid to the end of major or active construction operations. It was found that excepting the water tank which continued to settle albert slowly and uniformly, the buildings showed insignificant vertical settlement after about five years later and that the correlations between the measured and predicted settlements were relatively poor, generally less than 40 percent. The results suggested that the field or actual settlements were always larger than the predicted ones. The poor correlation was adduced to primarily the several and serious assumptions made in the establishment of the analytical equations for the determination of settlements analytically and also to the paucity of field data which could help to improve on the relevant consolidation equations using the field results.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Second Conference

Publisher

University of Missouri--Rolla

Publication Date

6-1-1988

Document Version

Final Version

Rights

© 1988 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Jun 1st, 12:00 AM

Correlation Between the Actual and Predicted Settlements of Structures at Nsukka, Nigeria

The paper compares the measured and calculated settlements of two buildings and one concrete water tank founded on the red-weathered soils of Nsukka, Nigeria. Prior to actual construction of the structures the three sites were investigated, soil samples were collected and tested in the laboratory and the data collected were used to predict the total and differential settlements of the structures. Then permanent concrete slabs were established as bases at each of the three sites for observing other points. The theodolite was used at each of the sites to monitor the movements of each of the structures, starting from the time when the base concrete slab or footings were laid to the end of major or active construction operations. It was found that excepting the water tank which continued to settle albert slowly and uniformly, the buildings showed insignificant vertical settlement after about five years later and that the correlations between the measured and predicted settlements were relatively poor, generally less than 40 percent. The results suggested that the field or actual settlements were always larger than the predicted ones. The poor correlation was adduced to primarily the several and serious assumptions made in the establishment of the analytical equations for the determination of settlements analytically and also to the paucity of field data which could help to improve on the relevant consolidation equations using the field results.