STRUCTURAL DEFORMATION MONITORING OF KIRI DAM, ADAMAWA STATE, NIGERIA

Edan J D, Abubakar T, Ono M N

Abstract


Deformation of structures is a major hazard worldwide and has in recent years become a challenge to surveyors, civil engineers, geologist, and other professionals of geosciences and environmental engineers. In this paper, a study was conducted on Kiri Dam where monitoring data for 12 epochs were used for both vertical and horizontal displacements. These data were collected using heights leveling and offset distance measurements for the vertical oscillation and horizontal displacements respectively. Observation equation method of least squares adjustment was used for adjusting the heights difference and the offset distances were adjusted by arithmetic mean method. The study revealed the minimum and maximum vertical movement of -238mm and 131mm which occurred in 1998 and 1996 at chainages 800m and 1300m respectively. For the horizontal displacement, there was a minimum and maximum of -161mm and 186mm which occurred in 1996 and 1989 at chainages 1400m and 1500m respectively. The results of the adjustments were tested using the null hypothesis, Ho at 5% significance level in which ANOVA method was used for both vertical and horizontal displacements. The results of the statistical test also revealed that the structure is experiencing small random movement in both vertical and horizontal sections which is not imposing significant force on the structure. It is recommended that the dam structures be monitored periodically to avert any catastrophic consequences. 

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References


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