A SUBSIDENCE MONITORING PROGRAM FOR AHMADU BELLO UNIVERSITY DAM, ZARIA.
A SUBSIDENCE MONITORING PROGRAM FOR AHMADU BELLO UNIVERSITY DAM, ZARIA.
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Date
1987-06
Authors
OLUYORI, PAUL DARE
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Abstract
A research project dealing with the determination
and monitoring of subsidence (vertical movements) of
A.B.U. Dam as a result of increase in volume of
water in the reservoir, causing sudden load (causative
effects) on the dam is discribed. It is of great
interest and importance to design a program to detect,
direction of these movements so as to plan (an)
appropriate measure(s) against the disastrous consequences
of such movements. These require precise
instruments of high measuring accuracy and reliability,
refined survey methods incorporating quick and frequent
check operations and analysis of results. The Dam is
an earth dam. A review of current monitoring techniques
was given. Repeated Precise levellings of
elevation of monitoring stations were made before
the start of rainfall (low water level) in April,
and after maximum rainfall (highest water level) has
been recorded, in August. An approach whereby
upper and lower stadia staff readings were not
recorded but using only the center hair reading of
both left and right graduations on staff was adopted.
The advantages of this method were stated. Rigorous
least squares adjustment was carried out. Analysis
of the data by Chi square test was done to determine
the acceptability of the levelling. It is acceptable
at the 95% confidence limit. The deformation
analysis was done using the "Karlsrue" procedure
and it is based on the general hypothesis test.
The measurements show movement (subsidence) of
monitoring stations and hence the dam. These movements
can be attributed to the effect of sudden
load on the dam. The results also suggest the need
for such a monitoring program. Recommendations are
given at the end.
Description
A Thesis submitted to the Postgraduate
School, Ahmadu Bello University, in
Partial Fulfillment of the requirements
for the degree of M.Sc. Land Surveying.
Department of Surveying, Faculty of
Engineering, Ahmadu Bello University,
Zaria.
June, 1987.
Keywords
SUBSIDENCE MONITORING,, AHMADU BELLO UNIVERSITY DAM,, ZARIA..