CONTENTS

J. Duhok Univ., Vol.14, No.1 (Pure and Eng. Sciences), Pp 39-51, 2011
The unconfined compressive strength was
used along with the joint spacing of the rock
mass, measured in the field, to determine the
mechanical and the quality of the rock-mass
using the Z. T. Bieniwaski’s rock mass
classification diagram, (1974), Figure (6), on
which all data were plotted. The cohesion and
the angle of internal friction of the rocks were
also determined from the diagram.
There were six weathered rock zones, 40 to
80 cm in thicknesses with very close fracture
spacing existed within the upper part of the Pila
Fig. (5): Intact-rock modulus ratio, Deere and Miller Diagram, (1966).
Spi Dolomitic Limestone, Figure (3). These
weathered rock zones would affect the overall
quality of the rock at the abutments of the
proposed dam, so that, specific geotechnical
engineering measures are necessary to deal with
this case.
The above properties of the dolomitic
limestone, all together, are to be evaluated
qualitatively for the design of the dam
foundation, the abutments and for uses as a
construction materials, depending on the type of
the dam to be constructed.
Fig. (6): Rock mass classification diagram, Z.T. Bieniwaski, (1974)
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