STRAIN-RATE INFLUENCE ON SHEAR STRENGTH CHARACTERISTICS OF COMPACTED FADAMA CLAY
STRAIN-RATE INFLUENCE ON SHEAR STRENGTH CHARACTERISTICS OF COMPACTED FADAMA CLAY
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Date
2014-10-14
Authors
de Castro, Lydia C.
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Abstract
This study is concerned with the investigation of
strain-rate effects on shear strength characteristics of
saturated compacted Fadama Clay. The experimental program
consisted of consolidated undrained triaxial test with controlled
strain-rate. The rates of strain adopted are 0.0024,
0.006, 0.012 and 0.03 in/min. (0.08, 0.2, 0.4 and 1.0 %/min.,
respectively). This study mainly attempts to focus attention
on strain-rate effects on rate of strength increase with
respect to faster rates of deformation, strain at failure,
pore pressure development and strength parameters. A mathematical
equation is derived which best represents the relationship
of the above parameters and rate of strain. In the
analysis of test results, a direct functional relationships
such as (1) strength increases with increasing rate of strain,
(2) strength decreases with increasing time to failure, (3)
failure strain increases with increasing rate of strain, (4)
pore pressure increases with increasing time to failure and
(5) pore pressure decreases with increasing rate of strain
were obtained. A .simple method of Rate Process Theory is
described using Scott and Ko method (1968) for various cell
pressures of 10, 30 and 45 psi. (68.95, 206.85 and 310.28
kN/m2 ). The method used in the determination of the mineralogy
of Fadama Clay is also described. Observations obtained
in this study point to the fact that the properties of Shika
Fadama Clay can be improved under proper conditions of compaction.
Description
Submitted to the
Faculty of Engineering and Department of Civil Engineering
of Ahmadu Bello University, Zaria, in Fulfillment of the
Requirements for the Degree of Doctor of Philosophy
in
Civil Engineering
Keywords
STRAIN-RATE,, SHEAR STRENGTH CHARACTERISTICS,, COMPACTED FADAMA CLAY