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eneration
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slich des
vg. habil.
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detection
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Sensing,
nds, pp.
ability of
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54, 244
ıltability
mation -
it of flu-
etry and
3c To-
r. An en-
ator: H.
n of ter-
ne laser
ummMeLTY
VI gener-
chives of
XXXIV,
prison of
of Pho-
XXXIV,
and au-
deedings
23. Au-
China.
of laser
of Pho-
1, B8.
10, and
'alyptus
data. In
and Re-
mn, Ger-
nbul 2004
DISCONTINUITY SURFACE ROUGHNESS MEASUREMENT TECHNIQUES AND THE
EVALUATION OF DIGITAL PHOTOGRAMMETRIC METHOD
M. Unaf , M. Yakar? & F. Yildiz?
?Selcuk University, Mining Engineering Department, Engineering- Architectural Faculty, 42031 Campus / KONYA —
, mrtunal (4) selcuk.edu.tr
Selcuk University, Geodesy and Photogrammetry Engineering Department, Engineering- Architectural Faculty,
42031 Campus / KONYA — yakar @ selcuk.edu.tr, fyildiz @ selcuk.edu.tr
Commission 111, WG 111/2
KEY WORDS: Joint surface roughness, Roughness measurement techniques, Photogrammetry, Digital photogrammetry, Digital
image processing, Surface roughness coefficient
ABSTRACT:
The development of the knowledge from classical photogrammetry to digital photogrammetry is provided simplicity on the works
carried out either on the field or on the laboratory. As a result of this development, the application of the photogrammetry science on
the various topics is increased its application to be used much more effectively.
Various means of discontinuity surface roughness determination methods have been developed for the isolation of the effects of
discontinuity surface roughness on shear strength, dilation and friction properties of surfaces. In this study, measurement
techniques used for modelling of the discontinuity surface roughness were defined and compared each other. The application of
digital photogrammetry on discontinuity surface is determined and a case study is presented. Moreover, results obtained by the
use of available measurement techniques were also discussed.
1. INTRODUCTION
On the earth surface, it is observed that discontinuities or joints
do not have smooth surface structures and they are covered with
random distributed roughness. Finding the effective role of
surface roughness on the behaviour of discontinuities and on
shear strength, made the surface roughness an important factor
that has to be taken into account in underground and on ground
projects such as tunnel, waste landfill, building, and slope, dam
on which the effect of shear strength is seen densely. The new
studies supported by new methods and technological advances
will make contributions to take well-defining of surface
roughness and effect of surface roughness on the behaviour of
discontinuities.
In this study, techniques that are used in measurement of
surface roughness are introduced briefly and these techniques
are compared with each other in certain parameters. In addition,
measurements were made by using different techniques on the
same sample surface and with data acquired from these
measurements three-dimensional model of sample surface are
defined. These geometrical defined surfaces are analysed with
numerical expressions and the results are discussed.
2. DISCONTINUITY SURFACE ROUGHNESS
MEASUREMENT TECHNIQUES
Roughness of a discontinuity surface can be measured by
enclosing the entire surface or an axis that is set in the direction
of potential sliding and a line on the rough surface.
In the literature, it is well known that different kinds of
techniques and methods are used in modelling and measurement
of surface roughness. Mostly used techniques are listed and
compared on Table 1.
As indicated by the Table 1, all techniques that are known to be
used in measurements of surface roughness are compared.
Among these techniques Digital Photogrammetry with its
measurement sensitivity, practicability, functionality and cost
taken together is seen advantageous as compared with other
techniques [Unal, 2000]. But if laser device gets much cheaper
by time, laser technique will have much more advantages.
