TITLE:
Roughness Research of Center Profile Curve on Rock Fracture Surface Based on Statistical Method
AUTHORS:
Xuezai Pan, Zhigang Feng, Guoxing Dai, Hongguang Liu
KEYWORDS:
Rock Mechanics; Rock Fracture Surfaces; Normal Vector; Statistics; Normal Distribution
JOURNAL NAME:
Geomaterials,
Vol.3 No.2,
April
30,
2013
ABSTRACT: In order to research roughness of rock fracture surfaces whether to depend
on scale effect, Brazil discs were fractured under tensile and compression stresses
in Brazil split test with MTS (Mechanics Test Systems) and a laser
profilometer was used to scan rock fracture surfaces and coordinates datum of
central profile were acquired. A figure of the central profile was plotted
through the coordinates datum. A certain line segment length is regarded as a
step length, which is called scale and the scale length is taken to connect pairs
of closer peak points on the profile curve. The directional distribution
of every scale’s normal vector is analyzed by statistics and normal hypothesis test. Finally, some
statistics of sample degrees datum are compared with other ones and reach a conclusion
that roughness of center profile curve depends on scale effect. The
distribution of degrees more and more approximates normal distribution
along with increase of scale.