TY  - JOUR
AU  - Lai, Y.
AU  - Zhao, K.
AU  - He, Z.
AU  - Yu, X.
AU  - Yan, Y.
AU  - Li, Q.
AU  - Shao, H.
AU  - Zhang, X.
AU  - Zhou, Y.
TI  - Fractal characteristics of rocks and mesoscopic fractures at different loading rates
JF  - GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
J2  - GEOMECH ENERGY ENVIR
VL  - 33
PY  - 2023
PG  - 12
SN  - 2352-3808
DO  - 10.1016/j.gete.2022.100431
UR  - https://m2.mtmt.hu/api/publication/33668165
ID  - 33668165
AB  - Uniaxial compression tests were conducted on rocks under different loading rates to analyze their effect on rock fragmentation. The fractal dimension of the macroscopic fragmentations of the rocks were then calculated by combining the fractal theory. Based on scanning electron microscopy (SEM), the macroscopic failure characteristics and mesoscopic fracture morphology characteristics of the rocks under different loading rates were compared and analyzed; the mesoscopic fractal dimension of the fracture was calculated using the box dimension method. The results demonstrate that when the loading rate is increased from 0.001 to 0.05 mm/s, the average fragmentation distribution coefficient decreases from 18.99 to 16.37 mm. As the loading rate increases, the fragmentation distribution coefficient gradually decreases, and the rock sample breaks; the degree of failure gradually increases, and the failure mode of the rock transforms from tension to shear failure. The SEM analysis reveals that under low loading rates, an intergranular fracture indicates the primary failure mode. The macroscopic performance primary presents tensile failure; as the loading rate increases, the range of the transgranular fracture gradually increases, and the failure mode evolves from an intergranular to transgranular fracture. The fractal dimension of the mesoscopic structure of the rock fracture tends to increase with an increase in the loading rate, and demonstrates a good positive relationship by fitting with the macrostructure fractal dimension. A larger fractal dimension of the microstructure of a rock fracture indicates more complex structure of the fractured surface. This study provides a better understanding of the meso-rock failure mechanism, and presents significant findings regarding ore rock fragmentation and rockburst prevention. © 2022
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Vásárhelyi, Balázs
AU  - Kovács, Dorottya
TI  - Empirical methods of calculating the mechanical parameters of the rock mass
JF  - PERIODICA POLYTECHNICA-CIVIL ENGINEERING
J2  - PERIOD POLYTECH CIV ENG
VL  - 61
PY  - 2017
IS  - 1
SP  - 39
EP  - 50
PG  - 12
SN  - 0553-6626
DO  - 10.3311/PPci.10095
UR  - https://m2.mtmt.hu/api/publication/3153855
ID  - 3153855
N1  - Admin megjegyzés-26816725
#JournalID1#
Name: Periodica Polytechnica Civil Engineering
ISSN: 0553-6626
#JournalID2#
Cited By :22            
            Export Date: 22 June 2021            
            Correspondence Address: Vásárhelyi, B.; Department of Engineering Geology and Geotechnics, P.O.B. 91, Hungary; email: vasarhelyi.balazs@epito.bme.hu
Cited By :23            
            Export Date: 9 September 2021            
            Correspondence Address: Vásárhelyi, B.; Department of Engineering Geology and Geotechnics, P.O.B. 91, Hungary; email: vasarhelyi.balazs@epito.bme.hu
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Julia, Vladimirovna Frolova
TI  - Современные подходы к изучению скальных грунтов и их массивов (обзор по материалам XII конгресса маиг-2014) [Current approaches to the srudy of rock mechanics and rock massifs (overview of XII IAEG Congress proceedings)]
JF  - Geoekologia Inzeneria Geologia Gudrogeologia Geokriologia
J2  - GIGGG
VL  - 2015
PY  - 2015
IS  - 6
SP  - 553
EP  - 560
PG  - 8
SN  - 0869-7809
UR  - https://m2.mtmt.hu/api/publication/32438478
ID  - 32438478
LA  - Russian
DB  - MTMT
ER  -