TY - JOUR
T1 - Crack initiation stress and strain of jointed rock containing multi-cracks under uniaxial compressive loading
T2 - A particle flow code approach
AU - Fan, Xiang
AU - Kulatilake, P. H.S.W.
AU - Chen, Xin
AU - Cao, Ping
N1 - Publisher Copyright:
© 2015, Central South University Press and Springer-Verlag Berlin Heidelberg.
PY - 2015/2
Y1 - 2015/2
N2 - The ratio of crack initiation stress to the uniaxial compressive strength (SCI,B/SUC,B) and the ratio of axial strain at the crack initiation stress to the axial strain at the uniaxial compressive strength (SA,S CI,B /SA,S UC,B were studied by performing numerical stress analysis on blocks having multi flaws at close spacing’s under uniaxial loading using PFC3D. The following findings are obtained: SCI,B/SUC,B has an average value of about 0.5 with a variability of ± 0.1. This range agrees quite well with the values obtained by former research. For joint inclination angle, β=90°, A,S CI,B /SA,S UC,B is found to be around 0.48 irrespective of the value of joint continuity factor, k. No particular relation is found between A,S CI,B /SA,S UC,B and β; however, the average A,S CI,B /SA,S UC,B seems to slightly decrease with increasing k. The variability of A,S CI,B /SA,S UC,B is found to increase with k. Based on the cases studied in this work, A,S CI,B /SA,S UC,B ranges between 0.3 and 0.5. This range is quite close to the range of 0.4 to 0.6 obtained for SCI,B/SUC,B. The highest variability of ± 0.12 for A,S CI,B /SA,S UC,B is obtained for k=0.8. For the remaining k values the variability of A,S CI,B /SA,S UC,B can be expressed within ± 0.05. This finding is very similar to the finding obtained for the variability of SCI,B/SUC,B.
AB - The ratio of crack initiation stress to the uniaxial compressive strength (SCI,B/SUC,B) and the ratio of axial strain at the crack initiation stress to the axial strain at the uniaxial compressive strength (SA,S CI,B /SA,S UC,B were studied by performing numerical stress analysis on blocks having multi flaws at close spacing’s under uniaxial loading using PFC3D. The following findings are obtained: SCI,B/SUC,B has an average value of about 0.5 with a variability of ± 0.1. This range agrees quite well with the values obtained by former research. For joint inclination angle, β=90°, A,S CI,B /SA,S UC,B is found to be around 0.48 irrespective of the value of joint continuity factor, k. No particular relation is found between A,S CI,B /SA,S UC,B and β; however, the average A,S CI,B /SA,S UC,B seems to slightly decrease with increasing k. The variability of A,S CI,B /SA,S UC,B is found to increase with k. Based on the cases studied in this work, A,S CI,B /SA,S UC,B ranges between 0.3 and 0.5. This range is quite close to the range of 0.4 to 0.6 obtained for SCI,B/SUC,B. The highest variability of ± 0.12 for A,S CI,B /SA,S UC,B is obtained for k=0.8. For the remaining k values the variability of A,S CI,B /SA,S UC,B can be expressed within ± 0.05. This finding is very similar to the finding obtained for the variability of SCI,B/SUC,B.
KW - PFC model
KW - axial strain at crack initiation stress S
KW - crack initiation stress (S)
KW - jointed rock
KW - multi flaws
KW - uniaxial loading
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U2 - 10.1007/s11771-015-2565-z
DO - 10.1007/s11771-015-2565-z
M3 - Article
AN - SCOPUS:84923334719
SN - 2095-2899
VL - 22
SP - 638
EP - 645
JO - Journal of Central South University
JF - Journal of Central South University
IS - 2
ER -