TY - JOUR
T1 - Experimental Study of Fracture Toughness and Subcritical Crack Growth of Three Rocks under Different Environments
AU - Zhao, Yanlin
AU - Zhang, Lianyang
AU - Liao, Jian
AU - Wang, Weijun
AU - Liu, Qiang
AU - Tang, Liming
N1 - Publisher Copyright:
© 2020 American Society of Civil Engineers.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - This paper investigates fracture toughness and subcritical crack growth of marble, lherzolite, and amphibolite under different environments aiming to better understand the effect of environment, especially the acidic solution, on the fracturing behavior of the three rocks. Specifically, a series of load relaxation (RLX) and rapid loading tests were performed on double-torsion (DT) specimens to understand the subcritical crack growth velocity V versus the stress intensity factor KI relation and evaluate the fracture toughness KIC for the three studied rocks in air, distilled water, and acidic solutions with pH of 6.0 and 3.0, respectively. The results indicate that, for all three studied rocks, the percentage of load drop during RLX increases and the fracture toughness decreases when the environmental condition changes from air to distilled water and to an acidic solution with higher acidity. The measured log KI-log V relation follows the Charles theory well, and the crack velocity and the final crack growth length both increase and the subcritical crack growth index n decreases when the environmental condition changes from air to distilled water and to an acidic solution with higher acidity. The results also show that the weakening effect of an acidic solution on the marble is much greater than that on the lherzolite and amphibolite.
AB - This paper investigates fracture toughness and subcritical crack growth of marble, lherzolite, and amphibolite under different environments aiming to better understand the effect of environment, especially the acidic solution, on the fracturing behavior of the three rocks. Specifically, a series of load relaxation (RLX) and rapid loading tests were performed on double-torsion (DT) specimens to understand the subcritical crack growth velocity V versus the stress intensity factor KI relation and evaluate the fracture toughness KIC for the three studied rocks in air, distilled water, and acidic solutions with pH of 6.0 and 3.0, respectively. The results indicate that, for all three studied rocks, the percentage of load drop during RLX increases and the fracture toughness decreases when the environmental condition changes from air to distilled water and to an acidic solution with higher acidity. The measured log KI-log V relation follows the Charles theory well, and the crack velocity and the final crack growth length both increase and the subcritical crack growth index n decreases when the environmental condition changes from air to distilled water and to an acidic solution with higher acidity. The results also show that the weakening effect of an acidic solution on the marble is much greater than that on the lherzolite and amphibolite.
KW - Acidic environment
KW - Double-torsion method
KW - Fracture toughness
KW - Subcritical crack growth
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U2 - 10.1061/(ASCE)GM.1943-5622.0001779
DO - 10.1061/(ASCE)GM.1943-5622.0001779
M3 - Article
AN - SCOPUS:85086755174
SN - 1532-3641
VL - 20
JO - International Journal of Geomechanics
JF - International Journal of Geomechanics
IS - 8
M1 - 04020128
ER -