TY - JOUR
T1 - Influence of thermal treatment on mode I fracture toughness of certain Indian rocks
AU - Mahanta, Bankim
AU - Singh, T. N.
AU - Ranjith, P. G.
PY - 2016/8/5
Y1 - 2016/8/5
N2 - An experiment was carried out to measure the static mode I fracture toughness of Manoharpur sandstone, Bellary dolerite and Dholpur sandstone after thermal treatment at different temperatures that ranged from ambient conditions to 600 °C. The three-point bending method was applied using cracks straight through semi-circular bending (CSTSCB) specimens that were fabricated according to International Society for Rock Mechanics (ISRM) standards. Three different rocks were used to measure the degree of influence of thermal treatment on fracture toughness in different rocks. In addition, petrographic and X-ray diffraction (XRD) analyses were carried out to identify the compositions of these rocks. Finally, scanning electron microscope (SEM) analysis was performed in order to measure the micro-cracks that were induced within these rocks as a result of thermal treatment. The experimental results demonstrated that, up to a temperature range of 100 °C, the fracture toughness of Manoharpur sandstone, Bellary dolerite and Dholpur sandstone increased by 40%, 25% and 65%, respectively, when compared to the ambient condition, and thereafter decreased with a gradual increase of temperature. At 600 °C, when compared to the ambient condition, the fracture toughness of these rock types decreased by 59%, 36% and 30% for Manoharpur sandstone, Bellary dolerite and Dholpur sandstone, respectively.
AB - An experiment was carried out to measure the static mode I fracture toughness of Manoharpur sandstone, Bellary dolerite and Dholpur sandstone after thermal treatment at different temperatures that ranged from ambient conditions to 600 °C. The three-point bending method was applied using cracks straight through semi-circular bending (CSTSCB) specimens that were fabricated according to International Society for Rock Mechanics (ISRM) standards. Three different rocks were used to measure the degree of influence of thermal treatment on fracture toughness in different rocks. In addition, petrographic and X-ray diffraction (XRD) analyses were carried out to identify the compositions of these rocks. Finally, scanning electron microscope (SEM) analysis was performed in order to measure the micro-cracks that were induced within these rocks as a result of thermal treatment. The experimental results demonstrated that, up to a temperature range of 100 °C, the fracture toughness of Manoharpur sandstone, Bellary dolerite and Dholpur sandstone increased by 40%, 25% and 65%, respectively, when compared to the ambient condition, and thereafter decreased with a gradual increase of temperature. At 600 °C, when compared to the ambient condition, the fracture toughness of these rock types decreased by 59%, 36% and 30% for Manoharpur sandstone, Bellary dolerite and Dholpur sandstone, respectively.
KW - Fracture toughness
KW - Micro-fracture
KW - SCB specimen
KW - SEM
KW - Thermal treatment
UR - http://www.scopus.com/inward/record.url?scp=84974777748&partnerID=8YFLogxK
U2 - 10.1016/j.enggeo.2016.06.008
DO - 10.1016/j.enggeo.2016.06.008
M3 - Article
AN - SCOPUS:84974777748
VL - 210
SP - 103
EP - 114
JO - Engineering Geology
JF - Engineering Geology
SN - 0013-7952
ER -