TY - JOUR
TI - Mechanical properties and acoustic emission characteristics of granite under thermo-hydro-mechanical coupling
AU - Wang Xin-Zhong
AU - Wang Dong
AU - Wang Zhe-Wei
AU - Yin Xiao-Juan
AU - Zhou Xue-Jun
AU - Zhang Ru
AU - Zhang An-Lin
AU - Feng Gan
AU - Ren Li
JN - Thermal Science
PY - 2021
VL - 25
IS - 6
SP - 4585
EP - 4596
PT - Article
AB - Exploring the mechanical properties and thermal cracking characteristics of  rock under thermo-hydro-mechanical coupling in detail is of great importance  for the safe excavation and stability of deep rock engineering. The  mechanical properties and thermal cracking characteristics of granite under  burial depths of 1000 m (confining pressure of 25 MPa) and 1600 m (confining  pressure of 40 MPa) at a temperature of 110°C and a pore water pressure of  10 MPa were studied. The results show that the elastic modulus decreases with  increasing temperature under a confining pressure of 25 MPa, whereas under  a confining pressure of 40 MPa, the elastic modulus increases with  increasing temperature. As the pore water pressure increases, the elastic  modulus decreases slightly. Poisson's ratio increas­es with increasing  temperature below 40°C but decreases from 50-110°C. Pois­son's ratio  increases as pore water pressure increases. During the heating process,  acoustic emission activity is first detected at 30-40°C and is relatively  stable from 40-90°C. The acoustic emission activity increases sharply at  90-110°C, and the thermal cracking threshold of granite under  thermo-hydro-mechanical coupling is approximately 95°C.