TY - JOUR
TI - Study on mechanical behavior and microscopic failure characteristics of deep rocks considering the influence of internal stress
AU - Li Fei
AU - Wang Xuan
AU - Zhou Lang
AU - Yang Zun-Dong
JN - Thermal Science
PY - 2025
VL - 29
IS - 2
SP - 1295
EP - 1300
PT - Article
AB - To address the limitation of traditional discrete element modelling in  considering internal stress, this study proposes a new numerical simulation  process based on particle flow code in 2-D, which successfully achieves  internal stress consolidation-sealing. Triaxial compression tests were  conducted to analyze the impact of internal stress evolution on rock  mechanical properties. Under a confining pressure of 10-20 MPa, internal  stress causes the peak stress of the rock to be higher than when there is no  internal stress, while the opposite is true at 30-40 MPa. The elastic  modulus is consistently higher in rocks with internal stress. The trend of  increasing the number of rock cracks with and without internal stress is  similar, and the growth rate of tensile cracks is higher than that of shear  cracks. Internal stress promotes crack propagation. The axial development of  cracks is more pronounced. This study offers new insights into in-situ rock  mechanics.