TY - JOUR
T1 - Experimental investigation on the nonlinear characteristics of energy evolution and failure characteristics of coal under different gas pressures
AU - Xue, Yi
AU - Liu, Jia
AU - Ranjith, P. G.
AU - Zhang, Zhizhen
AU - Gao, Feng
AU - Wang, Songhe
N1 - Funding Information:
The authors are grateful to the financial support from the National Natural Science Foundation of China (12002270), the China Postdoctoral Science Foundation (2020M683686XB, 2020M673451, 2021T140553, 2021M692600), and the Youth Talent Promotion Project of the Xi’an Association for Science and Technology (095920211334).
Publisher Copyright:
© 2021, Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2021/12/22
Y1 - 2021/12/22
N2 - Studying the energy evolution characteristics of coal in a deep underground engineering environment will help people to understand the evolution process and induced mechanism of geological disaster and risk. To explore the influence mechanism of gas pressure on coal deformation, failure, and energy evolution, triaxial compression tests of coal under different gas pressure conditions were conducted in this study. Based on the test data, the mechanical properties, acoustic emission (AE) energy characteristics, and nonlinear characteristics of the energy evolution of coal containing gas were obtained. A theoretical formula for analyzing energy evolution is introduced. After this theoretical formula is verified by test data, the evolution characteristics of three energy rates (derivative of energy to stress) of coal are obtained based on this formula. It is found that energy rate can be used as a new effective mechanical parameter to analyze and predict the damage and failure characteristics of coal. The energy dissipation characteristics before the peak can be divided into two types: high dissipative energy rate type (HDERT) and low dissipative energy rate type (LDERT), which indicates different failure modes (plastic failure and brittle failure). On this basis, the ratio of dissipative energy rate and input energy rate is further defined to effectively distinguish the two types of dissipative energy rates of coal mass. The research results are helpful to explore the fracturing evolution and energy driving mechanism of coal, and then play a guiding role in rock instability prediction and support and reinforcement measures selection.
AB - Studying the energy evolution characteristics of coal in a deep underground engineering environment will help people to understand the evolution process and induced mechanism of geological disaster and risk. To explore the influence mechanism of gas pressure on coal deformation, failure, and energy evolution, triaxial compression tests of coal under different gas pressure conditions were conducted in this study. Based on the test data, the mechanical properties, acoustic emission (AE) energy characteristics, and nonlinear characteristics of the energy evolution of coal containing gas were obtained. A theoretical formula for analyzing energy evolution is introduced. After this theoretical formula is verified by test data, the evolution characteristics of three energy rates (derivative of energy to stress) of coal are obtained based on this formula. It is found that energy rate can be used as a new effective mechanical parameter to analyze and predict the damage and failure characteristics of coal. The energy dissipation characteristics before the peak can be divided into two types: high dissipative energy rate type (HDERT) and low dissipative energy rate type (LDERT), which indicates different failure modes (plastic failure and brittle failure). On this basis, the ratio of dissipative energy rate and input energy rate is further defined to effectively distinguish the two types of dissipative energy rates of coal mass. The research results are helpful to explore the fracturing evolution and energy driving mechanism of coal, and then play a guiding role in rock instability prediction and support and reinforcement measures selection.
KW - Acoustic emission
KW - Coal containing gas
KW - Energy evolution
KW - Fractal characteristics
KW - Nonlinear characteristic
UR - https://www.scopus.com/pages/publications/85121545911
U2 - 10.1007/s10064-021-02544-4
DO - 10.1007/s10064-021-02544-4
M3 - Article
AN - SCOPUS:85121545911
SN - 1435-9529
VL - 81
JO - Bulletin of Engineering Geology and the Environment
JF - Bulletin of Engineering Geology and the Environment
IS - 1
M1 - 38
ER -