Since 1963
ARTICLE
Prefabricated fractured rock under stepwise loading and unloading
1
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of
Science and Technology, Shandong University of Science and Technology, Qingdao, China
2
College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, China
3
National Demonstration Center for Experimental Mining Engineering Education, Shandong University of Science and
Technology, Qingdao, China
Submission date: 2021-10-28
Final revision date: 2021-12-13
Acceptance date: 2021-12-16
Online publication date: 2022-01-19
Publication date: 2022-01-20
Corresponding author
Tongbin Zhao
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, China
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, China
Journal of Theoretical and Applied Mechanics 2022;60(1):167-179
KEYWORDS
TOPICS
ABSTRACT
After the engineering rock mass has been affected by comprehensive effects of mining and
disturbance, it experiences an input of external energy as well as dissipation and release
of internal energy. From the viewpoint of energy, characteristics of rock failure are studied,
and the law of rock unstable deformation and energy evolution is analyzed. The damage
mechanism of rock is revealed easily. A gradual loading and unloading test of fractured rock
is carried out to analyze deformation characteristics of the fractured rock during the load-
-bearing process, and to study the law of energy dissipation and release under different load-
ing and unloading stress levels. The results show that: (1) the load-bearing time, loading and
unloading stress level, stress at crack initiation and peak stress of fractured rock gradually
decrease with an increase in the number of cracks, and the descending speed decreases grad-
ually with the increase in the number of cracks; (2) the strain at crack initiation and peak
strain of the fractured rock increase gradually with an increase in the number of cracks, and
the gathering speed decreases with the increase of the number of cracks; (3) the released
strain energy and dissipation energy of fractured rock increase with an increase of loading
and unloading stress levels, and the increasing rate gradually slows down; (4) the number of
acoustic emission events is positively related to the degree of rock damage, and the increase
in the number of cracks will prolong duration of the number of acoustic emission events. The
results have a theoretical value for energy evolution and deformation damage of fractured
rock masses, and also provide experimental experience to study the instability precursor
information of rock materials from the viewpoint of energy.
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