Experimental and numerical study of crack propagation characteristics of tri-cracked rocks based on distinct element method
QI Jingming
ZHANG Hongdan
ZHOU Lei
CHEN Jianxing
MA Leijun
XIAO Xiaodong
Abstract：In order to study the static damage characteristics of the tri-cracked rock,the distinct element numerical simulation software PFC2D and model tests were used to analyze the peak strength,stress-strain curve and crack propagation characteristics of the tri-cracked rock,and to verify the feasibility of the distinct element numerical simulation method.By varying the horizontal confining pressure and crack length of rock,the mechanical response mechanism of the tri-cracked rock under uniaxial compressive loading was analyzed.The results show that the intermediate transverse crack has a greater effect on the peak stress of the cracked rock,and the intermediate vertical crack has a less effect on the peak stress of the cracked rock.During the loading process,stress concentration occurs at the crack tip primarily and ultimately two main cracks of about 70° are formed through three prefabricated cracks.With the increase of confining pressure,the peak stress of the tri-cracked rock increases first and then decreases.
Keywords：tri-cracked rockcrack propagationnumerical simulationdistinct element methodcrack inclination anglepre-stresscrack lengthpeak stress
Publication Date：2024-06-10
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 107-115 )