Numerical simulation on the dynamic mechanical response and fracture mechanism of rocks containing a single hole

被引:0
|
作者
Han, Zhenyu [1 ,3 ]
Liu, Kai [2 ]
Ma, Jinyin [3 ]
Li, Diyuan [3 ]
机构
[1] Monash Univ, Dept Civil Engn, Melbourne, Vic 3800, Australia
[2] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England
[3] Cent South Univ, Sch Resources & Safety Engn, Changsha 410083, Hunan, Peoples R China
基金
中国国家自然科学基金;
关键词
Hole; Rock dynamics; PFC; Crack propagation; Mechanical response; CRACK EVOLUTION MECHANISM; UNIAXIAL COMPRESSION; FAILURE BEHAVIOR; CIRCULAR HOLES; STRESS; GRANITE; TENSILE; MASS;
D O I
10.1007/s40789-024-00718-5
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Caverns and tunnels are constantly exposed to dynamic loads, posing a potentially significant threat to the safety of rock structures. To facilitate the understanding of dynamic fracture around openings, a series of discrete element models were established to numerically examine the effect of hole shape on dynamic mechanical properties and crack evolution. The results indicate that the existence of a hole greatly reduces dynamic strength, and the reduction is closely related to hole shape. The strain variation of pre-holed specimens is more complicated and even larger than the value of intact specimens. Although crack initiation differs for varying hole shapes, the entire structural collapse of specimens is controlled by macro shear cracks along the diagonal direction of the specimen, which are effectively identified by velocity trend arrows and contact force distribution. Finally, comparative analysis between failure pattern of pre-holed specimens under static and dynamic loads were conducted.
引用
收藏
页数:20
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