The modeling of crack propagation and coalescence in rocks under uniaxial compression using the novel conjugated bond-based peridynamics

被引：238
作者：
Wang Yunteng [2 ,3 ]
Zhou Xiaoping [1 ,2 ,3 ]
Shou Yundong [2 ,3 ]
机构：
[1] Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400045, Peoples R China
[2] Chongqing Univ, Sch Civil Engn, Chongqing 400045, Peoples R China
[3] Chongqing Univ, Key Lab New Technol Construct Cities Mt Area, Chongqing 40045, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES | 2017年 / 128卷
基金：
中国国家自然科学基金;
关键词：
Novel conjugated BB-PD; Normal stretch of bonds; A pair of conjugated bonds; Propagation and coalescence of cracks; Rock materials; STATE-BASED PERIDYNAMICS; FRACTURE COALESCENCE; ADAPTIVE REFINEMENT; DEFORMATION; NONORDINARY; FAILURE; FLAWS;
D O I：
10.1016/j.ijmecsci.2017.05.019
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
In this paper, crack propagation and coalescence behaviors in rock specimens containing pre-existing open flaws under uniaxial compression are investigated using the novel conjugated bond-based peridynamics (BB-PD). The novel conjugated BB-PD is an extended BB-PD model, where interacting forces are not only related to normal stretch of bonds, but also related to rotation bond angles of a pair of conjugated bonds. Simple elastic-brittle bond rupture criteria, which are related to the uniaxial tensile strength and uniaxial compressive strength, are implemented into this novel conjugated BB-PD. The novel conjugated BB-PD model is found to be effective for simulating rock fracture problems under compression. Initiation and propagation of cracks in rock specimens with a single flaw are firstly studied. Then, crack initiation, propagation and coalescence of two parallel and un-parallel flaws under uniaxial compression are investigated. Meanwhile, effects of flaw inclination angles and rock bridge angles on crack propagation and coalescence behaviors are analyzed. Finally, characteristics of crack coalescence modes are discussed, which reveals the crack coalescence mechanism of pre-flawed rock specimens under uniaxial compression. Comparing the present numerical results with the previous experimental observations and other numerical results, it can be found that the present numerical results are in good agreement with the experimental observations. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：614 / 643
页数：30
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