Cracking Processes in Rock-Like Material Containing a Single Flaw Under Uniaxial Compression: A Numerical Study Based on Parallel Bonded-Particle Model Approach

doi:10.1007/s00603-011-0176-z

	Cracking Processes in Rock-Like Material Containing a Single Flaw Under Uniaxial Compression: A Numerical Study Based on Parallel Bonded-Particle Model Approach
	Zhang, Xiao-Ping 1,2; Wong, Louis Ngai Yuen 1
刊名	ROCK MECHANICS AND ROCK ENGINEERING
	2012-09-01
卷号	45 期号:5 页码:711-737
关键词	Micro-tensile cracks Micro-shear cracks Bonded-particle model (BPM) Uniaxial compressive loading test
ISSN号	0723-2632
DOI	10.1007/s00603-011-0176-z
文献子类	Article
英文摘要	Cracking processes have been extensively studied in brittle rock and rock-like materials. Due to the experimental limitations and the complexity of rock texture, details of the cracking processes could not always be observed and assessed comprehensively. To contribute to this field of research, a numerical approach based on the particle element model was used in present study. It would give us insights into what is happening to crack initiation, propagation and coalescence. Parallel bond model, a type of bonded-particle model, was used to numerically simulate the cracking process in rock-like material containing a single flaw under uniaxial vertical compression. The single flaw's inclinations varied from 0A degrees to 75A degrees measured from the horizontal. As the uniaxial compression load was increased, multiple new microcracks initiated in the rock, which later propagated and eventually coalesced into longer macrocracks. The inclination of the pre-existing flaw was found to have a strong influence on the crack initiation and propagation patterns. The simulations replicated most of the phenomena observed in the physical experiments, such as the type, the initiation location and the initiate angle of the first cracks, as well as the development of hair-line cracks, which later evolved to macrocracks. Analyses of the parallel bond forces and displacement fields revealed some important mechanisms of the cracking processes. The first cracks typically initiated from the tensile stress concentration regions, in which the tensile stress was partially released after their initiation. The tensile stress concentration regions subsequently shifted outwards close to the propagating tips of the first cracks. The initiation and propagation of the first cracks would not significantly influence the compressive stress singularity at the flaw tips, which was the driving force of the initiation of secondary cracks. The initiation of microcracking zone consisting almost exclusively of micro-tensile cracks, and that of microcracking zone consisting of micro-tensile cracks and mixed micro-tensile and shear cracks, were found to be correlated with two distinct types of displacement fields, namely type I (DF_I) and type II (DF_II), respectively.
WOS关键词	TOMOGRAPHY CT EXPERIMENTS ; ACOUSTIC-EMISSION ; BRITTLE-FRACTURE ; CARRARA MARBLE ; MOLDED GYPSUM ; TRIAXIAL COMPRESSION ; DAMAGE EVOLUTION ; COALESCENCE ; PROPAGATION ; GROWTH
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER WIEN
WOS记录号	WOS:000308110900005
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84460]
专题	中国科学院地质与地球物理研究所
通讯作者	Wong, Louis Ngai Yuen
作者单位	1.Nanyang Technol Univ, Sch Civil & Environm Engn, Singapore 639798, Singapore 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Engn Geomech, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xiao-Ping,Wong, Louis Ngai Yuen. Cracking Processes in Rock-Like Material Containing a Single Flaw Under Uniaxial Compression: A Numerical Study Based on Parallel Bonded-Particle Model Approach[J]. ROCK MECHANICS AND ROCK ENGINEERING,2012,45(5):711-737.
APA	Zhang, Xiao-Ping,&Wong, Louis Ngai Yuen.(2012).Cracking Processes in Rock-Like Material Containing a Single Flaw Under Uniaxial Compression: A Numerical Study Based on Parallel Bonded-Particle Model Approach.ROCK MECHANICS AND ROCK ENGINEERING,45(5),711-737.
MLA	Zhang, Xiao-Ping,et al."Cracking Processes in Rock-Like Material Containing a Single Flaw Under Uniaxial Compression: A Numerical Study Based on Parallel Bonded-Particle Model Approach".ROCK MECHANICS AND ROCK ENGINEERING 45.5(2012):711-737.