期刊
COMPUTERS AND GEOTECHNICS
卷 45, 期 -, 页码 19-33出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2012.04.011
关键词
Surface flaw; Heterogeneity; Mode III fracture; Three-dimensional model; Finite element; Wing cracks
类别
资金
- National Program on Key Basic Research Project of China (973 Program) [2011CB013500]
- National Natural Science Foundation of China [51121005, 51079017, 50820125405, 51004020]
- Foundation for the Author of National Excellent Doctoral Dissertation of PR China [200960]
- Program for New Century Excellent Talents in University [NECT-09-0258]
- ARC CoE Early Career Award [CE110001009]
Three-dimensional surface crack initiation and propagation in two kinds of heterogeneous rocks were numerically investigated via parallel finite element analysis using a supercomputer. Numerically simulated rock specimens containing a pre-existing flaw were subjected to uniaxial compression until failure. The initiation and propagation of wing cracks, anti-wing cracks, and shell-like cracks were reproduced by numerical simulations. The numerically simulated results demonstrate that the further propagation of wing cracks and shell-like cracks stop due to their wrapping (curving) behavior in three-dimensional spaces, even if the applied loads continue to increase. Furthermore, rock heterogeneity could significantly influence crack propagation patterns and the peak uniaxial compressive strengths of rock specimens. Moreover, anti-wing cracks only appeared in relatively heterogeneous rocks, and the peak uniaxial compressive strengths of the specimens were observed to depend on the inclination of the pre-existing flaw. Finally, the mechanism of surface crack propagation is discussed in the context of numerically simulated anti-plane loading tests, wherein it was identified that Mode III loading (anti-plane loading) does not lead to Mode III fracture in rocks due to their high ratio of uniaxial compressive strength to tensile strength. This finding could explain the lateral growth of an existing flaw in its own plane, which is a phenomenon that has not been observed in laboratory experiments. (C) 2012 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据