人民长江2016，Vol.47Issue(22)：87-91,5.DOI:10.16232/j.cnki.1001-4179.2016.22.019
单轴压缩下不同裂隙张开度岩石破坏数值模拟
Numerical simulation of failure mechanism of fractured rock with different apertures under uniaxial compression
摘要
Abstract
In order to study the mechanical behavior of fractured rock mass with different apertures in the process of uniaxial compression, based on a set of micro-parameters that are calibrated by laboratory experiment of fractured sandstone specimen, a modified Rigid Body Spring Method ( RBSM) is used to simulate the failure process of jointed rock with different fracture aper-tures. The results show that with the increase of fracture apertures, the peak strength of jointed rock mass firstly increases and then decreases, but finally maintains stability. The failure modes of jointed rock mass with different fracture apertures are catego-rized into 3 types according to the initiation position of the micro crack. Furthermore, we reach a conclusion that the ultimate fail-ure is essentially caused by tension stress no matter what type of the failure mode is. As axial strain continues to rise, the develo-ping rate of micro cracks within the specimen gradually increases, however the number of shear cracks is far less than the tension cracks. Finally, the meso-mechanism of micro cracks initiation is revealed by the evolution of the displacement field.关键词
岩石力学/裂隙张开度/破坏模式/裂纹扩展/刚体弹簧方法Key words
rock mechanics/fracture aperture/failure mode/crack propagation/RBSM分类
天文与地球科学引用本文复制引用
牛江瑞,黄昆,姚池,杨建华..单轴压缩下不同裂隙张开度岩石破坏数值模拟[J].人民长江,2016,47(22):87-91,5.基金项目
国家重点基础发展规划计划“973”项目(2011CB013506) （2011CB013506）
国家自然科学基金资助项目(51409138) （51409138）
江西省自然科学基金资助项目(20151BAB213026) （20151BAB213026）
