工程科学学报2017，Vol.39Issue(12)：1791-1801,11.DOI:10.13374/j.issn2095-9389.2017.12.003
含孔洞大理岩破坏特性的颗粒流分析
Particle flow analysis of fracture characteristics of marble with a single hole
摘要
Abstract
Based on uniaxial compression laboratory results, the failure process of marble with a single hole was simulated using the particle flow code PFC2D under uniaxial and biaxial compressions. The influence of the pre-existing hole shape, confining pressure and the rock heterogeneity on the mechanical properties of marble and the coalescence of cracks was analyzed. Numerical results show that compared to an intact marble specimen, the peak strength of a specimen containing a single hole reduces significantly, and the ex-tent of reduction is related to the hole shape. The confining pressure has a significant effect on the mechanical properties of marble and the coalescence of cracks. The peak strength increases with the increase of confining pressure, while the peak deviator stress increases first and then decreases with the confining pressure increasing. Specimens containing circular holes exhibit X-type shear failure, while specimens containing rectangular or U-shaped holes exhibit diagonal shear failure. The mineral nodules in the rock specimen signifi-cantly affect the propagation of cracks leading to a change in the failure mode of marble specimen. Analysis results of the microscopic mechanisms show that the initiation and propagation of cracks around the hole is always accompanied by the release and transfer of stress from a concentrated zone. Three types of macroscopic cracks can be classified in specimen containing a single hole as hole sur-face spalling, tensile crack, and compressive shear crack.关键词
颗粒流程序/孔洞试样/裂纹扩展/岩石非均质性/双轴压缩Key words
particle flow code ( PFC)/single hole specimen/crack propagation/rock heterogeneity/biaxial compression分类
建筑与水利引用本文复制引用
黎崇金,李夕兵,李地元..含孔洞大理岩破坏特性的颗粒流分析[J].工程科学学报,2017,39(12):1791-1801,11.基金项目
国家自然科学基金资助项目(11472311, 41630642) （11472311, 41630642）
中南大学中央高校基本科研业务费专项资金资助项目(2017zzts538) （2017zzts538）
