【作者】 张吉宏； 刘红岩；

【Author】 ZHANG Ji-hong~(1,2),LIU Hong-yan~(3,4) (1.School of Geology Engineering and Geomatics,Chang’an University,Xi’an 710064, China;2.Xi’an Engineering Investigation and Design Research Institute of China National Non-ferrous Metals Industry,Xi’an 710064,China;3.College of Engineering & Technology,China University of Geosciences,Beijing 100083,China;4.School of Engineering,Tibet University,Lasha 850000,China)

【机构】 长安大学 地质工程与测绘学院； 中国有色金属工业西安勘察设计研究院； 中国地质大学 工程技术学院； 西藏大学 工学院；

【摘要】 针对目前常用的有限元和离散元等数值方法难以客观反映岩体中存在的大量断续节理和在外力作用下岩体破碎及块体运动的不足,提出了采用数值流形方法以解决目前岩体爆破模拟中存在的上述问题。数值流形方法采用数学网格与物理网格以形成求解流形单元,因而很容易反映岩体中存在的众多初始节理,采用断裂力学准则以模拟节理、裂纹扩展,采用DDA中的块体运动学理论以模拟块体运动。最后通过算例对比分析了完整岩体和节理岩体爆破破坏模式的差异,说明了节理存在对岩体爆破破坏模式有着重要影响,且其影响程度与节理的几何分布及物理力学性质有着密切关系。更多还原

【Abstract】 Due to the shortcomings existed in finite element method and discrete element method in practice, many intermittent joints cannot be reflected objectively and fragmentation of rock mass and rock block movement cannot be simulated,then the numerical manifold method is adopted to solve the problems existed above in rock mass blasting.Numerical manifold method adopts mathematical mesh and physical mesh to form the solved manifold element, which can easily reflect the original joints existed in rock mass.Meanwhile,it adopts fracture mechanics principle to simulate the propagation of the joint and crack,and block movement theory in DDA to simulate the block movement.Finally.an calculation example is used to analyze the difference of failure modes between intact and jointed rock mass,and the results show that the existence of joints has much effect on rock mass blasting failure mode,which is much related to the joint’s geometry distribution and physical and mechanical propeny.更多还原