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金属矿山 ›› 2011, Vol. 40 ›› Issue (12): 13-17.

• 采矿工程 • 上一篇    下一篇

自然崩落法采矿矿岩崩落过程数值模拟研究

李连崇1,唐春安1,Cai Ming2   

  1. 1.大连理工大学土木工程学院;2.Laurentian University,Sudbury,Canada
  • 出版日期:2011-12-13 发布日期:2011-12-14
  • 基金资助:

    * 国家自然科学基金重大国际合作项目 (编号:50820125405),国家自然科学基金青年基金项目(编号:50909013)。

Numerical Study on Caving State of Overlying Rock and Orebody by Caving Method

Li Lianchong1,Tang Chunan1,Cai Ming2   

  1. 1.School of Civil Engineering,Dalian University of Technology;2.Laurentian University,Sudbury,Canada
  • Online:2011-12-13 Published:2011-12-14

摘要: 由崩落法开采引起的矿岩崩落及其诱发的地表沉陷是一个复杂的空间与时间关系问题。以CEMI的“矿块崩落与地表沉陷模拟”项目为研究背景,利用数值模拟方法研究了深部、大规模自然崩落开采矿岩崩落的基本规律。数值模拟捕捉到了矿岩崩落过程中压力平衡拱的演化,以及裂隙萌生、扩展、贯穿岩桥的过程,研究表明,压力平衡拱的动态演化是矿岩崩落出现间歇和跳跃的内在动因,陷落角、起裂角和地表沉陷模式都受控于矿岩的崩落状态。

关键词: 崩落法, 地表沉陷, 应力演化, 数值模拟

Abstract: The caving of overlying rock and orebody,and associated ground surface subsidence is a complex issue involving time and space.Based on the project of “Modelling Block Caving to Surface” proposed by CEMI,numerical investigations were conducted on the caving state and ground surface subsidence involving deep and large-scale caving.The evolution of pressure equilibrium arch and the fracturing process in rock mass were numerically obtained.It is shown that evolution of pressure equilibrium arch is the triger of caving with intermission and jump.The break angle,fracture initiation angle and associated ground surface subsidence are all depended on the caving state of overlying rock and orebody.

Key words: Caving method, Subsidence of ground surface, Evolution of stress, Numerical simulation