Fracture Mechanics Analysis on Composite Macro-Cracks Extension in Coal Seam Pre-splitting Blasting

摘要：

During Pre-splitting Blasting in coal seam, the macro-cracks coming from blasting shock wave are composite ones in fact, however, for most oftbe fundamental researches, attention was concentrated on simplex mode-! fracture and the influence of methane pressure was ignored. According to fracture mechanics theories, this paper analyzed detailedly the characteristics of stress field and intensity factors ahead of crack tip, and educed extension directions, fracture roles and extension length of the macro-cracks by most-shear stress principle. Taking account of practice application in spot, maximal length and minimal length were working-out. Such a study will be significant not only for perfecting more the theory of pre-splitting blasting in coal seam but also for serving practice application.

关键词： pro-splitting blasting composite macro-cracks fracture mechanics most-shear stress crack extension

作者: WANG Zhiliang ZHOU Xinquan XU Jingde

作者单位: School of Energy and Safety Engineering,China University of Mining and Technology (Beijing),Beijing School of Energy and Safety Engineering,China University of Mining and Technology (Beijing),Beijing Training Department of North China Institute of Science and Technology,Yanjiao Beijing-East 101601,C

会议类型: 国际会议

会议名称: The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)

会议地点: 北京

会议语种:英文

页码: 1593-1597

在线出版日期: 2008-09-24（万方平台首次上网日期，不代表论文的发表时间）