摘要
为了进一步认清在钻孔施工过程中经常出现卡钻、喷孔等问题,本文以掘进面施工防突钻孔为例,以理论分析为主要手段,建立了钻孔失稳的力学模型,分别研究了钻孔孔底和孔壁附近煤体的破坏形式和失稳特征,并结合钻孔喷孔应具有两个基本条件:①封存的能量源;②封存障碍突然失稳破坏,而使能量源瞬间释放,得出如下结论:卸压区易发生垮孔;峰后应力集中区易垮孔也易发生喷孔;而峰值强度前区域发生喷孔的概率则大大降低.
In order to get a better understanding of sticking and spraying orifice in the process of drilling, taking operation drilling for outburst control for example, the mechanical model for borehole instability of drilling is established based on theoretical analysis. Failure forms and characteristics of the drilling-bottom and drilling-wall were studied separately. The result indicates that there were two basic conditions for spraying orifice, （1）the sealed source of energy, and （2） the sudden failure of sealing which causing the sealed energy released transiently. So we can concluded that breaking drilling and orifice spraying are likely to take place in the stress concentrated region after peak intensity and the probability of orifice spraying greatly decreases before the peak intensity.
出处
《采矿与安全工程学报》
EI
北大核心
2008年第4期444-448,共5页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2005CB221504
2006CB202204)
国家自然科学基金重点项目(50534080)
关键词
防突钻孔
卸压区
失稳
应力梯度
峰值强度
drilling for outburst control
the region of stress-relief
instability
stress-gradient
peak intensity
