摘要
榆神府矿区煤层顶板属于非坚硬岩层,但由于工作面初次来压步距很大,单体液压支柱无法抗拒覆岩整体切落和大面积垮落压力而容易引发大面积垮落灾变。数值模拟分析表明,非坚硬顶板工作面初次来压步距可以通过深孔和浅孔强制放顶减小。通过数值模拟和实际开采条件分析,提出了采用深浅孔结合进行强制放顶预防大面积垮落灾变的方法。得到了炮眼直径与最小抵抗线的关系,确定了非坚硬顶板强制放顶的爆破参数,为避免顶板大面积垮落灾变提供了可靠依据。
The mechanics intensity in the Yu-Sheng Coalfield is not great,it belongs to the non-hardy roof. But the main roof at the first weighting is very big. The individual jacks can not dispute the pressure which is caused by the over burden＇s holistic collapse and the massive collapse of the main roof,it easily initiates the working face always emerge massive collapse catastrophe. Numerical simulation indicates it is feasible nature to reduce collapse distance at the first time in the face with deep and shallow blasting. Through numerical simulation and mining analysis,the compulsive roof cave-in method to avoid massive collapse catastrophe is brought forward. The relationship between the minimum resistance line and the diameter is obtained,and the reasonable blasting parameters is confirmed,providing a reliable basis to avoid massive collapse catastrophe.
出处
《西安科技大学学报》
CAS
北大核心
2010年第3期287-290,323,共5页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金资助项目(40572155)
陕西省教育厅专项科研计划项目(09JK599)
西安科技大学博士启动金项目(200801)
关键词
非坚硬顶板
浅埋煤层
强制放顶
爆破参数
shallow seam
non-hardy roof
compulsive roof cave-in
blasting parameters
