煤矿安全2019，Vol.50Issue(12)：76-80,5.DOI:10.13347/j.cnki.mkaq.2019.12.017
三软煤层大跨度切眼掘进及围岩控制技术
Large-span Open-hole Tunneling in Three Soft Coal Seams and Its Surrounding Rock Control Technology
丁国峰 1黄克军 2金声尧1
作者信息
- 1. 陕西煤业化工技术研究院有限责任公司,陕西 西安 710065
- 2. 煤炭绿色安全高效开采国家地方联合工程研究中心,陕西 西安710065
- 折叠
摘要
Abstract
In order to solve large span open-off excavation and support problems in three soft coal seam mine, according to the structural characteristics of roof, mechanical characteristics and stability of the main factors, we built a limit span roof strata mechanical model and obtained limit span roof calculation formula. At the same time, on the basis of studying the causes of easy falling of the roof of the cut hole, the L-shaped cut hole driving technology and surrounding rock supporting technology are proposed, and the deformation characteristics of surrounding rock of the cut hole under three different excavation methods, such as once-tunneling, secondary piloting tunnel and L-shaped cut hole, are compared and analyzed by numerical simulation. The results show that L-shaped hole cutting technology can effectively ensure the roof safety during hole cutting in three soft coal seams. The field test shows that the technology of grouting and anchor wire can control the deformation of surrounding rock with large span cut in three soft coal seams.分类
矿业与冶金引用本文复制引用
丁国峰,黄克军,金声尧..三软煤层大跨度切眼掘进及围岩控制技术[J].煤矿安全,2019,50(12):76-80,5.
