中厚煤层坚硬顶板切顶留巷关键技术参数研究及应用
Key technical parameters for roof cutting retained roadways in medium-thick coal seams with hard roof
马跃 1陈胜焱 2宫晨耀 2刘星宇2
作者信息
- 1. 安徽宿州煤电集团有限公司 界沟煤矿,安徽 宿州 234000
- 2. 中国矿业大学 矿业工程学院,江苏 徐州 221116
- 折叠
摘要
为确定中厚煤层坚硬顶板条件下切顶留巷关键技术参数,以安徽宿州界沟煤矿 1026工作面运输巷道为工程背景,建立了坚硬顶板切顶留巷力学模型,采用理论分析、数值模拟及现场试验等方法,明确了切顶高度、角度与钻孔间距对切顶效果的影响规律,确定了 1026 工作面运输巷道合理切顶留巷关键技术参数:切顶高度10 m、切顶角度0°以及钻孔间距0.5 m.现场实测结果显示,1026 工作面运输巷道留巷段累计顶板下沉量 170～250 mm,采空区侧与实体煤侧液压支架滞后工作面180～200 m压力值稳定,锚索锚固有力,切顶留巷效果良好.研究成果可为相似工程地质条件矿井切顶留巷关键技术参数确定提供有益参考.
Abstract
To determine the key technical parameters for roof cutting retained roadways in medium-thick coal seams with hard roof,we took the transport roadway of No.1026 working face at Jiegou Coal Mine in Suzhou,Anhui,as the engineering example.A mechanical model for hard roof cutting retained roadway was established.In terms of theoretical analysis,numerical simulation,and on-site experiments,we clarified the influence of cutting height,cutting angle,and borehole spacing on the roof cutting.Key technical parameters for roof cutting retained roadway in the transport roadway of No.1026 working face were defined as follows:a cutting height of 10 m,a cutting angle of 0°,and a borehole spacing of 0.5 m.Field measurements demonstrate that the cumulative roof subsidence in the retained section of No.1026 face transport roadway ranges from 170 mm to 250 mm.The hydraulic supports on the goaf side and the solid coal side are 180～200 m behind the working face,with stable pressure,and strong anchor bolts,resulting in a good roof cutting retained roadway condition.The findings of this study provide a valuable reference for determining key technical parameters for roof cutting retained roadways under similar geological conditions.
关键词
切顶留巷/中厚煤层/坚硬顶板/合理切顶参数Key words
roof cutting retained entry/medium-thick coal seams/hard roof/reasonable roof cutting parameters引用本文复制引用
出版年
2024
NETL
NSTL
万方数据