赵楼煤矿综放工作面过老巷道安全技术方案优化
2021-08-24刘磊孙建华宾海雄简俊常
刘磊 孙建华 宾海雄 简俊常
摘 要:由于矿井地质条件复杂,采煤工作面往往布置有老巷道,且巷道位置关系比较复杂,为使采煤工作面安全通过其回采范围内的老巷道,本文针对赵楼煤矿5301综放工作面中间巷的位置关系,提出针对性的过老巷措施,有效控制了工作面顶板,保证工作面过老巷安全回采,为今后工作面过老巷提供了技术参考。
关键词:综放工作面;老巷道;顶板
中图分类号:TD353文献标识码:A文章编号:1003-5168(2021)10-0063-03
Optimization of Safety Technical Scheme for Passing Old tunnel in Fully Mechanized Caving Face of Zhaolou Coal Mine
LIU Lei SUN Jianhua BIN Haixiong JIAN Junchang
(Zhaolou Coal Mine,Yuncheng Shandong 274705)
Abstract: Because of the complex geological conditions of the mine, the old tunnels are often arranged in the coal mining face, and the location relationship of the tunnels is relatively complex. In order to make the coal mining face pass through the old tunnels within the mining area safely, this paper put forward the pertinent measures for the old tunnels in the middle tunnel of 5301 fully mechanized top-coal caving face of Zhaolou Coal Mine and effectively controls them. The roof of the working face ensures the safe mining of the working face through the old tunnel, and provides a technical reference for the future working face through the old tunnel.
Keywords: fully mechanized top-coal caving face;old tunnel;roof safety
1 综放工作面概况
5301综放工作面是赵楼煤矿五采区首采工作面,工作面长195.5 m,推进長度1 328.6 m,平均煤厚6.48 m,可采储量190.9万t。由于工作面涌水量较大(150~290 m3/h),因此,工作面中部设计有泄水巷,贯穿两顺槽(运顺收尺点775 m,轨顺收尺点890 m),与顺槽夹角60°,全长225 m(如图1所示)。泄水巷为矩形断面,净断面宽3.0 m,高3.0 m,采用锚网索带联合支护。运顺侧标高-896.7 m,轨顺侧标高-911.0 m,高差14.3 m。
泄水巷内布置有QBW-100-110-75型泵2台,MD-280-43X4-250型卧泵1台,备用QBW-100-110-75型泵2台,MD-280-43X4-250型卧泵1台,并有1部煤泥清理装置(40 t溜子),工作面正常生产时经泄水巷排水。
2 老巷道提前支护方案
随着工作面的推进,需要提前对泄水巷进行支护。经设计优化,计划在巷道顶板打密集锚索支护,代替传统的打木垛或充填支护[1]。锚索间排距及布置方式如图2所示,最后形成4-3-4五花布置形式。
泄水巷密集锚索支护质量要求[2-4]:①把所有的活岩危矸找出来,并清理干净,在金属网锈蚀严重部位需要重新挂网;②锚索预紧力不得小于100 kN,锚固力不得小于180 kN,间排距不大于设计的±150 mm,锚索外露长度150~250 mm,锚索安装角度要垂直于巷道顶板,托盘压紧钢带,使钢带紧贴顶板,托盘安装完毕后立即预紧锚索。……
