某露天灰岩矿大断面硐室开挖技术  

Large Section Chamber Excavation Technology in an Open-pit Limestone Mine

作　　者：赵运涛 ZHAO Yuntao(Sinosteel Maanshan General Institute of Mining Research Co.,Ltd.;State Key Laboratory of Metal Mine Safety and Health;Huawei Metal Mineral Resources Efficient Recycling National Engineering Re-search Center Co.,Ltd.)

机构地区：[1]中钢集团马鞍山矿山研究总院股份有限公司 [2]金属矿山安全与健康国家重点实验室 [3]华唯金属矿产资源高效循环利用国家工程研究中心有限公司

出　　处：《现代矿业》2022年第8期85-87,91,共4页Modern Mining

摘　　要：某露天灰岩矿山采用平硐溜井开拓,粗碎硐室在采场底部,属高墙大跨度硐室,制定由上而下的分层施工方案。第1层利用施工支硐全断面开挖,开挖完成后对拱顶混凝土衬砌,采用锚杆对衬砌和岩壁进行刚性粘结,拱脚采用“岩锚梁”形式进行支撑。第2~4层采用先中间拉槽、后两侧光面爆破成型的方法,开挖完成后对硐室衬砌。此方案相较于无轨盘旋斜坡道开挖节省施工时间,且第一层施工完成后,后续施工均在钢筋混凝土穹顶的保护下进行,极大提高了施工安全性。An open-pit limestone mine is developed with a flat tunnel,and the coarse crushing chamber is at the bottom of the stope,which is a high-wall and large-span chamber,and a top-to-bottom layered construction plan is formulated.The first floor is excavated with the full section of the construction support.After the excavation is completed,the vault is lined with concrete,and the lining and the rock wall are rigidly bonded with anchor rods,and the arch feet are supported in the form of"rock anchor beams".The second,third and fourth floors adopt the method of pulling the groove in the middle first,and then blasting the two sides with smooth surface.After the excavation is completed,the chamber is lined.Compared with the excavation of the trackless spiral ramp,this solution saves construction time,and after the completion of the first floor construction,the subsequent construction is carried out under the protection of the reinforced concrete dome,which greatly improves the construction safety.

关 键 词：大断面硐室开挖 分层开挖 岩锚梁 穹顶 

分 类 号：TD354[矿业工程—矿井建设] TD872.5