摘要
神山灰岩矿溜井底部储矿仓在掘进完成后发生垮塌,破碎硐室顶拱中部塌落呈倒置漏斗状空腔,该处锚网支护系统损毁失效,漏斗状空腔边沿悬挂已失稳未完全垮落岩体,存在再次塌方隐患。主要原因为岩体自稳能力差,同时在溜井储料仓爆破开挖过程中,对岩体带来扰动。根据现场实际情况,采用自上而下的原则,对垮塌区域上部岩体采用长锚杆加固,然后对垮塌区域顶板进行喷射混凝土支护,采用长锚杆+网喷对当前垮塌空区顶板进行加固。实践表明:采用回填粗砂的方式进行垮塌区处理施工,可保证空顶下作业安全;采用涨壳式预应力锚杆,可及时控制垮塌区继续发展,能够有效保证顶板安全。本方案对于处理较大垮塌空区有良好的工程借鉴经验。
The storage bin at the bottom of the chute in Shenshan Limestone Mine are collapsed after the completion of excavation.The collapse of the middle part of the roof arch of the crushed chamber shows an inverted funnel-shaped cavity.The bolt-mesh support system was damaged and failed at this site.The rock mass suspended along the edge of the funnelshaped cavity was unstable and incompletely collapsed,so there was a hidden danger of secondary collapse.The main reason for that above is the poor self-stability of rock mass,and disturbance to rock mass during the blasting excavation of storage bin at chute.According to the actual situation of the site,the principle of from top to down is adopted to reinforce the upper rock mass of collapse area with long bolts.Shotcrete support for roof in collapsed area are used to make the roof reinforcement at the current collapsed goaf by long-bolt and net spraying.Practice shows that the safe operation under the goaf roof can be guaranteed by using coarse sand backfilling to deal with the collapsed area.Continuous development of collapsed area can be controlled in time by using shell-expanding prestressing bolt.This scheme effectively ensures the safety of roof and has good engineering experience for dealing with large-scale collapsed goaf.
作者
练兰英
李中楠
Lian Lanying;Li Zhongnan(School of Civil Engineering,Wanjiang University of Technology,Maanshan 243000,China;Sinosteel Maanshan Institute of Mining Research Co.,Ltd.,Maanshan 243000,China)
出处
《金属矿山》
CAS
北大核心
2019年第8期50-53,共4页
Metal Mine
关键词
储矿仓垮塌
硐室空腔
支护设计
充填加固
Collapse of ore storage bin
Cavity
Support design
Filling and reinforcement
