摘要
针对深井巷道原支护方案返修后顶板稳定性难以维持的工程难题,通过围岩破坏分区探测、理论分析顶板围岩破坏规律及推导考虑锚索长度的支护承载计算公式,提出“注浆加固浅层破碎围岩+加长锚索深部控顶”的返修支护方案并开展现场工业性试验。研究表明:围岩严重破坏区距硐壁平均3.44 m,锚杆全部处于该区域内;中等破坏区距硐壁平均6.04 m,接近锚索长度;轻微破坏区距硐壁平均7.56 m,超出锚索长度。数据表明原方案支护参数不合理。注浆工艺可有效提升岩体力学参数、增加支护阻力,配合合理的锚索长度与间排距设计能充分发挥锚索支护承载能力,提高顶板稳定性。优化确定的9200 mm长度、160 kN预紧力、800 mm×800 mm间排距锚索支护参数,较矿方原返修方案实现锚索受力均值提升至210 kN以上,支护潜力得到有效发挥,顶板总离层量降低80%以上,平均沉降量减少75%以上,顶板返修控制效果显著。
In response to the problem of difficulty in maintaining roof stability after repairs to the origi-nal support system in deep mine roadways,this study detected the damage zones of surrounding rock,theoretically analyzed roof failure mechanisms,and derived a support capacity calculation formula incor-porating cable bolt length.On this basis,it proposed a new repair scheme of“grouting for shallow frac-tured surrounding rock reinforcement+extended cables for deep roof control”,and implemented this measure on site.The following research findings were yielded:The severely damaged zone of surround-ing rock is 3.44 m from the roadway wall on average,within which all bolts are located.The moderately damaged zone is 6.04 m away from the roadway wall on average,which is close to the length of cables.The moderately damaged zone is 7.56 m from the roadway wall on average,which exceeds the length of cables.These data suggest that the original support parameters are unreasonable.Grouting improves the mechanical parameters of rock mass and increases support resistance,and an appropriate anchor cable length and spacing effectively can enhance the bearing capacity of anchor cable support and improve roof stability.The new repair scheme involves the following cable support parameters:a length of 9200 mm,a pre-tension force of 160 kN,and a spacing of 800 mmx800 mm.Compared to the original repair scheme,the new repair scheme achieves an excellent roof repair effect.To be specific,the average force on anchor cables reaches over 210 kN,demonstrating effective mobilization of support capacity.In addition,the total roof separation is reduced by more than 80%,and the average roof subsidence is reduced by over 75%.
作者
潘锐
龚伟
任明洋
程桦
孙茂如
张旬
施宗申
凡元丰
PAN Rui;GONG Wei;REN Mingyang;CHENG Hua;SUN Maoru;ZHANG Xun;SHI Zongshen;FAN Yuanfeng(Anhui Province Key Laboratory of Intelligent Geotechnics and Disaster Prevention,Anhui Jianzhu University,Hefei,Anhui 230601,China;School of Civil and Transportation Engineering,Henan University of Urban Construction,Pingdingshan,Henan 467041,China;Banji Coal Mine,Xinji Energy Co Ltd,China National Coal Group Corporation,Bozhou,Anhui 236742,China)
出处
《采矿与安全工程学报》
北大核心
2025年第4期759-767,共9页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(52374073)
安徽省高校中青年教师培养行动项目(YQZD2023052)
安徽建筑大学建筑结构与地下工程安徽省重点实验室开放课题(KLBSUE-2022-02)
中煤新集能源股份有限公司科研项目(ZMXJ-LXKY-JS-2023-15)。
关键词
深井软岩顶板
围岩破坏分区
锚索支护参数
算例分析
返修设计
deep soft rock roadway
damage zones of surrounding rock
cable support parameters
example analysis
repair design
