摘要
深井巷道底鼓现象十分普遍,其中滑移型底鼓治理难度大。以羊东矿-850水平北翼轨道大巷为背景,研究了轨道大巷强烈大变形规律,分析了巷道底板滑移破坏机理,提出巷道底板钢管混凝土桩抗滑抑制底鼓技术,并利用数值模拟方法分析了不同支护密度下抗滑桩控制底鼓效果。结果表明:高应力场环境、岩石黏土矿物含量高、裂隙水与工程积水,是导致岩石崩解破坏、巷道围岩大变形及强烈底鼓的主要因素;控制底板岩层滑移面形成及增加滑移面抗剪切强度是抑制滑移型底鼓的关键;钢管混凝土桩兼具抑制滑移面形成和提高滑移面部位强度的作用;随着抗滑桩布置密度的增加,巷道底鼓量与巷道底板破坏深度随之减小,在一定支护密度下巷道底板破坏深度趋于稳定;抗滑桩由外至里受力呈拱形分布,桩支护密度大时桩受力小,巷道底板中部或里侧桩受力大于两侧桩。现场试验表明:巷道底鼓得到了有效控制,能够满足生产运输的正常使用。
Floor heave is common in deep mine roadways,and the sliding floor heave is particularly difficult to control.The large deformation of the north wing level main track roadway at-850 level of of Yangdong Mine was studied,to analyze the mechanism of sliding failure of roadway floor.It was proposed to use concrete-filled steel tube piles for floor heave control,and numerical simulation was used to analyze the effect of anti-sliding piles with various support densities.The experimental results show that the high stress environment,high clay content of the stratum,and the accumulation of cracks and water were the main factors that causing the rock disintegrating,roadway large deformation and strong floor heave.Concrete-filled steel tube piles prevents the formation of a slip surface and improves the strength of the sliding face.When the arrangement density of the anti-sliding piles increases,the floor heave of the roadway gradually drops.The depth of the floor heave damage decreases and stabilizes under certain arrangement densities.Interestingly,the force on each pile increases toward the center of the arrangement,which suggests that if the pile arrangement density is higher,the force on each pile will be lower,and the force on the piles in the middle,or inside of the roadway floor,will be larger than that of the piles on either side.The results indicates that the floor heave of the roadway can be effectively controlled,allowing normal mining operations to resume.
作者
冯利宁
丁斌
孙利辉
张海洋
杨江华
王中海
FENG Lining;DING Bin;SUN Lihui;ZHANG Haiyang;YANG Jianghua;WANG Zhonghai(Jizhong Energy Handan Ming Industry Group,Handan 056002,China;College of Mining and Geomatics Engineering,Hebei University of Engineering,Handan 056038,China;School of Civil and Resource Engineering,University of Science and Technology-Beijing,Beijing 100083,China;Yunjialing Mine,Heibei Jizhong Hanfeng Mining Co.,Ltd.,Handan 056302,China)
出处
《煤炭工程》
北大核心
2023年第4期58-64,共7页
Coal Engineering
基金
国家自然科学基金项目(52074100,51874113)
河北省重点研发计划项目(19275508D)
矿山地质灾害成灾机理与防控重点实验室开放基金项目(KF2018-07)。
关键词
深井巷道
高应力场
滑移型底鼓
钢管混凝土桩
抗滑移
deep mine roadway
high stress field
sliding floor heave
concrete-filled steel tube pile
anti-sliding
