摘要
济宁二号煤矿φ2500 mm通风立孔施工完成后即出现围岩剥落现象,且伴随有淋水,2 a多时间即失去通风功能。采用自主设计的空间扫描设备对通风孔围岩剥落现状进行探测,发现围岩存在严重的孔壁围岩剥落、垮落现象。分析发现通风孔围岩剥落的原因为孔壁未支护的泥质岩,在淋水软化及高速风风化作用下,岩层稳定性大幅降低,进而剥落、垮落。通风立孔采用“下口挡墙+下段充填封堵”的处理方案,挡墙与被注浆充填加固的巷道及通风孔复合形成阻挡结构,实现防隔水煤(岩)柱功能,防止通风孔淤积的碎石、积水溃出,有效消除了安全隐患。济宁二号煤矿通风立孔围岩剥落现象的发生及治理过程可为类似灾害的防治提供借鉴。
The vent hole of Jining No.2 coal mine appeared the phenomenon of surrounding rock spalling,accompanied by the phenomenon of water outlet,which lost its function in more than two years.The space scanning equipment was used to detect the current situation of the surrounding rock exfoliation in the ventilation hole,and it was found that the surrounding rock exfoliation and collapse were serious.The analysis found that the reason for the spalling of the surrounding rock is the mudstone whose hole wall is not supported.Under the effect of softening and weathering,the stability of the rock layer is greatly reduced,and then spalling and collapse.The ventilation hole adopts the treatment scheme of"retaining wall+grouting sealing".The retaining wall and the ventilation hole filled with grouting form a blocking structure to prevent the gravel and water deposited in the vertical hole from falling out,effectively eliminating the potential safety hazard.The experience of treating ventilation holes in Jining No.2 coal mine can provide reference for the prevention and control of similar disasters.
作者
周恒心
钱自卫
程继东
胡陈
ZHOU Hengxin;QIAN Ziwei;CHENG Jidong;HU Chen(Jining No.2 Coal Mine,Shandong Energy Yankuang Energy Group Co.,Ltd.,Jining 273500,China;School of Resources and Earth Sciences,China University of Mining and Technology,Xuzhou 221116,China;Xuzhou Zhongkuang Geological Science and Geotechnical Engineering Technology Co.,Ltd.,Xuzhou 221000,China)
出处
《煤炭技术》
CAS
北大核心
2023年第1期203-207,共5页
Coal Technology
基金
中央高校基本科研业务费专项资金资助项目(2020ZDPYMS11)。
关键词
通风立孔
围岩剥落
探测
封堵
vent hole
surrounding rock spalling
detection
grouting seal
