摘要
陕西彬长大佛寺煤矿井下近距离煤层开采过程中,上煤层开采完毕后底板应力影响下煤层巷道稳定性,巷道围岩变形严重,已严重影响了下煤层采掘工作面的安全高效生产。为了解决近距离煤层开采巷道稳定性控制难题,采用理论分析、钻孔窥视分析,现场锚杆锚索支护质量调查研究,分析下煤层巷道围岩变形影响因素。研究结果表明:上煤层底板破坏影响深度为26.4 m;钻孔窥视分析得出顶板围岩完整性好于帮部围岩完整性,帮部围岩松动圈范围在3.3 m之内且煤柱侧大于工作面侧;锚索支护质量调查得出帮部锚索初锚力不合格率高,施工工艺差。通过加强帮部支护强度,提高锚索锚固力,优化锚网索支护参数,分段补强支护,提高钻孔施工质量等手段,从而控制巷道围岩变形。监测信息反馈表明,该技术能完全控制巷道围岩变形,保证了回采巷道在服务期内不扩修,为工作面的安全高效回采提供了必要的基础条件。
In the process of underground close coal seam mining in Dafosi Coal Mine of Binchang,Shaanxi Province,the floor stress after the upper seam mining affects the stability of the lower seam road⁃way,and the surrounding rock deformation of the roadway is serious,which has seriously affected the safe and efficient production of the lower seam mining face.In order to solve the problem of roadway stability control in close coal seam mining,the influencing factors of surrounding rock deformation in the lower coal seam roadway are analyzed by theoretical analysis,borehole peeping analysis,and on-site investigation and Study on the quality of bolt and cable support.The results show that the influence depth of the upper coal seam floor is 26.4m.The borehole peeping analysis shows that the integrity of the surrounding rock of the roof is better than that of the surrounding rock of the wall.The loose zone of the surrounding rock of the wall is within 3.3m and the coal pillar side is larger than the working face side.According to the quality in⁃vestigation of anchor cable support,the initial anchor force of the side anchor cable is not qualified,and the construction technology is poor.By strengthening the support strength of the side,improving the anchor⁃ing force of the anchor cable,optimizing the support parameters of the anchor mesh cable,strengthening the support in sections,and improving the drilling construction quality,the deformation of the surrounding rock of the tunnel can be controlled.The monitoring information feedback shows that the technology can completely control the deformation of the surrounding rock of the roadway,ensure that the mining roadway will not be expanded within the service period,and provide the necessary basic conditions for safe and effi⁃cient mining of the working face.
作者
商伐
卓青松
胡烈飞
SHANG Fa;ZHUO Qingsong;HU Liefei(Shaanxi Binchang Dafosi Mining Co.,Ltd.;College of Energy,Xi'an University of Science and Technology)
出处
《现代矿业》
CAS
2022年第9期222-227,共6页
Modern Mining
关键词
近距离煤层
巷道变形
钻孔窥视
监测分析
close coal seam
roadway deformation
borehole peeping
monitoring analysis
作者简介
商伐(1986—),男,业务主管,工程师,713500陕西省咸阳市。
