摘要
本文以6303综放工作面回采为工程背景,采用钻探方法确定下覆9#煤层采空区位置,并通过理论及数值模拟技术对工作面回采期间底板稳定性进行分析,给出采空区加固技术方案并进行工程应用。研究发现:①工作面回采后底板塑性区与下覆采空区顶板联通、底板稳定性较差,而对采空区进行加固后工作面底板稳定性得以明显提出;②在分析现有加固材料基础上,发现空巷充填材料不仅可满足采空区加固需要,而且可降低加固成本、加固工程施工量;③结合6303综放工作面回采巷道及探测巷道布置情况具体给出加固钻孔布置方案、充填工艺及安全技术措施等。工程应用后,6303综放工作面回采过下覆9#煤层采空区时工作面底板及综放设备等保持稳定,开采设备、顶底板、矿压等均未出现异常,表明采用的加固技术效果显著。
Ensuring the stability of the bottom plate is the foundation for achieving safe coal mining in the fully mechanized top coal caving face.However,when there is a goaf underneath the mining area,the mining face often faces problems such as roof collapse and instability of the fully mechanized top coal caving equipment,which greatly restricts the safe coal mining and is a key problem that mines need to solve.Taking the 6303 fully mechanized mining face as the engineering background,the drilling method was used to determine the position of the overlying 9#coal seam goaf,and the stability of the bottom plate during the mining face recovery period was analyzed through theoretical and numerical simulation technology.A reinforcement technology scheme for the goaf was proposed and applied in engineering.The research found that:①the plastic zone of the bottom plate after the mining face recovery is connected to the overlying goaf roof,and the stability of the bottom plate is poor,After reinforcing the goaf,the stability of the working face bottom plate can be significantly improved;②Based on the analysis of existing reinforcement materials,it was found that the filling material for the goaf can not only meet the reinforcement needs of the goaf,but also reduce the reinforcement cost and construction volume of the reinforcement project Provide a specific reinforcement drilling layout plan,filling process,and safety technical measures based on the layout of the mining roadway and detection roadway in the 6303 fully mechanized mining face.After engineering application,when the 6303 fully mechanized mining face passed through the goaf of the overlying 9#coal seam,the working face floor and fully mechanized mining equipment remained stable,and there were no abnormalities in the mining equipment,roof and floor,and mine pressure,indicating that the reinforcement technology used had a significant effect.
出处
《中国矿山工程》
2023年第6期40-44,50,共6页
China Mine Engineering
关键词
综放开采
底板稳定
下覆采空区
注浆加固
fully mechanized caving mining
bottom plate stability
underlying goaf
grouting reinforcement
