动压影响底板巷道失稳特征及控制技术

Instability Characteristics and Control Technology of Floor Roadway Affected by Dynamic Pressure

为保证东庞矿11采区轨道大巷的稳定,采用现场调研、理论分析、钻孔窥视、井下工业性试验等方法,开展了动压巷道围岩加固技术的研究。主要的研究结论:邻近工作面回采、支护密度及施工方式等是造成巷道大变形的主要因素;21111工作面底板破坏深度为21.6 m,与11采区轨道大巷顶板距离较近;11采区轨道大巷顶板完整性较差,6 m以浅的区域是加固的重点;3步注浆法的浆液最大扩散距离可达10 m,巷道断面收敛率小,取得了较好的控制效果。

In order to ensure the stability of track roadway in No.11 mining area of Dongpang mine,the surrounding rock reinforcement technology of dynamic pressure roadway is studied by means of field investigation,theoretical analysis,borehole peeping and underground industrial test.The main research conclusions are as follows:mining,support density and construction mode of adjacent working face are the main factors causing large roadway deformation;the floor failure depth of 21111 working face is 21.6 m,which is close to the roof of track roadway in No.11 mining area;the roof integrity of track roadway in No.11 mining area is poor,and the area less than 6 m is the focus of reinforcement;the maximum diffusion distance of slurry by three-step grouting method can reach 10 m,the convergence rate of roadway section is small,and good control effect is achieved.