厚煤层综采工作面强矿压分布规律与支护技术研究

Study on Distribution Law of Strong Rock Pressure and Support Technology in Fully Mechanized Mining Coal Working Face of Thick Coal Seam

针对纳林河二号矿井31102工作面沿空巷道支护困难问题,采用理论分析、现场实测等方法,研究了该工作面强矿压分布规律,设计了强矿压条件沿空巷道支护方法.研究结果表明:①31102工作面进入双工作面见方阶段时,工作面覆岩为标准的载荷三带结构,即"ILZ+DLZ+SLZ"."ILZ"厚度为0~66.4 m,"DLZ"厚度为66.4~312.9 m,"SLZ"厚度为312.9 m~地表.②31102工作面超前支承压力峰值为47.91 MPa,距离工作面约123 m,最大影响距离约250 m.依据微震实测数据分析结果,结合该矿井实际支护效果,提出强矿压条件下,基于临空巷道微震走向分布特征的"四位一体"分区控制超前支护技术.

According to the difficult support problem of the gateway retained along the goaf in 31102 working face of Nalinhe No.2 Coal Mine,a theoretical analysis,site survey and other methods were applied to study the distribution law of strong rock pressure of the working face and to design the support method of the gateway retained along the goaf under the condition of the strong rock pressure.The results showed that:firstly,when 31102 working face was in a square stage of the double working faces,the overburden strata of the working face would be a standard loading three zone structure and that would be"ILZ+DLZ+SLZ".The"ILZ"thickness would be 0~66.4 m,"DLZ"thickness would be 66.4~312.9 mand"SLZ"thickness would be 312.9 m^the ground surface;secondly,the advanced support pressure peak of 31102 working face was 47.91 MPa,the distance of the pressure peak to the coal mining face was about 123 m and the max influence distance was about 250 m.According to the analysis results of the site measured microseismic data,based on the microseismic strike features of the goaf-side gateway,the advanced support technology of"four in one"divisional control was provided under the condition of the strong rock pressure.