Chensilou Mine,Yongcheng Coal and Electric Power Holding Company Limited

为解决矿井深部沿空留巷的难题,针对陈四楼煤矿埋深800 m及以下的沿空留巷工作面地质条件和巷道变形破坏特征,通过理论分析,找出巷道变形破坏规律。提出了"超前点柱+高强度注浆+高强度、低密度锚索"的巷内主动联合支护技术,来保持原矩形巷道围岩的完整性和自身足够的承载能力;采用"高强度双液速凝充填墙+锚杆(索)对拉补强支护+密集点柱"的巷旁主、被动组合支护技术,提高巷旁充填墙体的稳定性和抗压强度。结果表明:在陈四楼煤矿深部21701工作面应用上述沿空留巷关键技术后,有效控制了巷道围岩变形,留巷60 d后围岩变形趋于稳定,顶板下沉量最大为126 mm,两帮位移最大为243 mm,底鼓量最大为532 mm,保证了巷道的安全正常使用。

in order to solve the dificult problem of gob- side entry retaining in the deep mine,according to the deep depth of 800 m in Chensilou Mine as well as the geolgical conditions of the coal mining face with gob-side entry retaining and the deformation failure featuresof the gateway.with the theoretical analysis,the deformation falure law of the gateway was found.An active combined support technology of the gateway withan advanced pilar + high strength grouting + high strength and low density anchor was provided to keep the surrounding rock integraity of the original rectangular gateway and the self suficient loading capacity.The active and passive combined support technology of the two sidewalswih" the high strength double grouts backilld wall + bol( anchor) cross supplement support +densepilars" was applied in order to improve the stabiliy and compressive strength of the backilled walls of the gateway sidewall he results showed that after the key technology of gob-side entryretaining applied to No.21701 coal mining face in the deep depth of Chensiou Mine,the surrounding roek deformation of the gateway was effectively controlled,the surounding rock deformation of gob-side entry retaining was in stable after 60 days,the max subsidence of the roof was 126mm,the max convergence between the two sidewalls was 243 mm and the max foor heave value was 532 mm.A normal operation of the gatewayduring the safety production process was ensured.