【摘要】 龙固煤矿主采煤层上覆基岩厚度平均不足200 m,但基岩上方赋存着厚度平均超过700 m的厚冲积层,针对厚冲积层条件下工作面矿山压力与顶板的控制难题,分析了大采高长壁综放工作面上覆厚冲积层在采动卸荷条件下的承载特性,以及基岩发生台阶下沉的可能性及其对应临界厚度。研究结果表明,厚冲积层在其底部煤层大范围开挖后,自承载能力不强,其自重将以载荷形式作用在下伏基岩上,但当基岩厚度大于120 m时,断裂带岩层可以形成稳定的力学承载结构,确定工作面顶板具有可控性。在此基础上,研发了工作阻力为国内最大的ZF15000/23/43综放支架,对厚冲积层下大采高综放面围岩进行了有效控制。更多还原

【Abstract】 The average thickness of the overlying bedrock of Longgu primary mineable coalseam is less than 200 m,but there is a thick alluvium averaging above 700 m above the bedrock.The bearing characteristic of fully mechanized longwallcaving face with large mining height on the condition of unloading,the possibility of step sinking and its critical thickness are analyzed in order to solvethe problems of the mine pressure atmining face and strata control underthick alluvium condition.The results show that,whileits bearing capacity is not strong after large excavation underthe bottom of deep alluvium and itsweight is loaded onthe underlying bedrock,the fracture zone can form a stable mechanical bearing structurewhen the thickness of the bedrock is more than 120 m,so the coalface roof canbe controlled.On this basis,ZF15000/23/43 hydraulic support has been developed,with the largest working resistance in China.With this hydraulic support,the surrounding rock in fully mechanized caving coalface with large mining height underthick alluvium can becontrolled.更多还原