摘要
针对邻近层同采工作面回采巷道受多次采动影响变形量大的问题,采用理论分析、数值模拟和现场实测的方法对邻近层同采工作面在走向和倾向上的不同错距进行了研究。结果表明:1)邻近层工作面同采过程中,上下两工作面间岩层受多重采动影响经历了连续—似连续—非连续—散体的过程;2)走向错距不同时,邻近层工作面支承压力峰值、围岩破坏范围和破坏程度由大到小依次为错距20 m、错距0 m、错距50 m、错距60 m;3)受多重采动影响,下工作面运输巷位移随工作面的临近呈现台阶式增加,经历了2次逐渐增加—明显增加—稳定的过程。采区设计应考虑邻近层工作面同采产生的多重采动影响,设计并优化得出合理的走向错距和倾向错距,改善工作面回采时采场围岩尤其是回采巷道围岩的力学状态。
Aiming at the large deformation problems of roadway in nearby-layer simultaneous working faces, the paper has studied different staggered distances along strike and tendency in nearby-layer simultaneous working faces by means of theoretical analysis, numerical simulation and field measurement. The results have shown that：1） Owing to the impact of multiple mining during the progress of simultaneous mining, strata between the upper and lower working faces have experienced the continuous-quasi continuous-discontinuous-dispersion process. 2） Under the different strike staggered distances, the peak of abutment pressure, the scope and degree of failure rock have changed in descendingorder from staggered distance of 20 m, 0 m, 50 m to 60 m. 3） Affected by multiple mining, the displacement of haulage roadway in the lower face has shown stepped increase with the approach of working face, and twice experienced the process of gradually increasing-obviously increasing and being stable. Multiple mining effects which have been produced by simultaneous mining should be taken into consideration in the mining area design, and reasonable strike staggered distance and tendency staggered distance should be designed and optimized to improve the mechanics state of the stope rock, especially surrounding rock of roadway.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2016年第2期278-283,共6页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51304007)
安徽省自然科学基金项目(1408085MKL42)
深部煤矿采动响应与灾害防控安徽省重点实验室开放基金项目(KLMME12104)
关键词
邻近层工作面
同采
动压巷道
错距
nearby-layer working face
simultaneous mining
dynamic pressure roadway
staggered distance
