充填开采充实率控制原理及技术研究

为评估固体充填开采采空区充填效果,提出以充实率作为技术衡量指标,并分析了影响充实率的关键因素。研究表明,顶板的提前下沉量、欠接顶量和充填物料的压缩变形量是决定充实率的三大关键因素,并据此优化了充填设备的结构及性能参数、改进了充填工艺、建立了充实率监控体系。该成果成功应用于平煤十二矿充填采煤工作面,采空区的实际充实率达到89.4%,实测地表最大下沉量仅15 mm,保证了地表建筑物的安全使用。

Control Principle and Technology of Final Compression Ratio of Backfilling Materials

In this paper,to evaluate the goaf backfilling effectiveness with solid wastes,the final com-pression ratio of backfilling materials was proposed as the technical measurement index,and the associ-ated key affected factors were also analyzed.The results show that the three key affected factors of compression ratio include the roof subsidence before backfilling,the gap between the backfilling body and roof,and the compression amount of filling materials.Hereby,to improve the final compression ra-tio of backfilling materials obviously,the structures and the parameters of filling equipment were opti-mized,the filling technology was upgraded,and the supervisory control system of compression ratio was also established.The above achievements have been successfully applied in No.12 mine of Ping-dingshan coal group.The application results show that the actual final compression ratio of backfilling materials in the goaf is up to 89.4% and the maximum surface subsidence is merely 15 mm,thus ensur-ing the safety of surface buildings.