充填采煤液压支架夯实离顶距影响因素研究

Study of factors influencing the gap between backfill hydraulic support and roof

利用Pro／E5．0三维仿真软件构建了3种常用型号固体充填采煤液压支架的实体模型，基于务实离顶距合理性的判定原理，重点分析了支护高度、煤层倾角、顶板提前下沉量及夯实作用次数等因素对夯实离顶距的影响规律．结果表明：各因素对夯实离顶距均有明显影响，其中支护高度最为显著；影响程度各有区别，不同型号支架适应的工程地质条件也各有不同，以六柱正四连杆支架为例：支护高度为最大设计高度60％～85％、煤层倾角近水平、顶板提前下沉量为0、循环夯实6次以上时，夯实离顶距最易保障充填采煤液压支架的充填性能，且该架型支架适应煤层倾角较小、对充实率要求不高、顶板条件较好的充填工作面．

Three types of backfill hydraulic support models are established using Pro/E 5. 0 simulation software. The supporting height, coal seam dip angle, pre-roof subsidence and tam- ping times on roof gap are analyzed based on the judgment principle of rationality roof gap. Re- sults show that all the factors, especially the supporting height, have a significant impact on the value of roof gap, however the degree of influence differs. Different types of backfill hy- draulic support are suitable for different engineering conditions. For six columns and four bar linkage backfill hydraulic support, a best compression ratio can be achieved when supporting height is 60%-85% of the maximum designed height, the coal seam is nearly horizontal, tam- ping times are no less than 6, and pre-roof subsidence is 0. This type of support is suitable for a backfilling coalface with small seam dip, low demanding of compression ratio and good roof conditions.