错层位内错式采场“三带”高度的确定方法

Determination of height of “Three Zone” in the stope with stagger position and internal misaligned roadway layout

基于错层位内错式巷道布置采场"三带"的合理划分对工作面安全、经济的重要性,提出了以关键层理论为基础,综合考虑包括工作面回采范围、岩层断裂角等影响因素在内的新方法。通过实验研究了沿工作面推进方向上、下关键层之间以及关键层与工作面之间的几何关系;垮落带、裂隙带高度的运动特点以及错层位内错式巷道布置沿工作面方向上覆岩层的运动特点,并结合关键层的悬露尺寸与采场之间的空间关系,建立了相应的空间几何模型。结果表明,采场范围、岩层断裂角、岩层的物理力学性质、厚度均是采场"三带"划分的影响因素;另外,划分错层位内错式巷道布置"三带"时,在考虑采场范围因素时需要按照形成搭接工作面的总体个数确定。

Based on the importance of reasonable division of the＂Three-Zone＂to the security and economic of working face in stagger arrangement roadway layout conditions,we proposed a new division method which considered influencing factors such as working face area and fracture angle based on the key stratum theory.The geometric relationships between upper and low key strata,or between key stratum and working face are studied in the experiment;the movement characteristics of heights of caving zone and fracture zone,and the movement characteristics of overburden along the working face direction in stagger arrangement roadway layout conditions determined.The geometric model is established combining with the spatial relationship between the hanging size of key stratum and working area.The results show that working face area,fracture angle,mechanic properties and thickness of rock etc.are the influencing factors of division of the＂Three-Zone＂.In addition,the influence factor of working area should be considered with the total number of working faces in division of the ＂Three-Zone＂in stagger arrangement roadway layout conditions.