复采采场再生顶板结构及支架载荷确定

为确定复采采场支架的合理承载,通过理论计算、现场观测和顶板结构探测得到了复采再生顶板的结构分带特征,建立了再生顶板结构模型;基于该结构模型,结合现场观测和相似材料模拟实验,构建了下分层回采"支架–再生顶板"结构力学模型,应用该力学模型推导了支架载荷表达式,并进行了实例计算和现场验证。结果表明,再生顶板结构可分为"四带",即胶结再生带、弱胶结压实带、裂隙带和弯曲下沉带;再生顶板下回采下分层时,支架承载岩体可分为"两区",即完全承载区(A区)和部分承载区(B区);应用所推导的支架载荷表达式进行了实例计算,计算结果得到了现场支架载荷监测数据的验证。

Structure of regenerated roof and determination of support load in re-mining stope

To determine the reasonable support load in re-mining stope, the zoning characteristics of the structure of regenerated roof are obtained through theoretical calculation, field observation and roof structure detection, and a structural model for the regenerated roof is established. Based on this model, the structural mechanical model for the support and the regenerated roof is developed in combining with the field observation and similar material simulation experiments. The expression for support load is derived by using the mechanical model. The calculation of a field example and site verification are performed. The results indicate that the structure of the regenerated roof can be divided into four zones, namely, cemented regeneration zone, weak cemented compaction zone, fissure zone and bending zone. The rock mass born by the support can be classified into two regions, namely, fully bearing region (region A) and partly bearing region (region B). The monitoring data of field support load show good agreement with the calculated results of a practical example using the formulas derived from the mechanical model for the support and regenerated roof.