阶段空场嗣后充填胶结充填体抗压强度研究

Research on compressive strength of cemented filling body in subsequent filling at the stage of open stope

为了研究阶段空场嗣后充填法中胶结充填体于临空侧保持稳定、不崩解所需要的抗压强度值。根据胶结充填体同围岩的相互作用,采用数学模型法,建立充填体受力微分方程,推导了考虑充填体受围岩压力与充填采场尺寸影响的抗压强度计算式,并同太沙基模型,托马斯模型计算结果进行比较。研究结果发现,充填体内部应力受围岩压力与采场尺寸影响明显,围岩应力条件复杂情况下,应当考虑充填体受有限的围岩压力作用,不考虑胶结充填体所受附加应力影响所确定抗压强度值偏小。

In order to study the compression strength value of the cemented filling body which kept its free face stability and integration in subsequent filling at open stope, the filling body stress differential equation was established through math model method, the compressive strength formula was deduced with consideration of the surrounding rock stress and the filling stope size, and the computed results were compared with the research of the Terzaghi and Thomas models. The results have shown that the cemented filling body＇s inner compressive strength is obviously effected by the surrounding rock stress and the filling stope size; the finite surrounding rock stress which worked on the filling body should be considered and the additional surrounding rock stress should not be ignored when the surrounding rock condition is complex.