下向进路胶结充填顶板稳定性数值模拟

Numerical Simulation of Stope-roof in the Underhand Drift Cut-and-filling Stoping

针对大断面胶结充填体稳定性问题,应用数值模拟方法,对分级尾砂充填体变形规律进行了研究,得到了如下结论:充填体内布筋后可有效减小顶板拉应力区域,提高顶板的稳定性;灰砂比为1∶4的充填体可以作为承载层,其变形、应力分布规律与承载梁基本吻合,可替代钢筋混凝土人工假顶。

Aiming at the stability of large cross-section of filling body in cemented filling, numerical simulation was applied to study the law of transmutation in filling body. The arrangement of reinforcing steel bar in filling body can be effective in reducing the area of tensile stress and improve the stability of the stope roof. The lime- sand ratio of 1：4 precursors of the filling body can be used as bearing layer. And the deformation and the law of Stress distribution of filling body are in accordance with bearer beam. The filling body can replace the reinforced concrete artificial bottom.