深凹露天转地下采场地压及位移监测研究

Study on monitoring of ground pressure and displacement in underground mining area below a mined open-pit

杏山铁矿开采，处于露天转地下的过渡性阶段。为了解开采过程中采场地压及巷道变形规律，在-33m水平4、5回采进路中，布置8个钻孔应力计和4个收敛计对巷道围岩进行监测，并对监测结果进行分析，以确定采场围岩体中应力大小及巷道变形情况，更好地预测深部开采围岩地压活动规律，对矿山安全生产具有重要指导意义。

Mining operation in Xingshan iron is just in the transient stage from the open-pit mining to underground mining. In order to understand mining ground pressure and drift deformation in the mine , 8 borehole stress meters and 4 convergence gauges are arranged in No. 4 and No. 5 mining entrance o：[-33m level. According to the monitoring results, the mining ground pressure in surrounding rock mass and de- formation situation of drift are determined to improve prediction of ground pressure law in the mining area. This is of great significance for safety of the mining production.