云南金沙磷矿地下开采对地表公路安全性的影响分析

Influence on the Surface Road Safety of a Phosphate Underground Mining in Yunnan

为了研究矿山采场开采后围岩稳定性及对上覆公路的影响,采用离散元软件2D-block,模拟5种工况,对模拟结果的应力、位移、速度云图进行了分析;结果表明:采场开采至920m、935m水平时,顶底板应力、位移、速度变化很小,不影响矿区公路安全;当开采至950m水平时,顶底板应力、位移、速度有了明显变化,但对公路仍不构成大的威胁,安全起见,此时应适当减小采场结构参数;开采至近地表时,地表垮塌,影响到公路安全。因此,建议开采范围控制在950m水平以下,并采取监测等手段以切实维护采场及上覆公路的安全。

In order to study the rock stability and impact on Mine Area Road after stope mining,by means of discrete element software 2D-block,5 kinds of simulation conditions were done. The simulation results of the stress, displacement, velocity contours were analyzed, The results showed that mining field to 920m, 935m level,the changes of the stress, the displacement and the speed of the top floor were very small,the road was safe;When the 950m level was mined,the stress, displacement and speed of the top floor were obviously changed, but the road was still safe,at this point, the stope structure parameters should be reduced;When mining to near surface,the surface collapse,which affect the safety of road;Mining should be below the level of 950m and take appropriate security measures.