宜丰新庄铜铅锌矿地下水综合防治技术

Comprehensive Prevention and Control Technology for Groundwater in Xinzhuang Copper,Lead-zinc Mine from Yifeng

宜丰新庄铅锌矿主要富水地层为矿体的间接顶板石炭系黄龙-船山组灰岩(CR2Rh-CR2Rc)(外灰岩),单位涌水量q=1.74~1.85 L/(s·m),渗透系数K=0.906~2.397 m/d,为水文地质条件复杂类型的岩溶大水矿山。矿山在开发初期曾发生巷道突水,导致巷道被淹,地面出现开裂、塌陷等现象,可见地下水的突水问题是该矿开采不可忽视的重大安全隐患。为实现安全采矿,矿山一方面采取留设保安矿柱、主岩枝补强、上向水平分层充填法采矿保护主岩枝,另一方面采取地表23线注浆帷幕、补封老钻孔、井下丛状放水孔疏干等地下水综合防治措施。实践证明,这些防治水措施使得矿坑-225 m中段以上地下水涌水量减小约94%,对同类矿山的地下水防治具有借鉴意义。

The indirect roof of the deposit with the main water rich strata in Yifeng Xinzhuang lead zinc mine,belongs to Carboniferous Huanglong-Chuanshan limestone（CR2 Rh-CR2 Rc）（external limestone）. With features of the unit water gushing amount q=1.74 to 1.85 L/（s·m）,and the permeability coefficient K=0.906 to 2.397 m/d,it is a water-rich karst mine with complex hydrogeological conditions. In the early stage of development in the mine,the water inrush in the roadway resulted in the flooding of laneway,and the cracks and collapse of ground. It can be seen that the ground water inrush is a major hidden danger that can not be ignored in the mining. In order to realize safety mining,such measures are proposed as remaining safety pillar,reinforcing main apophysis,and adopting the upward horizontal stratified filling to protect main apophysis on the one hand. On the other hand,the comprehensive prevention measures are adopted such as grouting curtain at line 23,sealing old boreholes,and dewatering at underground tufted water hole. The practice has proved that these water treatment measures make the water inflow at level-225 m or above in the pit lowered by about 94%,which is of reference significance for the prevention and control of the groundwater in the similar mine.