铁矿立井井筒地面预注浆设计及优化

大贾庄铁矿1号副井井筒地面预注浆工程取得了理想的治水效果，通过对其设计的分析及优化，在保证一定的注浆量和注浆次数的前提下，适当减少钻孔个数至10个或8个。注浆材料主要选择成本低、无污染、堵水率高且耐久性好的单液水泥浆和黏土水泥浆。注浆压力参照《GB50511-2010 煤矿井巷工程施工规范》中的规定，施工过程中终压尽可能地取压力范围的上限。在计算浆液注入量时应根据地质条件和拟注浆液类型将整个注浆段分为若干层段，分别选取最适合参数单独计算，浆液有效扩散距离不应小于10 m。注浆段高的划分需要充分考虑含水层、隔水层和破碎带的位置，并需在施工中根据各钻孔实际揭露的地层情况对注浆段高进行调整。

The Design and Optimization of the Surface Pre-Grouting for Shafts in Iron Mine

The ideal result of water prevention was obtained in surface pre-grouting for 1# auxiliary shafts of Dajiazhuang Iron Mine.From analysis and optimization of the design，the number of the grouting holes can be reduced to 10 or 8，with grouting quantity and grouting times assured.The main grouting material was single-liquid cement slurry and clay-cement slurry，Which was low cost，no pollution，high water shutoff rate and good durability.Grouting pressure should refer to Code for Acceptance of Shaft Sinking and Drifting of Coal Mine（GB50511-2010），and the upper limit should be taken over the pressure range in the process of construction.The grouting section was divided into several intervals according to geological conditions and the type of grouting material to be grouted，and the grouting quantity was calculated in each interval using the most suitable parameters.The effective dispersal distance should not less than 10 m.The depth of aquifer，aquifuge and fracture zone should be considered in the division of grouting intervals.And it needs be adjusted according to geological conditions exposed by grouting holes.