应力异常区软弱顶板巷道全锚索支护技术

分析了煤矿锚索在使用中存在的问题,基于高预应力强力支护理论,在应力异常区、顶板软弱、矿压显现剧烈的巷道全断面采用高预应力短锚索支护技术。通过数值模拟对比,得出全锚索支护的预应力大小及作用效果均远优于普通锚杆、锚索支护,并能改善掘进面超前围岩受力状态。在潞新二矿W4203运输巷进行了全锚索支护试验,巷道顶板下沉量与原支护相比减小90%以上,变形得到控制,有效解决了巷道掘进过程中炸帮及大变形等技术问题,锚索间排距增大到1 200mm伊1 400 mm,大幅提高了巷道掘进效率。

Full Anchor Support Technology of Mine Roadway with Soft Roof in Stress Abnormal Zone

In order to analyze the problems existed in the application of the mine anchor,based on a high pre-stressed power support theory,a high pre-stressed short anchor support technology was applied to the full cross section of the mine roadway with soft roof and serious mine pressure behaviors in abnormal zone.In comparison with the numerical simulation,the pre-stress and function effect of the anchor support obtained was better than the conventional bolt and the anchor support and the stressed status of the pilot surrounding rock in the mine roadway heading face could be improved.A full anchor support trial was conducted in No.W4203 Mine Transportation Roadway of Luxin No.2 Mine.The roof subsidence value of the mine roadway was reduced over 90% than the previous support in comparison.The deformation of the mine roadway was controlled.The sidewall over blasted,deformation and other technical problems were effectively solved in the mine roadway heading process.The space and row spacing between the anchors were increased to 1 200 mm×1 400 mm and the heading efficient rate of the mine roadway was highly improved.