经千秋煤矿21 采区下山煤柱区现场应用，效果良好。
The research achievements were applied to the dip coal pillar area of No. 21 mining district, Qianqiu coal mine successfully.
芦沟矿21采区下山通过采用U型钢-锚网支护，改善了巷道支护状况，取得了明显的技术经济效益。
Through adpting U-steel bolting with wire mesh in 21 dip of Lugou coal mine, condition of roadway supporting is improved, technological and economic results are gained.
如何安全回收采区上下山孤岛煤柱，提高矿井资源采出量，是矿井生产中遇到的难题之一。
It is one of challenges in the mining production to recover these coal pillars in order to increase the yield.
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