四柱式与两柱式放顶煤支架适用条件分析

Suitable conditions for four-leg and two-leg sublevel caving shield supports

通过神东大柳塔煤矿应用的两柱式放顶煤支架和潞安屯留煤矿(余吾煤业公司)应用的四柱式放顶煤支架的矿压观测数据,分析了两种支架的理论支护效率和实际运行状态,提出了两种支架的适用条件,为今后各矿实施放顶煤开采选择合理的架型提供参考。

The suitable conditions were proposed on the basis of data from strata pressure behavior using two-leg shield supports in Liuta Coal Mine of Shenhua Group and four-leg shield supports in Tunliu Coal Mine of Lu＇an Group.The theoretical supporting efficiency and the practical operating status of two kinds of supports were analyzed and the suitable conditions for their application were proposed,providing a reference for different coal mines to choose proper supporting pattern when caving roof coal.