积水区下导水裂隙发育特征实验研究

Experimental Study of Development Features of Conducting Water Fissures Below Water-logged Zone

针对陕北焦家沟煤矿积水区下裂隙发育特征研究表明:竖向裂隙与上部积水区的沟通存在3种情况:1开切眼处沿垮落角方向与5#煤层房柱式采空区沟通,裂隙导水性强,但远离工作面;2推过隔水煤柱前周期来压过程中有竖向裂隙与5#煤层房柱式采空区沟通,采空区积水量大,但裂隙导水性弱;3推过隔水煤柱后周期来压过程中有竖向裂隙与5#煤层长壁采空区沟通,裂隙导水性强,但采空区积水量小。

Aiming at the feature of fissure development below water-logged zone in Jiaojiagou coal mine, the results showed that there are three kinds of conditions of vertical crack through its upper water-logged zone. Firstly, the vertical fissure linked goaf of room and pillar mining along caving angle direction, the fissure far away from working face and its character of conducting water was strong;secondly, the vertical fissure linked goaf of room and pillar mining at the process of periodic weighting before the working face advanced waterproof coal block, even though goaf of 5#seam had accumulated large volume water, the fissure easily was closed and its character of conducting water was weak;thirdly, the vertical fissure linked goaf of room and pillar mining at the process of periodic weighting after the working face advanced waterproof coal block, the fissure was hardly closed and its character of conducting water was strong, but the goaf of 5#seam only accumulated small quantity of water.