The First Exploration Team of Shandong Province Coalfield Geological Bureau
Geophysical Exploration Survey Team of Shandong Province Coalfield Geo-logical Bureau

三维地震显示鲁西南某煤矿存在4个疑似陷落柱的异常区,通过地面钻探验证了1#、2#异常区为岩溶陷落柱,基本查明岩溶陷落柱的空间形态及发育高度,岩溶陷落柱富水性差,陷落柱内破碎混杂的岩块已重新固结成岩。岩溶陷落柱总体为不透水岩层,不排除采动后构造活化,奥灰水沿陷落柱导入井下。为确保安全开采,采掘过程中应留设陷落柱保护煤柱,采用不同方法计算了3上采煤工作面与陷落柱间的安全保护煤柱,提出了陷落柱影响区采掘活动的防治水措施,确保矿井安全生产。

The 3D seismic shows that there existing four abnormal areas of suspected collapse columns in a coal mine in southwestern Shandong. Through ground drilling, the 1 and 2 abnormal areas are verified to be karst collapse columns, and the spatial morphology and development height of karst collapse columns are basically found out. The water richness of karst collapse columns is poor, and the fragmented and mixed rock blocks inside the collapse columns are re consolidated into rocks. The karst collapse columns is generally an impermeable rock stratum, and it is not ruled out that after mining, the structure will be activated, and the Ordovician limestone water will be in-troduced into the downhole along the collapse columns. To ensure safe mining, collapse columns should be left to protect the coal pillars during the mining and ecavation process. Different methods are used to calculate the safety protection coal pillars between the 3 coal mining working face and the collapse columns. Water prevention and control measures are proposed for the mining and excavation activities in the area affected by the collapse columns to ensure safe production in the mine.