Due to the Ordovician limestone water pressure reached to 7.5 ～ 10. 4 MPa in first exploration zone of the low group seam in Dongtan Mine, a large scale hydrological additional exploration was conducted for the safety mining of the low group seam. A systematic analysis and study was conducted on the geological and hydrological conditions of the exploration zone. Based on the circumstances, a hydrological conception model of the exploration zone was established and thus the relevant mathematics model was obtained. The underground water quantity and water quality computer simulation software system FEFLOW with full functions was applied to simulate the Ordovician limestone water drainage and dewatering quantity in Ordovieian limestone hydrological I area, II area and Ⅲ area in the first exploration zone. The simulation results were individually as 1 900, 0,720 m3/h and the time required to drop to safety water table would be 10, 0 and 20 days. The simulation results showed that the pressure of the Ordovician limestone water could be dropped and the a safety mining of the low group seam could be realized.%基于东滩煤矿下组煤第一勘探区奥陶系灰岩水压高达7.5～10.4 MPa,为安全回采该下组煤进行了大规模的水文地质补充勘探,对勘查区地质及水文地质条件进行了系统地分析和研究,在此基础上,建立了勘查区水文地质概念模型,进而得到相应的数学模型,采用功能齐全的地下水水量及水质计算机模拟软件系统FEFLOW,模拟了第一勘探区奥灰水文地质Ⅰ区、Ⅱ区、Ⅲ区的奥灰疏降水量,结果分别为1 900、0、720 m3/h,降至安全水压的时间分别约为10、0、20 d.模拟结果显示,东滩煤矿奥灰水压可以疏降,可以实现下组煤的安全开采.
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