山东济宁三号煤矿上组煤水文地质条件分析

Upper Coal Group Hydrogeological Condition Analysis in Jining No.3 Coalmine, Shandong

济宁三号煤矿目前开采的煤层为上组煤的3煤(3上、3下煤),自投产以来,发生多次涌水,如13下01综放面侏罗系底部含水层最大涌水量达533.84m3/h,63下01综放3煤顶板砂岩最大涌水量527m3/h,曾一度出现工作面局部被淹而导致停产,对矿井的安全高效生产构成了极大的威胁。在综合分析研究上组煤顶板各含水层的水文地质特征和充水条件的基础上,认为上组煤(3上、3下煤)开采时的直接充水水源为3煤顶板砂岩含水层;间接充水水源是侏罗系含水层水以及局部地区对侏罗系含水层起补给作用的第四系含水层;部分地区侏罗系含水层被采动裂隙导通而成为直接充水水源,大部分地段第四系底部均为粘土,有效的阻隔了第四系与下伏侏罗系含水层的水力联系,对下伏含水层补给微弱;充水通道主要有断层、采动裂隙、封闭不良钻孔和破坏的井筒。为指导下一步煤矿生产预防水害事故提供了依据。

The target mining coal seam is coal No.3 （3U and 3L） in upper coal group in the Jining No.3 coalmine at present. Since the production, water gushing happened many times. Such as 13L01 fully mechanized caving face Jurassic bottom aquifer maximum water inflow 533.84m^3/h, 63L01 fully mechanized caving face coal No.3 roof sandstone maximum water inflow 527m^3/h have lead to a halt of production once because of working face flooding locally, thus seriously threatened eoalmine safe and efficient production. Based on analytic investigation of upper coal group aquifer hydrogeological characteristics and water filling condition, considered that the direct water filling source is coal No.3 roof sandstone aquifer during the winning of upper coal group coal No.3 （3U and 3L）; while the indirect water filling sources have Jurassic aquifers water and Quaternary aquifers water locally recharged into Jurassic aquifers. Parts of Jurassic aquifers because of mining-induced fissure conducting become direct water filling source. Most parts of Quaternary bottom is clay, effectively blocks hydraulic connection with underlying Jurassic aquifers, thus the recharge into underlying aquifers is very weak. Water filling channels have faults, mining-induced fissures, poorly sealed boreholes and destructive shafts. The study has provided basis for water hazard prevention in coalmine production.