摘要
普阳煤矿位于一断陷盆地的浅部新近系地层中,矿区被3种类型的水文地质边界圈闭。煤层分布标高低于暗河出口100~230 m,煤田四周及盆地基底均为岩溶含水层,其承压水头高于煤层底板67~268 m,预计最低开采标高的平均承压水头约206 m。为解决矿区地下水突水威胁,监测普阳河水流入和流出的水量,根据水均衡原理及矿坑充水要素,制定中长期排水方案。研究结果表明,矿区岩溶发育垂向分带特征清楚,煤层底板以下岩溶含水层以弱岩溶带为主,单元内93%的地下水通过普阳暗河集中排泄,加之煤层以下有一定厚度的隔水层阻隔,故深层开采时可能发生局部突水危害,但水量不大,最大涌水量仅限于自然状态下补给普阳河的地下水径流量。结合矿坑充水控制因素及地下水动力学分析,采用水均衡法评价突水量,方便可行。
The Puyang coal mine,southeastern Yunnan lies in shallow Neogene strata of a fault-depression,encom⁃passed by three kinds of hydrogeologic boundaries.The elevation of coal seams is lower than the outlet of an under⁃ground river by 100-230 m.Surroundings and basin basement all host karst aquifers,of which the confined water head is higher than the coal-bed bottom by 67-268 m,and the average confined water head at the estimated lowest mining elevation is about 260 m.To solve the inrush threat of groundwater in the mine,it is required to monitor the amount of water inflow and outflow of the Puyang river,and establish a long-term drainage scheme.Investigations show that the karst in the mine area is of clear vertical zoning.The karst aquifer beneath the coal-bed bottom is dominated by weak karst zones.In the mine area,93%of underground water drainages through the underground Puyang river.Besides,confined beds of some thickness exist below the coal seam,thus local water inrush may occur when mining at depth.But the amount of such water inrush is not big,with the maximum only equivalent to the volume of underground water runoff to the Puyang river in the natural state.Combining the control factors of pit water filling and dynamic analysis of underground water,it is considered convenient and feasible to estimate amount of water inrush using the water balance method.
作者
段乔文
吴继明
冷吉诚
DUAN Qiaowen;WU Jiming;LENG Jicheng(Honghe Branch of Yunnan Institute of Survey and Design for Geological Engineering,Kaiyuan,Yunnan 661600,China)
出处
《中国岩溶》
CAS
CSCD
北大核心
2021年第2期189-197,共9页
Carsologica Sinica
关键词
岩溶
煤层底板
暗河出口
承压水头
涌水量
karst
coal-seam bottom
underground river outlet
confined water head
inrush amount
