【作者】 刘瑜； 刘启蒙； 薛森； 李文平； 刘凯旋；

【Author】 LIU Yu;LIU Qimeng;XUE Sen;LI Wenping;LIU Kaixuan;State Key Laboratory of Mining induced Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University Of Science And Technology;School of Resources and Geosciences,China University of Mining and Technology;School of Earth and Environment,Anhui University Of Science And Technology;School of Earth Science and Engineering,Nanjing University;

【机构】 安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室； 中国矿业大学资源与地球科学学院； 安徽理工大学地球与环境学院； 南京大学地球科学与工程学院；

【摘要】 "砂-基"型矿区内第四系潜水含水层直覆于基岩之上,缺失关键隔水土层,潜埋煤层开采容易导致潜水的严重漏失。以鄂尔多斯转龙湾典型矿区为例,运用Modflow建立三维水文地质模型,基于地下水位实测动态数据进行了模型识别验证与参数敏感性分析。结果显示:流场与水位变化与实际相符,降雨对于水文动态影响显著。分析了采后残余保护层厚度,预测了采后5年潜水水位分布。结果显示:高海拔基岩地区与河谷段水位变化较小;231采区山前冲积扇区域水位下降明显,最大超过40m且近潜水含水层底板;地下水位的长期剧烈下降对于河流流动和对下游地下水补给有显著影响。研究成果对西部"砂-基"型矿区保水采煤与生态地质环境保护具有重要意义。更多还原

【Abstract】 The Quaternary phreatic aquifer in the "sand-bedrock" type mining area is directly overlying the bedrock.Lacking the key impervious soillayer,the mining of buried coal seam is liable to cause serious leakage of phreatic water.Taking the typical mining area of Zhuanlongwan in Ordos as the example,a three-dimensional hydrogeological model was established by using Modflow software.The model identification and sensitivity analysis were carried out based on the measured dynamic data of groundwater level.The results show that the variations of flow field and water level are consistent with the actual situation,and rainfall has significant influence on hydrological dynamics.The thickness of residual protective layer after harvest was analyzed,and the distribution of groundwater level in the 5 years after mining was predicted also.The results show that the water level changing is small both in the bedrock area at high altitude and the river valley section.While the water level in piedmont alluvial fan area of 231 mining area has dropped obviously,the maximum is more than 40 meters and near the floor of phreatic aquifer.The long-term drastic drop of groundwater level has a significant impact on the flowing of river and the groundwater supplying in downstream.The research results are of great significance to water-preserved mining and eco-geological environment protection in the "sand-bedrock" mining area in Western China.更多还原