摘要
宁东侏罗系煤田下组煤开采受到宝塔山砂岩水害的威胁。为准确评估和预测矿山水害风险,本研究通过放水试验结合MODFLOW数值模拟,系统开展了含水层水文地质参数识别与涌水量预测研究。首先,基于水文地质条件的分析,建立了地下水流二维数值模型。通过多次模型调参与验证,成功反演了宝塔山砂岩含水层地下水初始流场特征。在此基础上,进一步构建了非稳定流数值模型,通过对地下水流场动态变化和观测孔水位数据的拟合分析,准确获取了含水层关键水文地质参数。为有效控制水害风险,创新性地采用长距离定向钻探技术对宝塔山砂岩含水层实施疏放降压工程。结果表明:基于数值模拟反演的水文地质参数能够准确的地表征含水层特征,为涌水量预测提供科学依据。长距离定向钻孔疏水降压技术显著降低了含水层水位,可为类似条件下的煤田水害防治提供参考。
The mining of lower coal seam in Ningdong Jurassic coalfield is threatened by water hazards associated with Baotashan sandstone.In order to accurately evaluate and predict the risk of water hazards in the mine,this study systematically carries out the identification of hydrogeological parameters of aquifels and the prediction of water inflow through drainage tests combined with MODFLOW numerical simulation.Based on the analysis of hydrogeological conditions,a two-dimensional numerical model of groundwater flow is established.The initial flow field characteristics of groundwater in Baota Mountain are successfully inverted through multiple model calibrations and validations.On this basis,a numerical model of unsteady groundwater flow is further constructed.Through the fitting analysis of the dynamic change of groundwater flow field and the water level data of the observation hole,the key hydrogeological parameters of the aquifer are accurately obtained.In order to effectively control the risk of water hazards,the long-distance directional drilling technology is innovatively used to carry out the drainage and depressurization project in Baotashan sandstone aquifer.The results show that the hydrogeological parameters based on numerical simulation and parameter inversion can accurately reflect the characteristics of aquifers and provide a scientific basis for the prediction of water influx.The dewatering and depressurization technology of long-distance directional drilling significantly reduces the aquifer water level,which provides valuable reference for the prevention and control of water disaster under similar conditions in coalfileds.
作者
马鑫
赵子敬
高峻
王建泽
赵宝峰
Ma Xin;Zhao Zijing;Gao Jun;Wang Jianze;Zhao Baofeng(Lingxin Coal Mine of China Energy Ningxia Coal Industry Co.,Ltd.;CCTEG Xi an Research Institute)
出处
《勘察科学技术》
2025年第4期40-47,共8页
Site Investigation Science and Technology
基金
国家自然科学基金(41807221)
陕西省自然科学基础研究计划(2023-JC-ZD-27)。
关键词
宝塔山砂岩
含水层参数
参数反演
长距离定向钻探
疏水降压
Baotashan sandstone
aquifer parameters
parameter inversion
long-distance directional drilling
drainage and depressurization
