基于GMS的隐伏火烧区下煤层开采工作面涌水量预测

Prediction of water inflow volume in the coal mining workforce below the concealed fire area based on GMS

烧变岩在我国北方煤矿区大面积分布,由其引起的水害等问题严重威胁着煤矿的安全生产。目前矿井涌水量预测主要针对的是某一生产阶段或时间节点,预测值属于瞬时量,缺乏对矿井涌水量动态特征的预测。以神府矿区柠条塔井田南翼的1煤隐伏火烧区为例,利用GMS(Groundwater Modeling System)软件平台构建研究区地下水流数值仿真模型。基于地下水流场和抽水试验对模型进行识别,并采用抽水试验数据进行验证,其模拟结果较好地反映了研究区的实际水文地质情况。对1煤隐伏火烧区下伏的2煤回采工作面涌水量和地下水流场变化特征进行了预测,结果表明:在回采过程中,工作面涌水量逐渐增加,但受地下水袭夺作用,其临近的工作面涌水量逐渐减小;煤层开采时风化岩含水层分别形成了以切眼和工作面为中心的降落漏斗;随着工作面回采的不断推进,地下水位不断下降,漏斗范围不断扩大,导致地下水流场由双中心漏斗逐渐变为以工作面为中心的漏斗,进一步验证了地下水的袭夺作用。对单工作面及多工作面回采条件下涌水量和地下水流场变化特征进行了预测分析,为煤矿采动水害防治提供依据。

The variation characteristics of the volume of water inflow in the coal seam working face have an important effect on coal mine production safety.A numerical simulation model of the groundwater flow field was established using the Groundwater Modeling System(GMS)in the 1upper coal concealed fire area in the southern part of the Ningtiaota minefield in the Shenfu mining area.The initial conditions,hydrogeological parameters,and boundary conditions of the hydrological model simulation area were redetermined based on the aforementioned numerical simulation model.The model was checked using the groundwater flow field and pumping test and verified by pumping test data.The results show that the simulated results provide a good reflection of the actual hydrogeological conditions of the study area.Two groups of mining schemes were designed to predict the variation characteristics of the volume of water inflow and groundwater flow field in the 2coal mining working face below the concealed fire area.The results indicate that the water inflow volume in the mining working face increases gradually during coal mining but gradually decreases in the adjacent working face due to the capture of groundwater.According to the groundwater flow field prediction results,the funnels were centered on cut holes and the working face and shaped by weathered rock aquifers during mining.As the mining process continues,the groundwater level decreases,and the funnel range expands.These phenomena lead to gradual changes in the groundwater flow field from a double-centered funnel into an oval funnel that is centered on the working face which further confirms that the capture of groundwater occurs.The model enables the prediction and analysis of the various characteristics of the volume of water inflow and groundwater flow field during coal mining in single and multiple working faces.The results provide a valuable reference for water damage prevention in coal mining.