注水试验与放水试验求取渗透系数的差异

摘要

In order to compute mine inflow and water resource evaluation, the author has obtained the permeability coefficient of the Tai-yuan Formation limestone aquifer through water injection test instead of pumping test. Based on later period underground outflow test da-ta for the same aquifer, using the VISUAL MODFLOW established hydrogeological 3D unsteady flow numerical model, through partition fitting parameter adjustment obtained aquifer partitioned hydrogeological parameters. Through comparison of permeability coefficients from the two tests, the data from water injection test in fractured media are 35.6%~50.8%of the data from outflow test. It is advised that under the conditions unfit to carry out pumping (outflow) test, water injection test can be used; the obtained permeability coefficient should be multiplied by correction factors, then using it in mine inflow computation.%基于矿井涌水量计算及水资源评价需要，本文运用注水试验代替抽水试验，求取了太原组灰岩含水层的渗透系数。根据后期同一含水层井下放水试验资料，利用VISUAL MODFLOW建立了水文地质三维非稳定流数值模型，通过分区拟合调参，获得了含水层分区水文地质参数。通过对这两种试验求得的渗透系数进行比较，得出在裂隙介质中注水试验是放水试验所得渗透系数值的35.6%~50.8%。建议在不具备进行抽（放）水试验的条件下，可使用注水试验代替，所得渗透系数值乘以校正系数，用校正后的渗透系数来计算矿井涌水量。