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针对矿井突水灾害预警需求,开展了稳态电场中一次场电位U对地下水渗流动态响应特征的研究工作,包括3种室内物理模拟实验和1项矿井现场试验,其中现场包括突水过程中的一次场电位U的测试和突水水量Qo的测试。均匀介质稳态渗流模拟实验和非均匀介质稳态渗流模拟实验都表明:固水二相介质饱水前,一次场电位U的变化包含2个阶段,在前一阶段,U与Qi具有二次相关关系,在后一阶段,U趋于稳定,不再随Qi的增加而变化。采动条件下的渗流模拟实验表明,采动条件下的渗流场演变可看成多段稳态渗流过程的接续,而每个独立的稳态渗流阶段内,U与Qi之间的关系都符合稳态渗流规律。现场试验表明在顶板突水过程中,探测区域出水量Qo与一次场电位U呈负的相关关系。
According to the need of early warning of mine water inrush disaster, the research on the dynamic response characteristics of primary field potential U to groundwater seepage in steady state electric field is carried out, including three kinds of indoor physical simulation experiments and one mine field test, including on-site water inrush process A test field potential U and water inrush Qo test. Both steady-state simulation of uniform medium flow and steady flow simulation of inhomogeneous medium show that the change of primary field potential U consists of two phases before the water saturated with two-phase medium is saturated. In the previous phase, U and Qi have the second-order In the latter stage, U tends to be stable and no longer changes with the increase of Qi. The seepage simulation experiment under mining condition shows that the evolution of seepage field under mining condition can be regarded as the continuation of multi-stage steady-state seepage process, and the relationship between U and Qi is consistent in each independent steady-state seepage stage State percolation law. Field tests show that in the process of roof water inrush, the water quantity Qo in the detection area is negatively correlated with the primary field potential U.