利用单孔稳定流混合抽水试验求取分层渗透系数的方法研究

Research on the Method of Calculating the Layered Permeability Coefficients by Using Single-hole Stable Flow Mixed Pumping Test

为了解决具有多个充水含水层的矿区中水文地质孔施工和分层抽水试验难度大的问题,以裘布依稳定流渗流理论为依据,建立了利用钻孔单孔混合抽水试验求取分层渗透系数的“概念模型”和“数学模型”,并以两个有代表性的勘查矿区为实验场,通过实验场中水文地质钻孔的施工、抽水试验、数据采集和资料综合分析,开展了单孔混合抽水试验求取含水层分层渗透系数的方法研究。实验结果证明,两个实验场水文地质孔混合抽水试验解算出的含水层渗透系数与单层实际抽水试验计算的结果的相对误差仅分别为3.73%和4.4%,反映出研究提出的方法可行,可为相同类型矿床水文地质结构矿区勘查提供借鉴。

In order to solve the problem of difficult hydrogeological hole construction and layered pumping test in mining areas with multiple water-filled aquifers,two representative exploration and mining areas were selected as experimental sites,and based on the seepage theory of Qiubuyi stable flow,a method of calculating the layered permeability coefficient by using borehole single-hole mixed pumping test was establishedConceptual Models and Mathematical Models.Based on the construction,pumping test,data collection and comprehensive analysis of the hydrogeological borehole in the experimental field,the method of obtaining the permeability coefficient of aquifer stratification from the single-hole mixed pumping test was studied.The experimental results show that the relative errors of the permeability coefficients of the aquifer calculated by the mixed pumping test of the hydrogeological holes of the two experimental sites and the results calculated by the actual pumping test of the single layer are only 3.73%and 4.4%,respectively,which reflects the feasibility of the method proposed in this study and can provide a reference for the exploration of mining areas with hydrogeological structures of the same type of deposits.