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地下水面之上井孔入渗时,在井孔附近形成了饱和区和非饱和区。在透水性能较小的多孔介质中,非饱和区的范围和影响很大。不考虑非饱和区对井孔入渗的影响,不考虑非饱和区对反求土体渗透系数的影响,将会给某些情况带来很大误差,特别是对于地下水埋藏很深的情况。本文将首先考察非饱和区对地下水埋藏很深井孔入渗的影响,应用一种饱和-非饱和区数值计算方法——有限差分积分法,进行井孔入渗计算,应用A.T.Corey的非饱和区渗透理论对计算成果进行分析,归纳总结出从野外试验资料反推土体饱和渗透系数的经验公式。其计算结果与数值计算结果有很好的一致性。
When the wellbore is infiltrated above the groundwater surface, saturated and unsaturated regions are formed near the wellbore. In porous media with low permeability, the range and effect of unsaturated zone are very large. Regardless of the effect of unsaturated zone on wellbore infiltration, the impact of non-saturated zone on the permeability coefficient of reversed soil will not be considered, which will cause great errors for certain situations, especially for the situation of deep groundwater burial. In this paper, we will first examine the effect of unsaturated zone on deep wellbore infiltration of groundwater. We use a finite difference integration method for numerical calculation of saturated-unsaturated zone to perform wellbore infiltration calculation and apply ATCorey’s unsaturated zone. Penetration theory analyzes the calculation results and summarizes the empirical formulas for pushing back the saturated permeability coefficient of the soil from the field test data. The calculation results are in good agreement with the numerical calculations.