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根据对华北型煤田剖面、平面和水力内边界的水文地质特征的系统综合分析，本文首次提出了煤矿井立体充水地质结构的新理论。同时，依据内边界在空间展布的几何形态特征，将其划分为四种基本类型，即点状岩溶陷落柱型内边界，线状断裂（带）、裂隙型内边界，窄条状隐伏露头型内边界和面状裂隙网络（局部面状隔水层变薄区）型内边界。根据四种基本类型的不同组合形式，介绍了煤矿井不同的复合内边界类型和它们的矿井水文地质特征。文章最后指出，内边界是煤矿井立体充水地质结构理论的核心，搞清楚内边界是彻底解决华北型煤田日益严重的水害问题的关键。
According to the comprehensive analysis of the hydrogeological features of profile, hydraulic boundary and inner boundary of Huabei coalfield, this paper presents for the first time a new theory of geological filling structure of coal mine. At the same time, according to the spatial distribution of the inner boundary, the geometrical characteristics are divided into four basic types: the point-like karst collapse columnar inner boundary, the linear fracture (band), the fracture-type inner boundary, the narrow strip- Type inner boundary and facial fracture network (local thinned area of the surface of the hydrophobic zone) type of inner boundary. According to the different combinations of the four basic types, different types of compound inner boundaries and their hydrogeological features are introduced. Finally, the article points out that the inner boundary is the core of the three-dimensional geological structure theory of coal mine waterflooding. It is crucial to find out that the inner boundary is the solution to the increasingly serious water hazard problem in the North China type coalfield.