All-Refined Saturated-and-Unsaturated Simulation Analysis of Densely-Distributed Drainage Holes

For the seepage problems of densely distributed drainage holes, only steady saturated seepage analysis is not enough frequently. In this paper, the analytical method of saturated-and-unsaturated drainage sub-structure is adopted to solve the problem. Meanwhile, in order to bring comprehensive and refined simulation to the actual seepage status of drainage sub-structure, the theory and method of all-refined numerical simulation is presented for the first time. The classifying and processing methods for the boundary conditions of non-permeability, water head of nodes known, saturated escape surface, rainfall infiltration, unsaturated evaporation and infiltration, and other surfaces existing possibly in the substructure, are discussed in detail based on the different complete hydraulics model of the two different types of drainage holes proposed. Especially, the precise mathematical processing method for the internal water level of drainage hole of overflowing type of drainage sub-structure is presented. The case study shows that the all-refined numerical simulation method for densely distributed drainage holes is correct and applicable in solving the engineering seepage problems related.