Abstract: The selfstarting drainage method is a new type of intermittent wave drainage method. In this paper, a selfstarting drainage model for analytical study is established innovatively, and Diracδ function is introduced to describe the mathematical characteristics of the point sink of the selfstarting drainage model and to derive the twodimensional flow motion equation of the diving profile and the boundary conditions of the diving surface from this model. The twodimensional Fourier transform is used to solve the problem of the model, and the analytical solution of the seepage field after selfstarting drainage is obtained. Under the two setting conditions, the slope phreatic line curves obtained from the numerical simulation results and the theoretical solutions by the selfstarting negative pressure drainage method are calculated and compared. The results show that in the three groups of working conditions with different drain hole positions, the deeper the drain hole position, the greater the error of the theoretical solution, and the error between the theoretical solution and the numerical simulation results is the largest near the drain hole area when the drain hole position is (24,10); In the three groups of working conditions with fixed drainage hole position but different initial head heights, the higher the left and right heads, the greater the error of the theoretical solution, and the error between the theoretical solution and the numerical simulation results is the largest when the left head is 28 m and the right head is 8 m. The theoretical solution of saturation line of the analytical solution of the self starting negative pressure drainage seepage field is in good agreement with the numerical simulation results under simplified conditions.

Key words: landslide, selfstarting drainage method, phreatic water, phreatic line, analytical solution, numerical simulation