For the complex topographical tailings dam

neither the complicated and changeable seepage field nor the action of three direction seepage factors at the same time can be fully reflected in the two-dimension model; as a result the real seepage field cannot be acquired. A three-dimension mathematical model is set up; and both section and terrain are simplified. An example is given; and the result is compared with that of the test .The better identical result indicated that the three-dimension model must be adopted in the seepage analysis of the complicated topographical tailings dam; and the appropriate predigestion can satisfy the precision and reduce the complicity and difficulty.