The responses of one-dimensional stress wave with different boundaries were verified using DDA method. On this basis, both the displacement and stress way to input seismic wave were achieved and compared. Based on the one-dimensional DDA model, the block element size and joint stiffness in wave calculation were studied.The results showed that the DDA model grid in the direction of wave propagation should take 1/15~1/20 of the shortest wavelength.The lower the joint stiffness is, the more observable the attenuation of elastic P-wave is.When the joint standard strength is greater than 0.5,the difference between DDA calculation and theoretical solution of transmission coefficient of joint surface is less than 5%.Based on the preliminary research results of wave problem in DDA method, the dynamic response of an underground house under sine wave was analyzed simply.The DDA result is consistent with the finite element solution, and it lays the foundation for dynamic response analysis of engineering case using DDA method.
