Study on elastic P-wave propagation law in unfavorable geologic structures with discontinuous deformation analysis method

Application of the discontinuous deformation analysis method to stress wave propagation through a one-dimensional rock mass

“…25 Based on the viscous boundary, a force input method is used for inputting the incident wave. 23 The normal and tangential components of the velocity time history of the incident wave are transformed to the corresponding stress components:…”

“…[17][18][19] Additionally, to meet the demands of specific engineering problems, researchers can expediently modify the original DDA program with an open source code. [20][21][22] The authors [23][24][25] have developed the DDA method by modifying the boundary setting and stress wave inputting. These modifications enable DDA study the stress wave propagation across the rock mass.…”

“…Effects of geometric properties of the joints on wave propagation have been widely studied through theoretical analysis, 32 while lack of numerical simulation, especially in the DDA method. Considering the effects of joint space and joint number, Zhang et al 23 have analyzed the propagation laws of P-wave incidence across joints with the DDA method. However, mechanical properties of a joint are also important.…”

Boundary setting method for the seismic dynamic response analysis of engineering rock mass structures using the discontinuous deformation analysis method

“…Generally, the velocities of the block boundary movement are obtained using the explicit method, and the velocities in the previous time step are substituted into the current time step . However, a submatrix expression can be used in the DDA method to obtain accurate simulations.…”

Numerical and experimental investigation on the stability of slopes threatened by earthquakes

“…The theory and application in this area are still in the developing stages. Several methods to assess the stability of slopes during earthquakes have been developed, including pseudo-static analysis, stressdeformation analysis, the Newmark sliding-block model, finite element analysis, and distinct element analysis (Chakraborti et al 2012;Jiao et al 2004;Jiao et al 2012;Pirasteh et al 2013;Sarkar et al 2012;Tang 1997;Zhang et al 2013). However, there have been few advances in the safety analysis of landslide under seismic loading, and the limited available literature is concentrated mainly on the qualitative characterization, probability analysis, vibration monitoring for the deformation failure of landslides, and simple transplantation of the numerical tools (Del Gaudio and Wasowski 2011;Jiao et al 2005;Jiao et al 2007;Jibson 2011).…”