Using the Discontinuous Deformation Analysis to Model Wave Propagations in Jointed Rock Masses
Y.J. Ning; ; Z.Y. Zhao; J.P. Sun; W.F. Yuan

Source CMES: Computer Modeling in Engineering & Sciences, Vol. 89, No. 3, pp. 221-262, 2012
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Keywords Discontinuous deformation analysis, wave propagation, jointed rock mass, nonreflecting boundary, blast loading.
Abstract In this paper, wave propagations in jointed rock masses are modeled by the discontinuous deformation analysis (DDA) method. The selection of the numerical control parameters in the DDA for wave propagation modeling is discussed in detail, and the effects of the joint stiffness, the seismic loading frequency, the joint strength, and the incident angle on the propagations of stress waves in a jointed rock mass are modeled and analyzed. Two nonreflecting boundary conditions including the viscous boundary condition (VBC) and the superposition boundary condition (SBC) are coupled into the DDA. The applicability of the two nonreflecting boundary conditions for simple and complex wave propagation problems is verified. A blasting-induced wave propagation problem in a jointed rock mass is analyzed, in which the applicability of two blast loading application approaches, i.e., the displacement history input (DHI) and the stress history input (SHI), are studied, and the numerical derived wave propagation results are compared with the field test records. Results show that the DDA is a promising tool for the analysis of wave propagations in jointed rock masses.
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