Simulation of blast induced crater in jointed rock mass by discontinuous deformation analysis method

Abstract

Rock blasting is a dynamic process accompanied with the propagations of shock waves and the dispersion of the explosion gas. This paper adopts the discontinuous deformation analysis (DDA) method to simulate the rock blasting process. A dynamic parameter adjustment and the non-reflecting boundary condition are implemented in the DDA method. The sub-block DDA method to simulate fracture problems is used. The blasting process in jointed rock mass is simulated by application of the explosion gas pressure on the expanding borehole walls and induced connected fracture surfaces around the boreholes. The blast craters with different overburdens are derived. The whole process including the explosion gas dispersion, borehole expansion, rock mass failure and cast, and the formation of the final blasting piles in rock blasting are well reproduced numerically. Parametric study for different overburdens is carried out, and the results are analyzed and discussed.

Complex Modeling of the Effects of Blasting on the Stability of Surrounding Rocks and Embankment in Water‐Conveyance Tunnels

“…Ning et al analyzed the blasting vibration in jointed rocks by discontinuous deformation analysis (DDA). In DDA, the dynamic parameter adjustment and nonreflection boundary conditions were considered and the subblock DDA was applied in the software [16]. The characteristics of surrounding tunnel rocks under blasting vibrations have been investigated [17][18][19][20].…”

“…Time-history response curve of velocity at characteristic points on the embankment in the second excavation 16. Complexity are above the excavation tunnel and the representative points P4, P5, and P6 are on one side of the excavation tunnel.…”

Detection of contacts between three-dimensional polyhedral blocks for discontinuous deformation analysis

“…With continuous modifications and improvements, twodimensional (2-D) DDA has been more efficient and suitable to cover practical engineering problems of rockfall, 4-7 landslide, [8][9][10][11][12][13][14][15][16] tunneling and mining, [17][18][19][20][21] cavern and underground opening, [22][23][24][25][26][27] masonry structure, [28][29][30] fracture propagation, 31,32 rock blasting [33][34][35] and many others. [36][37][38][39][40][41][42] However, the applications of 2-D DDA are inappropriate to many practical problems because the majority of discontinuities are not always perpendicular to the cross-section of the model.…”