The seismic failure of jointed rock slopes is essentially a problem of dynamic fracturing and instability of discontinuous rock masses.In this study,seismic failures of anti-dip jointed rock slopes are numerically inv...The seismic failure of jointed rock slopes is essentially a problem of dynamic fracturing and instability of discontinuous rock masses.In this study,seismic failures of anti-dip jointed rock slopes are numerically investigated by the sub-block splitting discontinuous deformation analysis(DDA)method.Firstly,diametrically compressive rock discs with a central pre-existing crack of different inclinations are simulated to verify the effectiveness of the sub-block splitting DDA method for rock fracturing simulations.Thereafter,the fracturing failure and instability process of five anti-dip jointed rock slopes with different configurations under the Wenchuan earthquake waves of different amplitudes are simulated.Results indicate that with larger excavation area of the slope and larger amplitude of the seismic loads,and under specific horizontal relative direction of the seismic wave to the slope(SSHRD),the slope stability will be dramatically reduced,and the failure mode will also be changed upon a basic mode of toppling.The surface and elevation amplification effects of the slope under seismic loads are successfully reproduced as well by the simulations.This work reveals the seismic failure process and mechanism of anti-dip jointed rock slopes,and could provide theoretical reference to the disaster prediction of anti-dip jointed rock slopes under earthquakes.展开更多
Rock blasting is a dynamic process accom panied 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 bla...Rock blasting is a dynamic process accom panied 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.展开更多
基金funded by Sichuan Institute of Geological Survey,China,grant number SCIGS-CZDXM-2025006the Natural Science Foundation of Sichuan Province(Sichuan Province Science and Technology Support Program),China,grant number 2024NSFSC1953.
文摘The seismic failure of jointed rock slopes is essentially a problem of dynamic fracturing and instability of discontinuous rock masses.In this study,seismic failures of anti-dip jointed rock slopes are numerically investigated by the sub-block splitting discontinuous deformation analysis(DDA)method.Firstly,diametrically compressive rock discs with a central pre-existing crack of different inclinations are simulated to verify the effectiveness of the sub-block splitting DDA method for rock fracturing simulations.Thereafter,the fracturing failure and instability process of five anti-dip jointed rock slopes with different configurations under the Wenchuan earthquake waves of different amplitudes are simulated.Results indicate that with larger excavation area of the slope and larger amplitude of the seismic loads,and under specific horizontal relative direction of the seismic wave to the slope(SSHRD),the slope stability will be dramatically reduced,and the failure mode will also be changed upon a basic mode of toppling.The surface and elevation amplification effects of the slope under seismic loads are successfully reproduced as well by the simulations.This work reveals the seismic failure process and mechanism of anti-dip jointed rock slopes,and could provide theoretical reference to the disaster prediction of anti-dip jointed rock slopes under earthquakes.
文摘Rock blasting is a dynamic process accom panied 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.
