This paper numerically simulates the stress development and generates a three-dimensional model of the medium-length hole blasting in infinite rock mass for continuous charge and divided charge in blasting by using th...This paper numerically simulates the stress development and generates a three-dimensional model of the medium-length hole blasting in infinite rock mass for continuous charge and divided charge in blasting by using the large-scale nonlinear dynamic analysis software LS-DYNA and the elastic-plastic model ~*MAT_PLASTIC_KINEMATIC and JWO-EOS.The differences of the decreasing rate in Von Mises effective stress of blasting,element effective stress peak of free surface,bore wall stress and acceleration are investigated.It is shown that divided charge could greatly improve the blasting effect by engineering blasting practice.展开更多
Bench blasting is commonly used in open-pit mining.Some design parameters such as positions of hole packing and caving holes have great influences on the blasting effects.In this work,with a hybrid discrete-finite ele...Bench blasting is commonly used in open-pit mining.Some design parameters such as positions of hole packing and caving holes have great influences on the blasting effects.In this work,with a hybrid discrete-finite element method,numerical simulations of bench blasting are conducted,capturing the whole continuous-discontinuous processes.Considering two engineering cases,the influences of hole packing and caving holes are evaluated.The numerical results not only lead to some improved designs by relocating the packing positions and caving holes but also indicate the reliability of the adopted numerical tools.展开更多
基金National Natural Science Foundation of China （No. 51304087） Foundation Projects of Yun- nan Province （No. KKSY201404056, No. KKSA201121083）
文摘This paper numerically simulates the stress development and generates a three-dimensional model of the medium-length hole blasting in infinite rock mass for continuous charge and divided charge in blasting by using the large-scale nonlinear dynamic analysis software LS-DYNA and the elastic-plastic model ~*MAT_PLASTIC_KINEMATIC and JWO-EOS.The differences of the decreasing rate in Von Mises effective stress of blasting,element effective stress peak of free surface,bore wall stress and acceleration are investigated.It is shown that divided charge could greatly improve the blasting effect by engineering blasting practice.
基金the financial support by the National Natural Science Foundation of China(NSFC)(52178324).
文摘Bench blasting is commonly used in open-pit mining.Some design parameters such as positions of hole packing and caving holes have great influences on the blasting effects.In this work,with a hybrid discrete-finite element method,numerical simulations of bench blasting are conducted,capturing the whole continuous-discontinuous processes.Considering two engineering cases,the influences of hole packing and caving holes are evaluated.The numerical results not only lead to some improved designs by relocating the packing positions and caving holes but also indicate the reliability of the adopted numerical tools.
