Research On Rock Broken Phenomenon Under The Varying Concentrating Jet Intensity

The thesis is to study the different destructive effects under the different jet strength. Compare with the rock-breaking effect under the small aperture shaped jet, This research is more complicated. As in high-speed jet impact load, the destruction of rock to complete the effect is instantaneous, so it is difficult using experimental equipment or photographic equipment observed , and large aperture grain type of explosives used, the planar structure parameters, detonating devices are different small aperture, its jet plane features rock-breaking under conditions also different from the small aperture characteristics of the damage. This paper application of theoretical analysis and computer simulation of combining method.In the process of theoretical analysis, the article integrated use of jet theory, damage theory and fractal theory to analyse the dynamic damage rock (crack formation) process. In the process of using computer simulation, by changing parameters to get the jet on the rock under different jet strength characteristics of the damage results contrast, the law identified by contrast, the analysis of rock to fracture and the dynamic intensity corresponding jet relations. Finally the conclusions reached by the use of practice to test it. Through computer simulation repeatedly identified the best results corresponding to undermine the best jet parameters, the best parameters use of jet field test, thereby reverse verify the accuracy of computer simulation results. So far will solve the key issues of this item.This article uses large-scale finite element method software ANSYSLS—DYNA to research the rock destroying effect under the diversity gathers energy jet current intensity. Numerical value model is composed by metal jet current and rock mass , the metal jet current material adopt the Euler net lattice to build a model , the rock adopt the Lagrange net lattice to build a model. In this article the rock mass adopt ~* MAT_PLASTIC_KINEMATIC, may simulate the broken phenomenon of rock to a certain extent. The numerical value model adopts cm-g-unit system.Jet current infringing upon to the rock destroys by all means specifically for gathering an energy, the article selects 8 kinds of different speed ranks , respectively is: : 600m/s, l000m/s, 1400m/s, 1800m/s, 2100m/s, 2300m/s, 2400m/s, 3000m/s,the rock selects the sandstone, dali-stone and granite. The numerical value ANSYSLS—DYNA applying the finite element method software is carried out on to destroying process imitates , the three kinds of stone in this eight kinds of different shaped jet speed that is in different jet shear strength of transgression has different damage effects, through comparative analysis of sandstone shaped jet cutting undermine the invasion depth, revealing out the corresponding relationship between the different shaped jet strength and the depth of invasion. The application linearity return to establish speed and depth of cut transgression between the two-dimensional relation curve. Thus reveal out the damaged rock effect under the diversity gathering energy jet current intensity.