Study On The Damage Characteristics Of Hard Rock Targets With Strong Pulse Discharge

Strong pulse discharge and breaking hard rock technology is a good application prospect in the field of rock and mineral exploitation,stone fragmentation and blasting,and has the advantages of high efficiency,environmental protection and economy.However,due to the complexity of the impact factors of the strong pulse discharge,the mechanism and the power supply of the broken mechanism need to be further studied.This paper mainly focuses on the design of the key parts of the high energy and high power output,the design of the key parts of the power supply,the exploration of the factors affecting the hard rock breaking,the process and the damage characteristics of hard rock.The power output efficiency of the high power pulse discharge power is directly determined by the energy efficiency of the hard rock,but the efficiency of the energy output is largely determined by the performance of the power switch.In this paper,based on the requirement of power supply,the structure optimization of the existing gas switch is carried out,and the structure is optimized by using CST software.According to the uniformity of the electric field distribution,the optimal value of switch structure is determined,After the experiment,the performance of the optimized switch electrode was tested,and the performance requirements of the power supply of the broken hard rock was judged.There are many factors that affect the efficiency of the strong pulse discharge,including the shape of the output electrode,the distance between the electrodes,the insulating liquid of the media and the properties of the hard rock.In order to investigate the relationship between these factors and the efficiency of hard rock,the model is simulated by the particle field module of CST software.The results show that the output of the particle is in hard rock,and the distribution of electric field,electric field distribution,electric current density,charge density and electric field distribution are analyzed and compared.The movement of the particles in hard rock is observed.The distribution of electric field,distribution of current density,distribution of charge density,distribution of electric field energy and so on.Through the analysis and comparison of these electric parameters of distribution to determine the each factor of breaking the law of effect;finally,the experiment of the simulation,comparison and analysis of the available simulation and experiment conclusion remained the same,for future high pulse discharging crushing hard rock laid a theoretical foundation.It is a complex process that the strong pulse discharge broken hard rock is a complex process.The energy distribution,the hard rock impedance and the failure characteristics of rock are all the problems to be solved.In this paper,these problems are studied.First of all,it is equivalent to the broken hard rock circuit,by using Pspice software to simulate the energy consumption in hard rock and the change of hard rock impedance with time,the energy utilization rate of hard rock can be known.Secondly,by using the principle of conservation of energy and assuming that the hard rock is uniform rigid body,,the energy of the hard rock is converted into the energy of hard rock in the process of the electric breaking;Finally,the energy equivalence principle and the plasma channel are used as the cylinder,and the energy in the plasma is converted into the same energy TNT explosive,ANSYS/Autodyn software is used to simulate the rock breaking,and the energy distribution,the change of rock mass and the mechanism of fracture are analyzed,Thus the failure mechanism,the damage characteristics of hard rock,and the advantages of the crushing method of the strong pulse discharge power supply for hard rock are also found.