Soft Broken Large And Thick Ore Body Safe And Efficient Mining Technology Optimization Research

With the all-round development of science and technology and economy,the demand for mineral resources in society is growing continuously.In recent years,due to the extensive and unprecedented consumption of natural resources,mineral resources which are relatively easy to be mined and high-grade,are almost exhausted,with mineral resource that is relatively difficult to be mined left.As a result,the proportion of extraction on this type of deposit has to be increased to meet the demand of natural resources.Extraction of the such ‘soft cracked large-thick orebody' are confronted with many technical difficulties,including extremely developed joint cleavage,unreliable ore-bearing rock,the high cost of artificial support,the collapse of the medium-length drilling holes,the unsatisfying blasting outcome,relatively low production rate and high dilute rate.In this paper,a research was introduced which is focuing on the case study in Sichuan Huili lead-zinc mine.This research was carried out based on mining technical conditions and indoor rock mechanics test and research,the main work done in this paper includes an analysis in rock mass classification,artificial support,and the optimization of the blasting parameters.As shown in the following are the specific research work in this paper:(1)Illustrating the huili zinc ore body mining technology conditions,and together with the present situation of the mine production and engineering status quo analysis sums up the problems existing in mines.(2)Conducting the experiment on indoor rock mechanics and investigation on engineering geology.Classify the rock mass quality with the method of RQD,Q system,CSIR and GSI,laying a solid foundation for the following research.(3)Carrying out the study which focuses on the ground support of scraper drift and ore-drive which are impact by the blasting activity and dynamic load.Simulating the statistics with software and then analyze the simulation result,raise a series of compound support strategy and carry out the strategy in the mine.(4)Determining the unit consumption of explosive in the blasting process,then optimizes the blasting parameter and improve the crater reaming and undercutting development.successfully addressing the problems,such as the rate of oversize fragment,hanging arch,the poor constructional condition of crater reaming and undercutting development,miss-fire and poor quality of medium-length hole and so on.(5)Conducting industrial experiment on soft thick orebody.Achieved relative ideal technical-economic indicator.Statistically,the loss ratio is 11.55%,dilution rate is 18.4%.Realizing safety and high efficient mining in Huili Zinc mine.