Analysis of Roof Failure and Caving Mechanism in Multi-goaf Areas of Inclined Orebodies
The upper ore-body of Paishanlou Gold Mine is mined by open stoping method at the stage of open-pit to ground,and the goaf has been managed by the method of induced caving combining filling collapsed areas with surface waste rocks;the lower orebody enters into the scope of Haitang Mountain National Nature Reserve,and the surface is not allowed to collapse,but due to the low grade of the ore,the continuation of the traditional filling method will inevitably result in the prob-lems of low mining efficiency of the ore deposit and the poor economic benefits of the mine.Therefore,based on the engineering background of safe and efficient mining of low-grade orebody by filling method in surface conservation area,this paper summa-rizes the distribution and development law of cracks in overlying strata of roof with the help of RG underground television sys-tem monitoring results,the evolution mechanism of stress balance arch and caving arch is analyzed,and the formation condition of stable caving arch is put forward.Based on the on-site monitoring and the experimental results of rock mechanical parame-ters,FLAC3D numerical simulation was adopted to study the characteristics of roof failure and caving during the penetration and undercutting process of the inclined multi-goaf area,and to investigate the damage mechanism and stress-displacement evolu-tion law of the surrounding rock,as well as the dominant factors of induced caving,and a caving process control technology based on surface safety was proposed.Based on the results of the above study,it provides theoretical guidance for the develop-ment of a new type of filling mining process for Paishanlou Gold Mine,which can meet the requirements of surface conservation area as well as low-cost and high-efficiency mining,and at the same time,it provides reference for the design of mining methods for similar mines.
open-pit to underground miningon-site monitoringcaving mechanismroof failurenumerical simulationca-ving control
万方数据
维普
