Study On Dry Filling Mining Technology In Xiling Mining Area Of Sanshandao Gold Mine

Deep mining has become an important part of deep resource development.After deep mining,the ground pressure phenomenon is obvious,the production technical conditions and mining working environment are getting worse,and the mining waste rock leads to a sharp increase in the pressure of the mine transportation system,which brings great challenges to the deep efficient production.At present,the Xiling mining area of Sanshandao gold mine is in the stage of deep development.The waste rock produced by excavation is transported from the deep ramp to-600m transportation level,and then transported to Xinli and Xishan mining areas for shaft lifting by electric locomotive.It has the characteristics of long transportation distance and more equipment.If the waste rock can be directly filled in situ in the underground stope without leaving the pit,This has great economic benefits for reducing the production costs of the mining area.In this paper,the experimental stope in Xiling mining area of Sanshandao gold mine is taken as the research object,according to the process characteristics of continuous dry filling sublevel mining method,the research and design work in the following aspects are carried out.(1)According to the field engineering geological survey and indoor rock mechanics test results,the rock mass quality classification method(Q/RMR/GSI)is adopted to classify the rock mass,and the rock mass mechanical parameters are determined based on the rock mass quality classification results and Hoek Brown strength criterion.(2)This paper introduces the continuous dry filling sublevel mining method and some deformation techniques.According to the occurrence space form of the ore body in the deep experimental stope of Sanshandao Gold Mine,the stability chart method is applied to calculate the maximum unsupported length of the experimental stope and the maximum allowable exposed length after supporting;Through engineering analogy method,theoretical analysis method and empirical chart method,the supporting parameters of roof anchor cable are designed,and the supporting effect is analyzed with the help of numerical simulation software.(3)The stress state of artificial bottom is analyzed,and the construction technology of artificial bottom suitable for the stope is put forward;The thin plate model and simply supported beam model are used to analyze the structure of the false bottom,the relationship between the maximum compressive stress and the thickness of the false bottom is extracted,the thickness of the concrete false bottom is determined,and the reinforcement design is completed;According to the requirements of various specifications,the design of reinforced concrete structure is checked,and the stress state of the false bottom is observed with the help of numerical simulation software to verify the stability of the false bottom structure.(4)According to the process characteristics of continuous dry filling sublevel mining method,the detailed engineering design of the design area is carried out,including the cutting engineering layout of the experimental stope,the construction design and cost analysis of artificial false bottom,and the stoping process design of the experimental ore body;Finally,the cycle time of each working procedure is calculated to obtain the production capacity of the stope.