Slope Stability Control Technology For End-to-side Coal Mining In Baorixile Open-pit Coal Mine

Side-assisted coal pressing in open pit mines is an important reason for the inevitable loss of coal resources.It has always been a hot issue researched by experts in the open-pit industry to collect as much coal as possible at the mining end before the internal discharge pressure.To study the slope stability control technology of side-assisted coal mining,and to determine the technical parameters and mining procedures of side-assisted mining,has practical significance for the safe and economical mining of some end-assisted coal.The main coal seams of Baorixile open-pit mine are 31 coals at the bottom and 12 coals at the middle developed in the whole area.The mining area is large and the side slopes are long.It is a typical soft rock open-pit mine,and the slope stability is mainly Controlled by the weak layer located 11 m below the 12-coal roof and located at the 31-coal roof,the stope landslide mode is the layer-cutting-layer sliding with the exposed weak layer as the bottom interface.If there is no weak layer below the 12-coal floor,Arc sliding may occur,and the landslide modes of the inner dump site are mainly landslides that occur along the surface contact surface of the dump site and landslides that occur along the weak interlayer at the lower part of the dump site.The thesis focuses on the research on the stability analysis of the side slope of the Baori Xile open-pit mine and the mining of the coal by the side.The rigid body limit equilibrium method is used to analyze and determine the morphological parameters of the stope to the boundary slope and the inner dump field,and the mining boundary is delineated.Through the construction of a three-dimensional numerical simulation model,the tracking distance of the inner discharge pressure of the 31 coal is calculated and analyzed.In relation to the stability of the slope,the design and determination of the technology to control the stability of the slope with the help of 31 coal mining and the corresponding lean mining plan,and the analysis and calculation of the replacement step distance when the 12 coal is mined with the help of the inner dump pit In relation to the slope stability,the design determines the technology of leaning 12 coal to control the slope stability and the corresponding leaning mining scheme.The research results have a certain reference and guiding role for the safe and economical mining part of the open-pit mine before the internal pressure relief.The paper has 34 figures,13 tables,and 51 references.