Study On The Slope Stability And Comprehensive Treatment Of Landslide In The Western Slpoe Of Buzhaoba Open-Pit Mine

During the mining process of open-pit coal mine in our country,influenced by many factors such as the rock structure,geological structure and water,the local deformation,collapse and landslide often occur,which has a great influence on the safety production and energy supply of the mine.Therefore,it is of great significance to improve the safety level of mine slope production and the economy of mine mining to carry out the geological exploration and stability study of slope landslide,reveal the instability mechanism of mine slope under multiple factors,and establish the technical system of landslide prevention under different geological conditions.This paper takes the Xibang slope of Buzhuba open-pit mine as the research object,explores the regional geological conditions and landslide information of Xibang landslide of Buzhuba open-pit mine,obtains the rock mass mechanical parameters by field and laboratory experiments,and analyzes the slope stress,displacement,landslide mode and stability under various working conditions of Xibang mine.For different areas in the west of the province,the paper puts forward the plan of clearing square and reducing load,anti-slide pile retaining and comprehensive treatment of surface water and groundwater.The main work is as follows:(1)Comprehensively considering the formation structure,hydrogeology and the influence of artificial mining and other factors,based on the engineering geology and hydrology conditions of the Xibang of Buzhuba open-pit mine,the deformation characteristics of the landslide and the mechanical parameters of the weak structural plane are deeply studied.It is determined that the main control factor of the landslide of Xibang slope is the insufficient anti-sliding force of the weak structural layer of the slope caused by the seepage of the ancient river and mining activities.The whole process deformation characteristics and instability mechanism of Xibang slope are revealed.(2)The rock mass mechanical parameters were determined by field exploration,laboratory experiment and in situ experiment,and the finite difference software FLAC3 D was used to study the natural state of the present slope in Xidang and the slope stability under the condition of flooding.The natural state and the stability of the slope under the condition of flooding in each region of Xidang were defined,and the coupling relationship between the rock mass parameters and the landslide mode in each section of Xidang was established.The potential failure areas of slope stress and strain in the present situation of Xibang are revealed,which provides an important basis for the comprehensive treatment of Xibang slope in Buzhuba open-pit mine.(3)Based on the main control factors of slope landslide in Xigang,formation lithology,deformation and failure mechanism in each region and potential failure area,the influence of subsequent mining depth drop on slope stability in different regions was fully considered,and a variety of slope treatment measures were discussed.A comprehensive treatment plan of clearing square load reduction,anti-slide pile retaining and surface and groundwater treatment was formed.It is proposed to use the clear square load reduction scheme to clear the slide zone in the landslide affected area of404 tunnel,and adopt the anti-slide pile to support the Xibang 336-3X area with limestone base.It is also proposed to build and rebuild three flood control facilities and use horizontal drainage holes to ensure the stability of the Xibang slope.