Research On The Development Law Of Middle-shallow Landslides In The Dongbang Of Dulong Mine In Wenshan

The Wenshan Dulong mining area is a large open pit,and the high side slope of the east side of the mining area is a forward slope.After several decades of excavation and stripping,a high slope of nearly 500 meters has been formed.The rock mass is loosely broken and the weathering effect is strong.Under adverse conditions such as rainfall,slopes are prone to geological disasters such as landslides.The geological disaster in the mining area is serious,which has seriously affected the normal production of the mining area and the safety of the personnel in the mining area.The research area in this paper is the high slope of the east side of the mining area.Through detailed investigation and research on the east side of the mining area,there is now a landslide group formed by 42 landslides,of which shallow landslides are the main ones.The main factors affecting the stability of the east side slope of the mining area are the topography,geological structure,stratigraphic lithology,hydrological conditions,blasting vibration and slope shape transformation in the area.Among them,slope stripping,blasting vibration,mine truck transportation and continuous rainfall are the main factors that induce the occurrence of landslides on the east side of the slope,while the topography,geological structure of the slope body structure and stratigraphic lithology providethe basic condition for the formation of the east landslide group in the mining area.The influencing factors of landslides in the study area were refined and qualitatively analyzed the development rule of landslides in the east side of the mining area.According to the drilling process and on-site survey and the analysis and summary of the previous landslide survey data,the location of the landslide slip zone was obtained.The slip zone of the east landslide in the mining area was inversely analyzed by using the finite difference method and the limit equilibrium method.The inversion parameters were directly sheared in the hole.The data of the cutting test are compared and analyzed to obtain more accurate mechanical parameters of the sliding belt.Correlation analysis is performed on the selected mechanical parameters and physical property indexes to reveal the development law of the east landslide in the mining area from a quantitative perspective.The following knowledge and conclusions obtained are as follows:1.Among the landslides developed in the east of the mining area,there are 27 landslides in the strong weathered layer;15 landslides are located at the junction of the strong weathered layer and the middle weathered layer.The potential sliding surfaces of the east landslide in the mining area are all located Strong weathering zone.2.The parameters obtained through the inversion of the finite difference method and the limit equilibrium method are compared with the direct shear test in the hole.The parameters obtained by the inversion of the finite difference method are closer to the actual value,and the parameters obtained by the direct shear test in the hole are also more accurate and reliable.3.According to the correlation analysis between the physical and mechanical parameters of the sliding zone and the main physical properties,the density of the fissure body has a great influence on the cohesion,internal friction angle and shear modulus of the sliding zone of the landslide;The force has a greater influence,Porosity ratio and water content are relatively small,so they have a weak influence on the mechanical parameters of the sliding zone.