Study On The Whole Process Of Deformation Failure And Sliding Of Open-Pit Coal Slope

With the influence of mining depth and external factors,the open-pit coal mine landslide undergoes three processes of deformation,destruction and sliding.In order to study the whole process of slope deformation,failure and sliding,the paper simulates the whole process of deformation,failure and sliding of Fushun West Open-pit Mine slope through CDEM method,and systematically analyzes the disaster mechanism of the slope deformation,failure and sliding of Fushun West Open-pit Mine.The main part of the paper is the research content and results are as follows:(1)Establish criteria for deformation,failure,and slippage,provide a basis for subsequent numerical calculations,and calibrate different processes,which are roughly divided into the deformation compaction stage,the deformation stability stage,the failure stage and the slip stage.(2)The landslide model of Fushun West Open-pit Mine is proposed.The south side is a sliding shear type,and the north side is a dump-slip type.It also verifies the rationality of the proposed landslide model,and provides a theoretical basis and data reference for landslide prevention.(3)Study the slope deformation,failure,and slip evolution of the slopes of the south and north sides of the Fushun West Open-pit Mine under excavation conditions.Different degrees of cracks occur on the top,middle and bottom of the slope.With the increase of the excavation depth,the cracks continue to expand and extend,and finally penetrate the slope,causing a landslide.The deeper the mining depth,the more weak layers in the south bank are exposed,and the higher the probability of causing landslides.The open area of the north bank increases,the slope becomes steeper,and the scope of dumping and slippage is larger.(4)Study the evolution law of deformation,failure and slippage of the slopes of the south and north sides of Fushun West Open-pit Mine under the action of groundwater.Numerical analysis shows that groundwater has a greater impact on the slope,and the slip distance is longer than the excavation slip distance.The action of groundwater makes it easier to instability and damage the slope and eventually cause landslide disasters.(5)Study the evolution law of deformation,failure and slippage of the slopes of the south and north sides of Fushun West Open-pit Mine under the action of water filling.Numerical analysis shows that water is filled into the pit,which has the effect of presser foot,and makes the overall stability and deformation of the north and south sides.In summary,the paper uses the CDEM method to simulate the deformation,failure,and sliding process of the Fushun West Open-pit Mine,and verifies the landslide model of the south and north sides.The slope landslide needs to go through three stages of deformation,failure and sliding.The excavation depth After reaching the elevation of-164 m,a large-scale landslide appeared in the south bank,and after the excavation depth reached the elevation of-193 m,a local caving occurred in the north bank;groundwater had a greater impact on the slope,and the southern bank produced a large-scale landslide after the groundwater had acted on it.Stable slip,but with a large slip range;by filling the open-pit mine with one-third of the water,the presser foot effect can effectively prevent large-scale landslides in the south bank and dumping and slip phenomenon in the north bank.This paper has 83 pictures,6 tables,and 86 references.