Study On Chain Disaster Evolution Law Of Bedding Landslide In Open-Pit Mine

With the influenced of excavation,groundwater,rainfall and other factors,the bedding rock slope of open-pit mine evolves from a variety of geological disasters,such as ground deformation and ground cracks,which appear successively in chain effect,thus forming landslide disasters.Therefore,it is an urgent problem to make clear the chain evolution law of landslide disaster and do the corresponding prevention and control work.Therefore,taking the south wall of Fushun West open-pit Mine as an example,the chain evolution mechanism of bedding landslide is analyzed and discussed in detail based on the theory of system disaster chain dynamics,starting from excavation,groundwater,rainfall and other factors.The improved GDEM software is used to simulate the chain evolution process of deformation,tension-shear failure and sliding of the southern slope under the influence of excavation,groundwater rainfall,water filling and backfilling.The chain disaster evolution law of ground deformation,ground fracture and landslide of bedding slope in open-pit mine is summarized.The main research contents and results of the paper are as follows:(1)The criterion of deformation,failure and sliding of bedding rock slope is deduced,and the evolution process of bedding rock slope sliding is divided into deformation stage,failure stage and sliding stage.Based on the theory of systematic disaster chain dynamics,taking the south slope of Fushun West open-pit Mine as an example,the disaster chain evolution law of bedding rock slope ground deformation,ground cracks and landslides is studied,and the chain disaster evolution flow diagram of the south slope under the influence of excavation,groundwater rainfall,backfilling and water filling and other factors is established.(2)Study the chain evolution law of landslide disaster of south slope under the action of groundwater and rainfall.The results show that cracks of different degrees are produced at the top,middle,bottom of the slope and the soft interlayer,and ground cracks are produced on the slope surface.With the increase of the excavation depth,the cracks continue to expand and extend,and the ground cracks spread to the depth of the slope and penetrate each other,finally run through the slope,causing landslides.(3)Study the chain evolution law of ground deformation,ground fracture and landslide disaster of the south slope of Fushun West open-pit mine under the action of groundwater and rainfall.The results show that groundwater and rainfall soften and infiltrate the bed rock of slope and the rock mass on the edge slope,and reduce the strength of rock and soil mass,which makes the slope more likely to fail along the weak interlayer and cause sliding.At the same time,the slip distance of slope is longer than the collapse slip distance of excavation.(4)Study the chain evolution law of landslide disaster of south slope under backfilling and water filling.The results show that the water filling effect can backfill the pressure foot,make the sliding rock and soil mass fragments pile up at the bottom of the slope,effectively limit the sliding range of the slope,and reduce the sliding distance of the slope.Backfilling moves the failure sliding range of the slope upward and further reduces the failure sliding range of the slope.This paper describes the deformation,failure and sliding chain evolution process of bedding rock slope with weak interlayer through mechanical deduction.It uses the theory of systematic disaster dynamics and takes the south wall of Fushun West open-pit mine as an example to sum up the chain evolution law of ground deformation,ground fracture and collapse landslide disaster of bedding rock slope in open-pit mine.With the increase of excavation times of the southern slope,the range of slope failure sliding becomes larger and the sliding distance increases.The influence of groundwater on the slope is great,and the southern slope produces large-scale landslide after groundwater action.By filling the open-pit mine with 1/3 water,the effect of backfilling pressure foot can alleviate the large-scale landslide of the south side slope.By backfilling one third of the open-pit mine,the sliding distance of the slope is further reduced,which can effectively prevent large-scale landslide in the south side.Paper has 82 figures,4 tables and 75 references.