Study On Creep Characteristics And Deformation Prediction Of The Northern Bedding Rock Slope Of Haizhou Open-pit Mine

With the development of China's industry,the safety of open-pit mine production has been paid more and more attention,among which the slope problem has become the focus.According to incomplete statistics,the northern slope of the mine has experienced more than 90 landslides since 1951.After years of governance,the northern slope of Haizhou open-pit mine has been18?20°,with a gentle slope shape and high overall stability.However,according to the scene investigation and monitoring,there is still a deformation and destruction trend in the north.Based on the actual situation of Haizhou open-pit mine,the creep deformation of the northern slope of Haizhou open-pit mine is considered.In order to explore the creep characteristics and deformation and failure of the northern slope of Haizhou open-pit mine,the following four aspects are mainly studied in this paper:?1?Geo Studio-SLOPE/W was used to conduct stability analysis of the slope.Based on the limit equilibrium theory,the Morgenstern-Price method was used to analyze the stability of the slope.According to the calculation results of the safety factor of the slope stability,the slope is stable,and the lack of groundwater will not affect the stability of the slope.Therefore,it is considered that the failure of the Northern Slope is not the overall slip instability,but the creep deformation failure caused by the creep of the slope.?2?This paper analyzes the creep characteristics of rock and soil and its empirical constitutive model.Through comparative analysis of seven empirical constitutive models,We can find that although the Burgers model and the Xiyuan model are often used to analyze slope creep,they cannot well reflect the accelerated creep stage.?3?In order to describe the creep process of the slope more completely,Burgers-Mohr model was used to analyze the creep of the slope.The principle of Burgers-Mohr model was introduced and its creep parameters were determined.The creep deformation mechanism of the slope is analyzed from the perspectives of micro,macro and strength.The induction effect of creep is put forward,and it is verified that creep of slope will lead to the decrease of safety factor of slope stability with the extension of time.?4?FLAC^3Dnumerical simulation software was used to endue the soft interlayer in the slope with creep effect.In order to clarify the variation law of deformation in time and space,the creep time was selected for 5?10?15 and 20 years respectively.The creep deformation of the northern slope of Haizhou open-pit mine under the creep action of rock mass is studied by comparing and analyzing the maximum principal stress,displacement and plastic zone in each period.The results show that with the increase of time,the creep deformation of the northern slope exists and the deformation value does not converge.The analysis result is in agreement with reality.There are 52 figures,7 tables and 62 references in this paper.