Research On Stability Of An Open-pit Hillside Type Dump Slope

Limestone mining is all over Chongqing,dump slopes are formed in the process of mine production.According to the survey,it is shown that most of the type of dump is hillside type in the city,namely heaping soil into slope in the original landform slope which basement is relatively steep dip.There's a real possibility that it will occur geological disasters,such as landslides and debris flows under the effect of heavy rainfall or earthquake.It do great harm to people safety of life and property,the mine`s production and safety environment.Therefore,study on the stability of the dump slope under the conditions of rainfall and earthquake has highly academic value and certain value for project.Taking a limestone open-pit hillside type dump in Chong Qing for research objects,Based on investigation of the engineering and environmental conditions in the region,adopt the limit equilibrium analysis,the finite element strength reduction method and the reliability analysis method,analyzed the displacement,stress-strain characteristics of slope under the natural conditions,rainfall,earthquake,earthquake and rainfall.The main conclusions of this paper were:1.Through the limit equilibrium method and strength reduction method and reliability analysis showed that the stackpile in natural conditions the safety coefficient was 1.301,the failure probability was 0.6%.It was in a safe and stable state under the action of self-weight loads.2.The saturated-unsaturated seepage theory was used to analyze the seepage field changes of dump slopes under short-term heavy rain,long-term heavy rain and continuous light rain,and the change of pore water pressure in time and space was summarized.At the same time,the displacement,stress,strain region and safety factor change of the slope under the effect of rainfall were analyzed.It was found that the most dangerous position of the slope was the slope foot region under the condition of rainfall infiltration.3.The response characteristics of displacement and acceleration of displacement and acceleration of slope under earthquake action was analyzed.It was found that the displacement and acceleration of the measured points in the soil and bedrock were different.At the same time,the maximum displacement of the slope occurred at the maximum surface of the plane under the action of the earthquake,and the variation of shear strain in the slope was summarized.4.The change of the displacement and plastic zone of the slope of the dump under the coupling of earthquake and rainfall was analyzed,and the changes of the safety factor and failure probability under the interaction of earthquake and rainfall and the individual action of the two parties are compared and analyzed.5.Comparison of calculation results by finite element strength reduction method,limit equilibrium method and reliability analysis method.The stability state of dump slope under the coupling condition of rainfall,earthquake,earthquake and rainfall was determined.This article revealed that the characteristics of the stability and the potential danger zone in the slope under the coupling condition of rainfall,earthquake,earthquake and rainfall,which can provide more the same type of mountain type mine slope disaster prevention and control work to provide the theory basis of science.