Assessment On Stability And Process Control Of Deposit Slope

On the arterial highways in the southwestern mountainous area of China,deposit slopes are a kind of high slope with very complex topographic conditions,which is usually in critical state.The slope is high and steep,and the type of rock and soil is complex.If it is affected by the engineering activities such as manual excavation and blasting,it is very likely that the rock and soil mass of the slope will lose stability under the action of self-weight and rainfall,which brings serious harm to the successful construction of mountain highway and the safety of highway operation later on.Based on the National Science-technology Support Plan Project,"Research on the control theory and dynamic control technology of roadbed catastrophe process of arterial highway in southwest mountainous area",this paper carries out a relevant research,introduces the concept of catastrophe mechanism process control,and sets a specific engineering example-the right landslide of interchange in Guizhou.Based on the results of the previous field slope data collection,field investigation and field deformation monitoring,the traditional mechanics theory and numerical simulation technology are fully used to reproduce the entire life cycle of the deposit slope from natural state to frontal excavation,rainfall instability to reinforcement.By studying the dynamic characteristics of slope deformation and stability,the dynamic evaluation of slope stability is carried out.On this basis,the paper puts forward the control principle of high slope catastrophe process,which is a breakthrough of traditional mountain highway high slope disaster prevention technology.The main research work is as follows:(1)This paper summarizes the research and theory on the stability and process control of the deposit slope at home and abroad,and systematically expounds the geological environment of the right landside of the deposit slope of interchange in Guizhou.On this basis,the formation factors and current situation of the landslide are analyzed.(2)Through on-site engineering geological investigation,relevant field data and physical and mechanical parameters of rock and soil are obtained,representative typical sections and sliding surfaces obtained by deep-hole monitoring are selected,and rigid body limit equilibrium method,a traditional method for slope stability analysis,is used to calculate the stability and residual sliding force of slope,and the safety factor of slope stability is calculated,stability evaluation and analysis of slope is carried out in accordance with the relevant specifications.(3)It introduces the principle of FLAC3 D numerical analysis,and establishes the three-dimensional numerical model of typical section of landslide by using software such as CAD,Sufer and FLAC3 D to reproduce the whole process of excavation,deformation,destruction,instability and movement of slope catastrophe.Through the analysis of slope safety factor diagram,displacement diagram,unbalanced force evolution curve diagram,plastic zone diagram and stress-strain diagram obtained by numerical simulation under different working conditions,combined with displacement monitoring map of characteristic points,the dynamic evaluation of slope stability can be realized by using deformation monitoring data.It provides a reference for dynamic evaluation of slope stability with high similarity.(4)Through explaining the idea and dynamic adjustment process in deposit slope treatment,this paper puts forward a practical treatment scheme according to the construction drawings of the landslide disposal,and uses FLAC3 D software to simulate its treatment measures.On this basis,the concept of process control of the catastrophe mechanism is put forward,which regards the slope catastrophe as a process,and recognizes and reproduces it through simulation technology.The landslide body should be regulated by choosing appropriate time,location and manner to make it reversed and stable.It provides an important basis for the demonstration of the research results of the timing and methods of slope catastrophe intervention.