The Application Research On Treating Technique For Fa-Wo Interchange Area Slope Of Bi-Du Expressway

With the expansion of the scale of highway network in China,the construction of expressway is more developed to the mountainous area.Compared with the plain area,the slope of the mountainous highway is more complicated and has a large excavation depth,which makes it difficult to treat.Cost has also increased significantly.Therefore,how to scientifically choose the slope treatment plan,taking into account the economy and timeliness,has become a key concern in the process of slope treatment.This paper takes the excavation side slope of the large-scale road in Guizhou mountainous area expressway as the research object,and studies the stability and treatment options of the slope.The main contents and conclusions are as follows:(1)Through the investigation and analysis of the site situation of the slope,combined with the existing geological survey data and the previous slope monitoring data,the status quo and displacement deformation of the slope are analyzed in detail,and the obvious signs of sliding of the slope are preliminarily determined.The current slope is in a creeping stage and has an increasing trend.Through the analysis of the deformation process,influencing factors and slope failure characteristics of the section,it is shown that the main factor causing the slip in the early stage is continuous rainfall,and the secondary factor is the blasting and disturbance in artificial excavation.At the same time,combined with the reasons for the occurrence of slope slip,the calculation conditions and main parameters of the slope stability analysis are determined.(2)Combined with the actual construction conditions and characteristics of the slope,the scope and characteristics of the common treatment measures are analyzed,and the treatment plan is preliminarily formulated,and the three main aspects from engineering economics,construction risks and expected treatment effects are comprehensively considered,based on the fuzzy level.The analysis method establishes a comparison plan for treatment plan and determines the optimal treatment plan.(3)According to the actual characteristics of the engineering slope,the design of the treatment plan was carried out.The numerical simulation and analysis of the safety factor and stress-strain distribution of the treated slope were carried out.The numerical simulation results show that the stability coefficient of the slope after treatment is above 2.5,which can meet the check value of the treatment requirements,which can effectively prevent the occurrence of slope instability and verify the rationality of the treatment plan.