Study On The Application Of Large Diameter Round Anti-slide Piles

With the advance of infrastructure such as highway and railway in Guizhou Province,the tight construction project and construction of the project and other issues have become more and more obvious,So how to deal with slope stability quickly and efficiently,it has become the hot and difficult problems in the current slope management projects.Due to more mountainous areas in Guizhou Province,Terrain complex,although it has good anti-skid performance by using traditional artificial digging pile,because of its long construction period,to slope disturbance,prone to safety accidents and other shortcomings,Resulting in slope management projects often appear slope instability of the danger,to the people's safety and property caused a huge threat.Therefore,the fast,efficient,safe and economical slope support structure is a development direction and research focus of Guizhou mountain slope control project.With the development of mechanization in recent years,Round anti-slide pile have a very large upgrade in the anti-skid performance,At the same time,the circular pile in the construction process does not need to set the support,construction convenience,speed,do not need to support the advantages of the face,widely used in construction pile foundation and other projects.But at present it is very understanding for the round pile of the the deformation characteristics.On the basis of previous studies,this paper takes the highway slope control project in Guizhou as background,to analyze the anti-slide pile force characteristics through the traditional calculation and on-site monitoring,And verify the rationality of circular anti-slide pile support,At the same time,combined with large-scale numerical analysis software FLAC3 D to analyze the characteristics of large diameter circular anti-slide pile in different pile spacing,pile diameter and depth of anchor,etc.The optimal design parameters of large diameter circular anti-slide piles are analyzed,which provides engineering experience for the application of large diameter circular anti-slide piles in the slope engineering of Guizhou Province,and also provides reference for the subsequent design.The main research results are:(1)Through the comparative analysis of artificial digging pile and mechanical pile,It can be found that the circular anti-slide pile with mechanical perforation is superior to the rectangular artificial digging pile in the construction rate,safety,economy and convenient performance,At the same time due to the development of mechanical equipment,circular pile cross-sectional size has been greatly improved,to meet the needs of large-scale slope management.(2)Using on-site monitoring technology,The monitoring and analysis of slope and large diameter circular anti-slide piles are carried out,According to the deformation and stress distribution of the pile body,the pile force is analyzed,and the field monitoring value is compared with the theoretical calculation value.At the same time,the difference between the two is analyzed,which can be used for the subsequent engineering application and optimization of the design parameters of the pile.(3)A three-dimensional numerical model is established by strengthening the slope of large diameter circular anti-slide pile.The spacing,pile diameter and anchorage depth were analyzed by single factor method.When the parameters of the pile are changed,Pile deformation and stress characteristics,At the same time,the optimal range of pile spacing,anchorage depth and pile diameter is proposed.(4)Taking the horizontal displacement and shear strain of the slope as the discriminant index,Analyze the pile parameters optimized effect after reinforcement,At the same time,the optimized design scheme is compared with the original design scheme,The optimal anti-slide pile design scheme is obtained.