Study On The Force Characteristics Of Double Row Antislide Pile Taking The Landslide In LiuJiapo As An Example

The Liujiapo No.2 landslide is a loosely sloped landslide in Jixian County,Ankang City.The proposed ring road passes through the middle part of the landslide.In order to ensure road safety,it is necessary to study the impact of the landslide on the highway.When the thrust of the landslide reaches 2000KN/m,the single.row pile or general retaining structure can no longer meet the requirement of anti.sliding force,and the landslide management is particularly difficult due to the limitation of topographic conditions and difficulties in land acquisition in southern Shaanxi.The row anti.sliding pile can not only meet the anti.sliding force,but also solve the layout problem,and it can also reduce land acquisition.Compared with other supporting structures,double.row anti.slide piles have the advantages of high rigidity,good stability,convenient construction,no need for lateral support,and good stress conditions.However,due to the fact that the force characteristics of double.row anti.slide piles are more complex than that of single row piles,the research is not yet in depth,theoretical research and engineering applications are disjointed,and the calculation method for the thrust of each row of piles is mature enough,resulting in inaccurate distribution of thrust,resulting in Waste of materials,or insufficient thrust of a row of piles,poses a great threat to the life and property of landslide.threatening people.Strengthening the design theory study of anti.slide piles,detailed analysis of the force characteristics of double.row piles,and the development of corresponding specifications are currently a critical task.(1)This paper takes Liujiapo No.2 landslide as the research object,uses the transfer coefficient method to calculate the residual sliding force of the landslide,and uses the Midas/GTS 2D simulation analysis to obtain the stress and displacement of the 2 section rainfall.The contour line graph and the stability coefficient are basically in agreement with the results of the transfer coefficient method and the site of deformation;(2)Comparing with the previous calculation method for the thrust of the double.row piles,the force analysis of the three.part soil and the two.row piles under double row piles is performed.The calculation of back row piles has basically reached a conclusion.The calculation of the deformation thrust caused by the deformation of front and rear rows of piles in the front rows has not been determined.This article will consider the loaded sections above the slip surface as cantilever beams and anchorage sections.The calculation formula of pile body deformation thrust is deduced for the elastic foundation beam;(3)The Midas/GTS was used to analyze the two.dimensional pile under the control of double.row piles,and the shear force and bending moment of the landslide anti.slide pile were obtained.From the cloud map,the anti.slide pile can be seen very intuitively.The internal forces near the surface and in the middle of the anchoring section are the greatest,which provides reference for the calculation of the reinforcement of anti.slide piles on landslides.