Analysis of Internal Force of Anchoring Anti-slide Pile Based on Double-parameter Method and Weighted Residual Method

Anchoring anti-slide pile is a new type of anti-slide retaining structure,there has not regulation for its design and calculation methods.Based on double-parameter method and weighted residual principle and by employing B-spline function as trial function,a new method for calculation of whole internal forces of anchor anti-slide pile was proposed,in which anchorage force acted on pile top and various pile bottom supporting conditions were considered.For the different controlling differential equation of loading section and anchoring section of anti-slide pile,the subdomain least square collocation weighted residual method was adopted,universal equation for calculating the pile internal force was derived and its treatment was programmed.Simultaneously,the pile can be analyzed as a complete entity,it is not necessary to divide the pile into two segments by the sliding surface,and the deformation harmony of the anti-slide pile and anchor can be also considered.The proposed method was applied to two engineering examples,and compared with traditional lookup-table method and finite difference method.The analysis and calculation shows that it can obtain high precision only with very sparse grids with short time to greatly improve calculating efficiency.