Spatial calculation model for portal double row anti-slide piles

Since single row anti-slide piles is not capable of providing efficient bracing structure under larger sliding-force,portal double row anti-slide piles,which have the advantages of less displacement in the top of the piles and large anti-force,can be used to reduce the piles deformation.However,the calculation models of double row piles in prior ignore the interaction features of piles,beams and soils;and the calculation results based on the models are not accurate enough.Taking portal double row anti-slide pile as a single-layer multi-span frame affected by piles,beams and soils,and analyzing spatial coordinative interaction between top ring beam and link beam,as well as the affection of soil arch effect on the frame,a spatial forces model of the portal double row anti-slide piles is presented.A deformation equation is established by using pile lead border condition,continuous deformation of strong point,static force balance and deformation compatibility between top ring beam and pile lead.A program is developed by finite element method and Winkler beam on elastic foundation method.Finally,the model is applied to the test of the Three Gorges reservoir area prevention and curing project;and the result shows it is suitable for similar engineering.