Study On Characteristics Of Associated Beam's Deformation And Stress Of Retaining Structure With Double-row Piles

Double-row piles supporting structure in the excavation support system is a new development form of support.This supporting form with the lateral stiffness of support,convenient construction,safety and economic advantages control gradually accepted by geotechnical engineering design personnel.For double-row piles supporting structure,associated beam has played a very important role in contribution and structure force transmission for supporting system,On the rules and mechanisms of action associated beam research,it is more critical.This article summarizes the consolidation of the existing domestic and foreign research status and achievements of double-row piles supporting structure,and double-row piles supporting structure commonly used calculation methods are compared and analyzed,However,due to the current theory of double-row piles is not yet ripe,it has not yet formed a unified theory of computation,Therefore,the use of double-row piles FEM stress analysis is necessary.This article also describes the use of finite element analysis of double-row piles retaining structure basic theory,and the method of analysis double-row piles retaining structure with the finite element software Midas GTS NX,Which can be considered pile-soil contact,simulate the construction process to ensure the accuracy of the results.In this paper,by using Midas GTS NX finite element software,establishing the same of actual excavation three-dimensional numerical model,analysis the pile lateral displacement and moment situation of double-row piles retaining structure,by contrast with the actual monitoring data,verify the validity of the model,on the basis of this model,analyze the effect of the associated beam on structural system,effect of the associated beam material properties on structural system,effect of the associated beam height on structural system and effect of the associated beam width on structural system,Summed up the relationship between the associated beam parameters with the double-row piles retaining structure lateral deformation and bending moment,research shows:the presence of associated beam,it is possible to effectively restrict the displacement of the pile,and adjust the internal force of the pile;Increasing the height of associated beam can reduce lateral displacement of the pile,But continues to increase the height,Control lateral displacement of the pile effect is not obvious,the proposed value of 0.5m ~ 1m;The width of the associated beam is necessary to meet thedisplacement control effect,but also to avoid too wide wasted material,the proposed value of1 m,it is the Pile diameter.