The Construction Finite Element Analysis Of Retaining Piles Working As An Anti-Floating Method

With the rapid development of the urban construction and a variety of large-scale publicfacilities construction, the underground space developed and utilized widely, but theunderground engineering anti-floating problems has become increasingly prominent,especiallyfor the anti-floating design of underground civil air defense projects with light weight and largearea is particularly important.On the basis of summarizing with regard to the Commonanti-floating measures, Many geotechnical engineers and scholars have been explored the newmeasures boldly, especially for the new anti-floating measures which beneficial to the reusingof resources and a design plan of retaining piles working as an anti-floating method has beenproposed by people.Although this program is convenient for construction and brings goodbenefits to the economic, but the method of retaining piles working as an anti-floating willactuate the structural changes in internal force and displacement, which will impair the safetyand durability of the structure severely.Therefore,the study on the influence of retaining pilesworking as an anti-floating method has important theoretical and practical significancce aboutpermanent structures.This paper employs ABAQUS software to take a numerical simulation of a typicalstructure model as experimental tablet, which is under the background of practical undergroundcivil air defense projects, The main work and conclusions are as follows：(1)According to the practical underground civil air defense projects, This paper hasanalyzed the method of retaining piles working as an anti-floating is feasible.Simultaneously, ithas proposed three possible connections between permanent structures, shear connectors andretaining piles and must reconsidered the issue of structure design after use the new measure.(2)Based on the analysis of alternative structural connections design schemes of shearconnectors, the structural changes in internal force and displacement under differentcomponents within the model is gained.The analysis showed：because of the groundwaterflotage, the stress of the permanent structure of the optimization program increases generally,especially the maximum stress increase of50%to the top plates, for the reason that althoughthe optimization program bring good economic benefit，but the internal force increase，thereforemust make a new design to structure；(3) The distribution density of shear connectors was changed to study the constructionperformance，arguing that more choices can be made according to the actual engineeringsituations.Considering the economic effectiveness of projects，the distribution density of shearconnectors can be increased properly，and the reasonable amount of the distribution density ofshear connectors is2or3； (4) According to the analysis of the different binding conditions of the pile-soil model,obtaining the displacement and the stress magnitude. The internal force of permanent structuresindicating a clear advantage for fixed constraints in retaining pile.While designing, besidessatisfying the request of the foundation pit deformation excluding, the pile length and thedistribution density of shear connectors should not be big excessively，which avoiding fixedconstraints in retaining pile effect.(5)Using the orthogonal design in mathematical statistics to analyze the connection waysof shear connectors, distribution density of shear connectors and the height of shear connectorsimpact of the internal force，to acquire the sort impaction of various factors on the stress anddisplacement which agrees to main structure.To acquire the sort impaction of various factors onthe stress and displacement which agrees to main structure.