Study On The Interaction Between Silo Structure And Foundation In The Collapsible Loess Venues

As to the high-altitude development of thin-walled structures, Silo has not onlytowering structure characteristics, as well as loading large, high center of gravity, andits scale as wider and wider, so it has higher requirement for the foundation and basis,especially the bearing capacity and settlement of collapsible loess foundation is morestrict. Silo structure structure unlike the general building, the theoretical analysis andstructure calculations are more complicated, and previous theoretical calculations andexperimental analysis silo modeled as fixed lower end of the cylindrical shell structure,regardless of the impact between the foundation and the basis. However, the upper partand the foundation of the actual structure are interrelated, they joint action anddeformation in a whole system, the force and deformation are coordinated. In order tosimulate the actual situation well, analysis on the internal forces and deformation shouldmake superstructure and the foundation as a whole. But at this stage of the threerespective stiffness,foundation model and its parameter selection of the study ofinteraction effect is still not enough perfect, in-depth study of the impact of these factorson the interaction is the current urgent topic in geotechnical engineering, have importantpractical and theoretical significance.This paper comprehensive summarized the domestic and international theoriesabout the upper structure and foundation interaction research, analyzed the silo structureand foundation interaction mechanism at collapsible loess ground, based on theengineering example, using finite element software ABAQUS to simulate the upperstructure and foundation interaction and collapsibility of loess. When the upper structureand the external load are in same cases, researched the force and deformation of thefoundation by changing the margins and thickness of raft foundation, lime soil cushion layer thickness and the depth of the collapsible loess. With the increase of foundationstiffness, the whole stress of foundation increases, and local stress decreases, at thesame time, the ground reaction force increases gradually, and the differential settlementis less; Considering the interaction, the internal force and displacement change arereduced of the foundation and the base, the stress of the entire structure have alsoplayed a very good coordination function; determine the reasonable thickness anddiameter of the circular raft foundation through comparison. Before using lime soilcushion, when collapsible loess depth greaten, the differential settlement anddeformation of foundation and base both increased, and after processing, with theincrease of lime soil cushion layer thickness, basal counterforce distribution moreuniform, its settlement is obviously reduced, through the contrast analysis to determinethe scope of influence depth of collapse and the reasonable thickness of the lime soilcushion layer.