Numerical Simulation Analysis Of Interaction Between Foundation And Ground Of Independent Silo

As a special towering structure, the theoretic analysis and structure calculation on silo are different from common buildings. Because of its special shape, foundation under the silo is often designed round or circular. Force condition of silo structure is complex. In order to ensure the normal usage of silo, it is of great practical significance to analyse the bearing capacity, stress distribution, settlement and deformation of foundation.In this passage, combined with a certain independent silo project, foundation soil strength and deformation parameters are determined with experiments on physical mechanics property index and triaxial compression test. Three-dimensional simulation model was build according to different plate thickness, different plate edge distance and characteristics of foundation soil. Through the model, the passage study on the interaction of foundation and basis with different situations. And the best basis is determined by the analysis and comparison on the bottom stress distribution and settlement and deformation of the four foundations which are round plate foundation, round beam slab foundation, ring-shaped slab foundation and ring-shaped beam slab foundation. The main achievement and conclusions can be given as follows:(1) The research status of bearing capacity of round foundation and the interaction of round foundation and basis, especially for the relative finite element method.(2) Analyzing displacement nephogram of two-dimensional and three-dimensional finite element simulation and comparing the settlement of two-dimensional and three-dimensional finite element simulation with the theoretical calculation settlement of circular plate foundation. The result shows that simulation results of three-dimensional finite element are consistent with the actuality, and close to the theoretical values, while the results of two-dimensional model do not meet with the actuality. So it is possible to build three-dimensional model for circular foundation based on finite element models software to simulate the interaction between the foundation and ground.(3) When the upper structure and the external loads are the same, we respectively analyze circular plant foundation according to different thickness, different edge distance and different soil mass by using the cam-clay model provided by ADINA software. The results show that: as the thickness of plate is increased, the stiffness of plate is increased and the range of stress distribution of the foundation plate is reduced and non-uniform settlement of foundation is decreased. Because the edge distance is decreased, the force area of plate is changed, the uneven level of stress distribution is increased and the force on circular plates is increased, while it almost has no influence on settlement deformation. As characteristics of foundation soil changed, it has little effect on stress distribution of round plate but has strong effect on foundation settlement.(4) Analyzing the different forms of foundation under the silo structure by finite element simulation, such as circular plant foundation, circular beam plate foundation, ring-shaped slab and beam plate foundations. Analysis from the bottom stress distribution,the stress distribution range of round beam slab foundation is the smallest and the stress distribution is the most reasonable. Analysis from the variable law of displacement, the settlement difference of the four foundations is all in reasonable range. The reasonable shape of the foundation is finally determined from economic and safe aspects. The result shows that the circular plate foundation is more reasonable.