Interactive Analysis Of Ground Building And Underground Cavern

With the development of the construction in China, it becomes more and more obviously that building structure on the underground engineering such as making foundation and so on. If it is depended on the hypothesis of rigid base without regard to the interaction of structure and foundation with caverns, the result will be unreasonable and cause a big discrepancy between calculation and reality. Structure, base and foundation with caverns are an organic whole which connect and influence each other. The interaction of structure and base become an unavoidable key scientific question in some important projects.This dissertation is regarding one real project-the Building of communication in Hubei Province as the research example to make the spot-test of interaction, establish efficient macro analysis model and use the finite element program (ANSYS) to study the failure mechanism of interaction and stability of caverns and so on.The main contents and results are showing as following.The general situation of project and making caverns are introduced. The property of soil around the structure by the spot-test and reconnaissance is dissertated. It provides reliable parameters with continuous analysis.According to the characteristic of excavation, an optimal project is selected by analyzing different projects of excavation bracing. The process of excavation in three-dimension is simulated.The interaction of making foundation and excavation is described in this dissertation. It is gotten the deformation of making foundation under excavation by using Mindlin's stress formula. The influence of caverns to the stability is discussed by analyzing the deformations of excavation with caverns and without caverns.The stability of caverns is analyzed by calculating the interaction of caverns and structure in three-dimension. It is shown that the stability of caverns will be affected if the structure is built on them. And the caverns become from stable condition to unstable condition with the height rise of structure. Even more it will affect the use of structure and making foundation. The project of reinforce suiting for caverns in this dissertation is gotten by selecting different projects and combining the engineering example. By calculating the interaction of caverns and structure after reinforce in three-dimension, it is indicated that the deformation of caverns reduces greatly after reinforcement and the caverns are safe.The influence of buried depth of foundation on the stability of caverns is analyzed after reinforce. And the stability of caverns is developed as buried depth of foundation increasing. It is shown that the caverns become unstable as buried depth of foundation increasing. Therefore, the minimal buried depth of foundation is gotten.