Analysis Of The Influence Of Partition Piles During Tunneling Excavation

Underground transportation systems have increased rapidly in many large cities these years in the world, especially those facing a problem with traffic. This system requires a tunnel construction which generates ground displacements and deformations which can affect the preexisting buildings and main services in urban sites and could lead to unacceptable damages. In an urban environment, many high-rise buildings are supported by pile foundations and tunneling almost invariably will cause ground movements, which in turn will impose axial and lateral displacement on the pile foundations. So it is important to research the effects of tunneling on soil around and adjacent pile foundations.In this thesis, the author first takes a review on the computational theories of the ground movements and pile responses induced by tunneling. Second, a brief introduction is made about theories of constitutive models and ground movements. Then a few words are said about the Finite Element Analysis Software-MIDAS, which is used to analyze the ground movements and pile responses in a three-dimension FEA model. Then taking shallow buried underground method for example, it sets forth the rules of ground movement. The constitutive model employed is Drucker-Prager plasticity with linear elasticity assumed within the yield strength surface.The main study of this thesis includes two parts. First, estimation of the multiple-field ground movements induced by tunneling ( both vertical and horizontal), i. e .,the effects of tunneling on soil around with the presence of the pile; second, the imposition of these movements on the adjacent pile and the computation of the consequent pile responses.The conclusions we draw can have the guiding significance to the design and construction of the large span tunnel construction.