地铁隧道浅埋暗挖施工对既有桥桩的影响分析-市政工程专业论文.docxVIP

万方数据 万方数据 Subject : The Study of the Impact on the Existing Bridge Pile by Subway Shallow Excavation Specialty : Municipal Engineering Name : Xiong Jiaquan (Signature) Instructor : Gu Shuancheng (Signature) ABSTRACT In recent years, with Chinas rapid urban development, the traffic congestion on the ground is being serious, which causes people more and more put their eyes on the use of underground space resources. To ease the traffic pressure on the ground, major cities have been constructing the underground rail transit. Subway tunnel construction under more restriction by ground and underground environmental, at the time of crossing near building foundations will lead to the displacement of the soil around the foundation, thus making the pile to generate additional internal forces and deformation, resulting in the overall appearance or uneven settlement of the upper structure, thereby endangering the safety of using bridges and buildings. Therefore, there is a important reference significance for construction.to study the impact of exit pile foundation duing to Shallow Mining Method construction. In this paper , based on Summarizing of previous research results, the relationship between tunnel excavation and pile displacement ,axial force and friction being analysised,the main work is carried out in the following areas: Analysising the soil displacement and main factors induced by tunneling, Loganathan analytical solution formula is used to calculate the displacement of soil caused by tunneling. The influence of existing bridge piles caused by soil vertical displacement is anysisied, then a single pile and pile group displacement equations by shear displacement method is established, solving equations and gaining the pile displacement and axial force function. A single pile and pile group displacement equations by shear displacement method is also established before the tunnel excavating, solving equations and gaining the pile displacement and axial force func