Study On Construction Techniques And Numerical Analysis Of A Foundation Excavation Of Pipe Jacking Work Shaft In Changzhi City

The utilizing of city 3D space is more and more urgent as the development of city’s construction. Underground pipeline is not only an important part of urban infrastructure, but also is the material basis for the survival and development what was named “the nerves and blood vessels of the city”. In recent years, various kinds of underground pipeline construction have been gradually rising trend. Because of its not damage the environment, do not affect traffic, short construction period, low comprehensive cost, the social benefit Trenchless technology is remarkable advantages and increasingly brought to the attention of the society,Pipe jacking work well play a key role in the pipe jacking work that needs support all the jacking force horizontally direction. When the pipe jacking engineering design, at the top of the great level force repeatedly, work well can produce obvious displacement of lean back, and then affect the positioning accuracy of pipe jacking and rectify, make the pipe jacking deviates from the axis of the design. So, accurately calculating the permissible stress of the soil of back and controlling the stress and strain on work well have important engineering significance.This paper mainly describes the development and research status of pip jacking technology, through the drainage pipe jacking project in wuzhen street, Changzhi City, Shanxi Province. Introduction to construction process of work well, and obtain following conclusions through finite element analysis:1.Larsen pile have a great advantage during the construction process of well pipe jacking because of construction speed, no noise, can be recycled, and strength of assurance;2.The horizontal displacement magnitude of the soil of back reach to peak during jack, so we should reinforcement the soil on the front and rear jacking pipe work well on both sides.3.There are two aspects of horizontal displacement of the pipe jacking work well under the horizontal jacking force: First, is the overall displacement work well, this is based on the properties of soil around the well. On the other hand is woke well elastic deformation, the deformation of the shape and size was beard on the stiffness of the work well.4.The main influence of the maximum horizontal of stress and displacement values of work well is the stiffness of the soil around the work well. Raise the soil stiffness can reduce the rigid body displacement of work well, the thick of work well bedding layer is another important factor which influence the shaft displacement value of the integral structure of work well, the thick value can be increase properly.