The Impact Caused By Pipe Jacking Construction And The Prevention Methods

Utilizing and empowering underground space is more and more important in city development. As an unexcavtion technology , pipe jacking have an unique excellence for it need not dig the ground surface. So it have been used widely in civil engineering. But pipe jacking construction inevitably brings about the ground and earth's surface movement and additional stress in soil and near structure. That is environment problem. If this ground displacement or additional stress is big enough , it will damage the construction around the pipe.The paper aimed at the problem caused by pipe jacking construction, first study the pipe jacking construction arts and crafts, study the appropriate terrene range of the difference pipe-jacking machine and their capability characteristic, discuss the key technology step such as grout tchnolege in pipe jacking.Combine the sewage pipe reconstruct engineering, the locale test and measure have been made. The test study change of the soil pressure, the touch pressure between pipe and soil, pore pressure, the movement of depth soil, the underwater level and the deformation of earth surface in process of pipe jacking . The penetration test study the disturbance of soil in difference location.By using finite element method, the paper study the stratum movement and the earth surface deformation caused by pipe jacking, analysis the construction parameter such as head pressure , deflexion, friction force impact on earth surface deformation, give the distributing rule and range of additional soil pressure in soil.The paper study the environment influence by calculate the additional stress in structure on earth surface, discuss the impact of difference factors such as the distance and the rigid, on additional stress in the strucure.According above all, the paper discuss the prevention and cure methods on environment problem caused by pipe jacking. According to analysis the influence types and influence factors, the paper aim at the characteristic of pipe jackingconstruction, give the correspond prevention and cure method. It have an use role for reference in future similaritv construction.