The Research On How The Seismic Waves Affect The Buried Water Pipeline

Urban Supply net is made up by water distribution and pipline, because of the large cover, it will affect the city life much when natural disaster happens such as earthquake. Mountainous and hilly areas are more serious for the complex pipe laying site. It makes sense to research Theoretical model of the pipeline seismic and calculation of parameters since now the research of this area is still on initial stage and lack of systemic theory, especially some key parameter.Based on many materials of earthquake disaster at home and abroad, the paper analyzes the destructive types of buried water supply pipelines and pipelines’mechanism under earthquake, comes up with the destructive interaction models and develops the analysis platform of buried pipelines which can make analysis of many aspects for the input forms and parameters of models.meanwhile it also puts forward relatively proper seismic models of pipelines and parameters of calculation. The models referring in the paper can be concluded as response deflection model, Fluctuation model, dynamic model of analytical, the relative deformation theory model as well as the quasi-static model. The parameters such as joint spring coefficient, the spring coefficient of soil and shear wave velocity are also analyzed in the paper. Aiming at the terrain characteristics of Mountainous and Hilly Areas, the paper mainly analyzes the bending destructive effects of foundation settlement resulted from earthquake action, puts forwards water supply pipeline’s bending deformation formula and analyzes the characteristics of bending deformation.According to MATLAB-GUI design, this paper mainly develops the pipline Seismic analysis platform which is distinctive on its hierarchy including Pipe and pipe structural; pipe-soil interaction model; site soil characteristics and mechanical properties of the pipeline. The rigorous numerical analysis showed that:(1) Buried pipeline could be divided into sub or continues tube according to its overall performance, a continuous deformation focuses on itself while the sub one is the connector.(2) It is more simple than the Relative deformation theory model and the results are conservative which is in line with the special seismic design.(3) The more serious earthquake, the greater Seismic shear wave velocity and leads worse damage to the pipline.(4) Joint spring rate affects the pipeline much:the greater the joint stiffness, the smaller the overall deformation of the pipe, so how to select the appropriate connector is the key to be against earthquake.(5) Spring coefficient of soil is also critical of the impact of the pipeline and hard ground soil is conducive to be against earthquake, so the pipline should try to avoid soft soil to reduce damage when buried. If no other choice, reinforcement measures are necessary accordingly.