Study On Seismic Force Model Of Underground Water Supply Pipeline

In the earthquake,the damage of water supply network directly affects people’s life after the earthquake.Previous research mainly aimed at the axial response of buried pipeline under seismic traveling wave,and neglected the influence of bending and torsion on the pipeline and the effect of water on the pipe.In this paper,the factors affecting the damage of urban water supply pipeline are analyzed in detail from the aspects of seismic intensity,the soil type,the material of pipe,and water etc.A certain research is carried out on the three aspects,which are the seismic force of underground pipelines,the earthquake resistance of underground water supply pipeline and the normal working time of the buried water supply pipeline under the action of seismic wave.The main research contents are as follows:Firstly,based on the elastic foundation model and wave theory,the buried pipeline is considered as the elastic foundation beam,with the connection of pipe and soil being regarded as a spring connection which makes pipe and soil be a vibration system.The models of the axial force,lateral force,torsional force and combined stress are built with combining the axial strain,the bending strain and the torsional strain of the water supply pipeline in the earthquake.Secondly,considering the influence of water flow in the pipeline to the damage of the water supply pipeline,combining some theory of fluid mechanics the stress models of the axial force,lateral force,torsional force,torsional stress and combined stress are established.Finally,according to the stress calculation model of buried water supply pipeline under the action of earthquake wave in this paper,combining the tensile strength of pipeline,the prediction model of normal working time of water supply pipeline under seismic wave is established.In this paper,the seismic damage model of buried water supply pipeline is established,which can be used as a supplement to the seismic code of underground water supply pipeline,and provide a basis for the seismic design of underground water supply pipeline.