BURIED LINES TRANSVERSAL NON-STEADY EFFECT CALCULATION

The problem of laying of underground pipes in seismic regions was solved by employing simple collar-beam. It is the most suitable decision for pipes with small diameter. Thickness of walls of pipes and large extent are taken as a basis of the calculation scheme. Such pipes are well calculated on seismic force. T.R. Rashidov and others calculated this model, and then the dynamic theory about influence of pushes of terrestrial layers of pipes was developed. As for underground pipes with large diameter, additional influence of sand layers is not considered here. If impact of the sand on pipes was considered, then more metal would be saved. Therefore, considering interaction of environmental sand with a pipe, it is important for now to calculate the direction of thin-wall pipes with big diameter to seismic pushes. Thus, it is very necessary to develop the model, which will be easy to calculate during engineering projects. In acceptance calculation scheme of pipes, we have to consider mechanical characteristics of sand, and also interaction of sand with pipes. As example of simple model, we can take Vinkler's model. According the Vinkler's model the movement of sand concerning pipes represents bilateral resistance.