City Construction And Variation Research Of The Foundation Soil Predominant Period

The human activity influence on the predominant period of the site and foundation soil is obvious. With the quickening of the urbanization process and the change of the modernized urban idea, the underground construction of the big city will become great trend in the 21st century. Development of the underground space of large yardstick in the city , establishment of a large number of piles even overlengthy piles, application of the deep and big bases , reinforcement and treatment of the weak soil foundation , the drawing and polluting of groundwater, the additional stress of the city construction loads exerting to the geological body, the topographical change of city planning causing and city unique environmental effect (such as tropical island effect) and so on, influence the characteristic change of geological body and foundation soil.With the increase of city construction intensity, foundation soil' s structure and properties occur change, and cause predominant period and the vibration property of foundation soil to occur variation. If foundation soil predominant period and structure natural period are close to, they can produce resonance destruction, the many unusual phenomena can not be explained with using universal knowledge in the earthquake. Structure thing natural period usually is "definite value", but predominant period which may be "variable" is often neglected. Researching the city construction and the geologic body and the foundation soil predominant period variation, has important scientific meanings and economic benefits for the big, middle cities resisting earthquakes and reducing disaster, specially for the big, middle cities of different structure things providing seismic fortification.Based on the above viewpoint, this article summarizes the geologic body and...