Evaluation of urban underground space resources in a delta coastal city

Abstract

In the multi-aquifer and multi-aquitard system of a delta coastal city, urban underground space is filled with soil, sediment, and rock mass, as well as groundwater. Underground space can be created by excavating the layered strata. Urban underground space includes man-made structures, such as piles, underground structures, subway tunnels, etc. It is important to know how to evaluate the number of underground space resources. With Shanghai as background and the Zhongshan park urban plan unit as an example, a three-dimensional geological model for all sediment layers was established based on the geotechnical investigation. The number of existing underground structures was estimated using collected data. An underground space estimation method is introduced. The proportion of different layers was calculated using a geological model that corresponded to the shallow-middle-deep urban underground space conceptual plan, which can be referred to by underground space planning.