Evaluation Framework of Underground Space Resources of a Costal Soft Soil City: with Shangha as an Examplei
Wang JIANXIU1#+, Yujin SHI2, Hanmei WANG2, Xiaotian LIU1, Yansheng DENG1, Qiwei GU1, Daping CHEN2
1Tongji University, China, 2Shanghai Institute of Geological Survey, China

Multi-layers interbedded with sand, silt, clay and clayey soil are symbols of many coastal cities, such as Shanghai. Multi-aquifer multi-aquitard system is formed under the geological conditions. Soil and sediment with different depth and different lithology type fit for different purpose. How to evaluate the quantity and quality of the underground space is vital for the urban sustainable development. With Shanghai as an example, the evaluation frame work including both quantity and quality evaluation method is suggested. Quantity evaluation system considering developed and utilized resources, non exploitable resources, partially exploitable resources and fully exploitable resources was established. Quality evaluation system considering structural stability, engineering geological condition, hydrogeological condition, geological hazard, building height, development depth, underground resources were established. Finally, with Chenghuangmiao Temple strict as example, the evaluation frame was used and checked to provide reference for future city underground space plan.