Progress and prospect of urban underground space resources evaluation

Utilization of urban underground space resources (UUSR) is one of the most effective approaches to expand urban space, optimize urban structure, solve city problems, improve city management and achieve high-quality development. The comprehensive evaluation of underground space resources is the premise of ensuring the safety utilization of underground space. This paper systematically analyzes the resource attribute and evaluation status of UUSR, and sorts out the major evaluation methods of UUSR and the application progress in different cities. It shows that the current evaluation of UUSR mainly adopts analytic hierarchy process and expert scoring method to assign value to the evaluation indexes, and to evaluate the exploitation and utilization of suitability, resource capacity, quality, value and development potential of UUSR, which is characterized by various evaluation purposes, extensive content and distinctive indexes selection. However, there are also some problems, such as strong subjectivity of weight assignment, and imperfect evaluation model, etc. Based on the analysis of urban underground space resources evaluation, the trend of UUSR evaluation is analyzed from the perspectives of collaborative evaluation of various underground resources, three-dimensional evaluation of whole space, and response evaluation of geological environment, which could provide valuable reference for the UUSR evaluation and utilization.