Abstract: Carrying out comprehensive quality evaluation is a vital component in the development and utilization of urban underground space resources. Recently, the economy of Rizhao City has developed quickly, but underground space is not being used to its full potential. Due to the rapid economic growth of Rizhao City in recent years and the low rate of underground space utilization, it is urgent to conduct a thorough quality evaluation of underground space resources to establish a foundation for their rational development and utilization. This study evaluates the geological suitability and potential value of the underground space development in the main urban area of Rizhao City, the study area, establishing the geological suitability evaluation system and the potential value evaluation system, and combining the analytic hierarchy process and the most unfavorable discrimination model. Furthermore, a weighted method model and a constraint discriminant model were used to evaluate the quality of underground space resources. The evaluation effect of the two models was compared and analyzed. The results indicate that the subsurface space resources in the research area, which make up roughly 80% of the total area, are mostly of high or medium comprehensive quality. About 20% of the total area is made up of low-comprehensive quality areas, which are primarily found in the northern part of the study area and other sporadic distribution areas. The northern concentrated distribution area is primarily the area with low potential value for underground space development. Geological catastrophes include the destruction of historical sites, water supplies, and high-rise buildings, and seawater incursion primarily affects dispersed distribution areas. Furthermore, as compared to the weighted model, the evaluation results of the constrained discriminant model are more consistent with the actual circumstances of the study area, making it more appropriate for the comprehensive quality assessment of underground space resources in the study area.

Key words: urban underground space resources, geological suitability evaluation, comprehensive quality evaluation, constraint discrimination method, Rizhao City