Geological suitability evaluation of underground space development and utilization in piedmont alluvial plain cities: An example of Chengdu

The development of underground space is irreversible, and the unreasonable development will cause a huge waste of valuable underground resources.In order to improve the rational development and orderly utilization of underground space resources, it is necessary to make a preliminary evaluation of the suitability of underground space development and utilization.Based on the cooperative development and utilization of multi-resources in underground space and the reciprocal feed-back response of geological environment problems, an evaluation model based on "geological resources", "geological structure" and "geological problems" was proposed, that is, geological resources evaluation and difficulty evaluation of underground space development.Finally, a set of geological suitability evaluation model suitable for the development and utilization of underground space resources in piedmont alluvial plain city was established by using mathematical methods such as analytic hierarchy process, fuzzy comprehensive evaluation method and deduction method of restricted factors.The evaluation results show that the shallow underground space in the study area is not suitable for development due to the influence of existing buildings, while the middle-deep underground space is more suitable for development.The results can provide scientific basis and effective guidance for the development planning and construction of underground space in the study area, thus reflecting the rationality and scientificity of urban underground space development and utilization planning.