Suitability Evaluation of Underground Space Development in Coastal Cities Based on Combined Subjective and Objective Weight and an Improved Fuzzy Mathematics Method

Shengtong Di, Yueheng Li, Caiping Hu, Yue Yuan, Zhongsheng Wang, Meijun Xu and Jie Dong ()
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Shengtong Di: School of Civil Engineering and Architecture, Linyi University, Linyi 276000, China
Yueheng Li: School of Civil Engineering and Architecture, Linyi University, Linyi 276000, China
Caiping Hu: Shandong Provincial Geo-Mineral Engineering Exploration Institute, Shandong Provincial Bureau of Geology & Mineral Resources, Jinan 250014, China
Yue Yuan: Key Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Qingdao Geo-Engineering Surveying Institute, Qingdao 266101, China
Zhongsheng Wang: Key Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Qingdao Geo-Engineering Surveying Institute, Qingdao 266101, China
Meijun Xu: Key Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Qingdao Geo-Engineering Surveying Institute, Qingdao 266101, China
Jie Dong: Key Laboratory of Geological Safety of Coastal Urban Underground Space, Ministry of Natural Resources, Qingdao Geo-Engineering Surveying Institute, Qingdao 266101, China

Sustainability, 2025, vol. 17, issue 15, 1-21

Abstract: The development of urban underground space is a necessary way to realize the sustainable development of the city, and it is also an essential means to solve urban environmental problems such as traffic congestion and resource shortage. Scientific suitability evaluation is the prerequisite for the rational planning and development of underground space. Previous studies have encountered problems such as an imperfect index system, a single weighting method, and loss of membership degrees in fuzzy evaluation, which have led to unreasonable evaluation results. Taking the northern coastal cities of Weifang as the research area, the evaluation index system is established, and the index weights are calculated by the improved structural CRITIC. An improved fuzzy mathematical evaluation model based on the weighted summation method is proposed to carry out the suitability evaluation of underground space development in the research area. The results show that: (1) The proposed method of combination weight and improved fuzzy mathematics evaluation takes into account the scientific weight and avoids the subjective bias, and also corrects the issue of membership degree loss in the membership matrix of comprehensive evaluation. (2) When the area of the grid unit is 0.02% of the area of the research area, the size of the evaluation unit is more reasonable. (3) The area that is very suitable for underground space development accounts for 8.69%, and the more suitable area accounts for 25.55%, mainly located in the northwest and central–southern regions of the research area. It can provide a reference for the suitability evaluation of underground space development.

Keywords: coastal cities; underground space; suitability evaluation; combined subjective and objective weight; improved fuzzy mathematics (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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