The Geological Environment Suitability Assessment Of Nanning's Underground Space Development

The practice of underground space development and utilization in worldwide shows that in-depth understanding the urban regional geological environment characteristics and strengthening the research on urban underground engineering geology problems are the basis of optimizing urban underground space development and utilization. At present, the information about Nanning's underground space is so few, the research also seldom reported, so study on the Nanning's underground space development and utilization is very necessary from the perspective of the geological environment.The geological environment suitability assessment of urban underground space development is a very complicated systematical engineering problem, which involves many index factors, both uncertainty factors and uncertain factors.Based on the large collection,summarizing and analyzing of geological data in Nanning, the paper analyzed deeply the relation of mutual constraints between geological environment and underground space development, adopted AHP method to set up the model for analysis on the principle of geologic structure, topography, rock and soil characters, hydro geologic conditions and geological disasters according the current utilizing situation of underground space, after each factor has been weighed, used the theory of fuzzy comprehensive evaluation to evaluate the suitable intensity of underground geological environment, which was classified four suitability grades(most suitable, suitable, secondary suitable and inappropriate), the result showed that their respective regions on the percentage of area were approximately: 20%, 30%, 40% and 10%.Additionally, the paper introduced the application of this model according to the actual geological unit, the results show that is in consistent with the objective reality. Finally, based on the geological environment in Nanning, the paper explored the effective ways of Nanning's underground space development and utilization, Made a number of recommendations.