Suitability Evaluation Of Geological Environment For The Development And Utilization Of Underground Geological Space In Chengdu City

With the rapid development of urbanization in our country,the rapid growth of urban population,the increasing size of the city,the ground space we can use is limited in scope,the survival of the human environment is deteriorating,so rational and scientific to develop and utilize of underground space resources has become an inevitable trend.Population density of Chengdu gradually increased,and the planning land can’t meet the needs of the current situation,so the city is gradually increasing pressure,which needs to be to the underground space,to improve land use efficiency and ease the pressure on the city.A lot of people crowded place in Chengdu City,the land use type single and utilization rate is not high,the before development of underground space use also caused a number of environmental geological problems.So,before the development and utilization of geological spatial resources,we should have a good grasp of the underground geological conditions of Chengdu City,and reasonable evaluation of the suitability of the geological environment.This paper is based on the project of "Dongying area and typical urban underground geological space using environmental geological survey",on the based of the full collection of geological data,geological environment data,the use of underground space and urban construction planning data in Chengdu city,combined field supplementary investigation,carried out a comprehensive analysis of the influence about various geological environmental factors in the development and utilization of geological space from the three aspects of the hydrogeological condition,the characteristics of the rock and soil and the geological hazards,combined with the Chengdu city in the geological work of expert advice,finally,10 geological factors,such as groundwater level,groundwater seepage,rock mass capacity,compressibility coefficient and slope failure are selected,and set up grading standards(I,II,III,IV),finally,using the AHP-fuzzy comprehensive evaluation method,combined with GIS,the suitability of the geological environment in the underground geological space of Chengdu city was evaluated comprehensively,evaluation results show that,geological environment more suitable area(II)of exploitation and utilization of underground space has a larger proportion,accounted for more than half of the total area of suitability evaluation,the second is the general suitable area of geological environment of exploitation and utilization of underground space,and the suitable area(I)of geological environment of exploitation and utilization of underground space has the smallest proportion.This paper combines the research results with the Chengdu city development planning,and puts forward suggestions for the next step of the underground space development in Chengdu city.