Comprehensive Evaluation Of Suitability For Development And Utilization Of Underground Space In Qilin District Of Qujing

With the rapid development of urbanization,the urban population has grown rapidly.In the near future,the urban population will reach saturation.The saturation of urban population will cause a series of environmental and resource problems,which will bring us new challenges in urban planning and construction.In order to promote the sustainable development of the city,it is necessary to develop and utilize underground spaces with expanded urban capacity and improved urban environmental quality.The underground space is different from the above-ground space.The construction conditions of the underground space project are complex and easy to affect the surrounding environment.Therefore,it is necessary to find out the underground space stratum structure,carry out the geological environment characteristics research,comprehensively consider the geological environment and economic factors,and establish a reasonable The underground space evaluation model is targeted for the suitability evaluation of underground engineering,supplemented by 3D visualization geological model,and provides more technical support for the development and utilization of urban underground space.The main contents of this study are as follows:(1)Construct an evaluation index system for the development and utilization of underground space.According to the different forms of underground space development and utilization,the evaluation index factors are selected by comprehensively analyzing the main geological environment influencing factors and economic factors of different projects in the underground space,and the evaluation factors are divided into common factors and sensitive factors to establish underground space development and utilization.Urban comprehensive pipe corridor project,foundation pit engineering,underground traffic tunnel engineering suitability evaluation index system.(2)Establish a suitability evaluation model for underground space development and utilization.The G-AHP comprehensive evaluation method is used to classify the geological conditions of underground space.For the evaluation factor,consider the internal differences of various indicators and the impact of different combinations on the evaluation results,establish the evaluation factor grading standards and standardize the treatment.The evaluation factor grading standard introduces the numerical simulation method,selects the underground space development and the most widely used foundation pit engineering,and establishes the MIDAS numerical model.According to the simulation results,the classification criteria are defined according to the soft soil,stratum combination and submerged depth of the evaluation factors.(3)Implementation of the evaluation model for the development and utilization of underground space in Qilin District based on ArcGIS.According to the comprehensive evaluation model and index system of underground space,the spatial analysis technology of ArcGIS is used to analyze and superimpose the evaluation factors.The Qujing Qilin District is used as the evaluation model research area to study the geological environment characteristics of Qilin District,and the evaluation factors are selected to realize the Kirin.Comprehensive evaluation of the suitability of the integrated urban corridor project,foundation pit engineering and underground traffic tunnel engineering.(4)According to the drilling data of the Qilin District project,a three-dimensional geological model is constructed to express the geological conditions of the underground space more intuitively and accurately,and the three-dimensional display of suitability is divided into three parts according to the comprehensive evaluation results.