Research on 3D GIS-Based Suitability Evaluation of Engineering Construction of the Quaternary Paleo-channel Sedimentary Area

Based on the 1:50 000 comprehensive geological survey in Chudianji, Gaoluji, Jiangji and Wangdingji of northern Anhui Province,this paper determines the Quaternary geological structure,the engineering geological stratification, and the spatial distribution characteristics of maotang paleo-channel. It also builds a 3D geological structure model on the basis of multi-source data and experts'experience. Considering the geological conditions of foundation, engineering and hydrology, nine evaluation factors related to engineering construction are used in the Delphi method. Based on AHP and multi factor comprehensive index evaluation method, the evaluation index system and calculation model are established. 3D GIS analysis and evaluation method are used to comprehensively evaluate the suitability of shallow engineering construction within 50 meters in the area, and delineated different levels of suitability. Pearson correlation coefficient method is used to analyze the correlation between the evaluation results and individual factors, revealing the influence relationship of factors in the process of engineering construction.