Abstract

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Title:: Groundwater Risk Assessment by Interval-based Improvement of Analytic Hierarchy Process in Subway Project

Author(s):: ZHOU Nian-qing; GAO Yi-qun; HUANG Zhong-hui; ZHANG Shi-rong; Department of Hydraulic Engineering, Tongji University

Keywords:: interval-based improvement of analytic hierarchy process; fuzzy comprehensive evaluation; metro project; groundwater; risk assessment

Abstract:: The fuzzy mathematics theory was introduced into groundwater risk assessment in subway project, the interval number was instead of the fuzzy evaluation to determine the groundwater risk in the improved analytic hierarchy process. The railway station of Nanning Metro Line 1 was taking as the research object. Based on the area geology data and hydrogeologic condition, the groundwater risk was evaluated respectively from investigation, design, construction and operation phases. The membership degree was calculated by the Gaussian method, and the interval number judgment matrix was constructed, the complementarity matrix of interval possibility was used to correct the membership degree. The calculation results show that the construction quality and pumping management are the greatest influences on the groundwater risk in the construction process, such as the prevention of piping and running sand. According to the evaluation criteria of the interval number, the groundwater risk rating of Nanning railway station is good, and the results have reference and guidance for similar railway project about groundwater risk assessment.