Research on Construction Safety Risk Assessment of New Subway Station Close‐Attached Undercrossing the Existing Operating Station

Abstract

With the large-scale construction of urban rail transit, it will lead to the intersection and transfer of various lines, resulting in more transfer stations. The transfer station is a collection point for multiple subway lines, which is difficult to construct and has a high construction risk. The construction of the new subway station and the operation of the existing subway station are mutually influenced during the close-attached undercrossing construction. Considering the two objectives of ensuring the smooth operation of the existing subway station and the safe construction of the new subway station, this paper comprehensively analyzes the possible safety risk factors during the construction of the new subway station close-attached undercrossing the existing operating station and identifies 75 preliminary risk factors by means of literature review and on-site investigation. Then the Delphi Method and Entropy Weight Method are used to screen the preliminary risk factors, and the main risk factors with greater influence are retained, so that 49 key risk factors are obtained. According to the list of key risk factors, a safety risk assessment index system including 2 first-level indexes, 12 second-level indexes, and 49 third-level indexes is established. Based on the index system, this paper establishes a safety risk assessment model by using Analytic Hierarchy Process (AHP) and Fuzzy Matter Element Method (FMEM). The model first calculates the weight of each index by using AHP, calculates the comprehensive correlation degree of each index by using FMEM, classifies the risk grade of each index according to the comprehensive correlation degree, and determines the risk grade of the project. Finally, the safety risk assessment model is applied to the Dongdalu Station project of Chengdu Rail Transit Line 8. The result shows that the risk grade of this project is moderate risk, which is basically consistent with the actual situation, indicating that the model has good practicability. In this paper, a new safety risk assessment model for subway close-attached undercrossing construction is proposed, which fills the gap in the field of safety risk assessment for the construction of the new subway station close-attached undercrossing the existing operating station.

Research on Coupling Degree Model of Safety Risk System for Tunnel Construction in Subway Shield Zone

“…e term of "coupling" is originated from physics and is a phenomenon in which two or more systems or forms of motion interact with each other [20]. e risk coupling of the subway shield tunnel refers to the dependence degree of individual risk occurrence on the occurrence of other risks, and the degree of influence on other risks, the greater the dependence degree among risks, the greater the degree of coupling [21]. e calculation of system coupling degree can be realized by the N-K model, the coupling degree model, the interpretative structural model, and the nonlinear dynamic model.…”

Study on Settlement and Deformation of Urban Viaduct Caused by Subway Station Construction under Complicated Conditions

“…Many scholars have carried out a great deal of research work on urban safe construction and green construction [1][2][3]. A lot of scholars have carried out the related research work on subway safety construction [4][5][6]. As an underground linear project, the subway will intersect or underpass other projects in the construction process.…”

Environmental Risk Assessment of Subway Station Construction to Achieve Sustainability Using the Intuitionistic Fuzzy Analytic Hierarchy Process and Set Pair Analysis

“…In that paper, environmental risk was a part of safety risk. Luo et al [9] developed a safety risk assessment model using the analytic hierarchy process (AHP) and fuzzy matter-element method (FMEM). To the best of the authors' knowledge, no research has been reported to date on environmental risk assessment of subway station construction.…”

“…e choice of risk assessment model is another crucial task in the environmental risk assessment of metro station construction projects. Luo et al [9] used the FMEM to calculate the correlation between the geo-environmental risk indicators and classify the risk level of the indicators to determine the project's risk level. Since it is difficult to obtain accurate engineering data in construction engineering, Wang & Chen [20] proposed a systematic decision support method based on a fuzzy integrated Bayesian network (FCBN), which combines the fuzzy integrated evaluation method (FCEM) and Bayesian network (BN), to analyze the safety risk of subway construction projects under uncertain conditions.…”