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Kai Zhang,Wenbo Zheng,Cong Xu,Shougen Chen 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.5
This paper presents an improved assessment system to evaluate the risk of water inrush in tunnels in carbonate karst terrain based on extension assessment method. This system considers the karst geological conditions and selects nine main factors as evaluation indices that influence the water inrush in tunnels. The evaluation indices are quantitatively graded into four risk grades based on their values or expert judgement. The same-feature matter-element, classical domains, and sectional domains are constructed based on the nondimensionalization of the risk grades of the evaluation indices. The integrated weights for the evaluation indices are composed of the objective weights computed from measured values and the subjective weights derived from the Fuzzy Analytical Hierarchy Process (FAHP). The water inrush risk level of the evaluation object is recognized by the correlation analysis. The variable characteristic value makes it possible to further distinguish the water inrush risk of different objects having the same risk level. The accuracy of the assessment results of this proposed extension assessment system was verified by applying it in two engineering cases. This extension assessment system provides a practical tool to assess the risk of water inrush in tunnels in carbonate karst terrain.
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Feicong Zhou,Wenhao Fan,Ping Zhou,Mao Chen,Shougen Chen,Zhijie Wang,Yifan Jiang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.3
This study establishes a 3-D simulation model based on a real project, which reveals the problem that the metro structure deformation induced by unilateral excavation without any support exceeds the safety threshold. According to the metro structure deformation warning area, this study proposes a support technology that combines cover plate braces and diagonal steel braces. The research shows that the lateral deformation reduction ratio of the metro station under the diagonal steel brace is about 10% − 20%. The deformation reduction ratio under the cover plate brace is about 35% − 40%. To ensure construction safety, this study adopts the optimal support combination of 3 cover plates and 6+9+11 steel pipes. Monitoring feedback and simulation prediction shows that the comprehensive support system can reduce structural deformation by 56.1%, and effectively control the deformation within a safe range.
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