A Risk Assessment Method for Metro Shield Tunnel Construction Based on Interval Number
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ORIGINAL PAPER
A Risk Assessment Method for Metro Shield Tunnel Construction Based on Interval Number Yeqin Zhang . Jiaming Zhang Cong Wang
. Hailin Guo . Yang Zhou . Guofu Ma .
Received: 11 December 2019 / Accepted: 27 April 2020 Springer Nature Switzerland AG 2020
Abstract In recent years, metro construction is flourishing in China. In the construction process of the metro shield tunnel, there are various complex potential risk factors fraught with many uncertainties. Therefore, it is crucial to conduct a risk assessment on urban metro shield construction. To improve the accuracy of the risk assessment results of metro construction projects, a risk assessment model based on interval numbers is proposed from the perspective of uncertainty. The experts’ evaluation information is represented by the interval number, and then the operation rule and membership function of the interval number is used to calculate the risk level of each potential risk factor. Afterward, the weight of each evaluation index is calculated based on the interval number and the C-OWA operator. From the bottom of the evaluation system, the layer-by-layer operation is carried out to determine the risk level of the assessment index of each layer, and the risk grade is divided according to the risk matrix. Taking a section of the shield tunnel of Shenzhen Metro Line 12 as an example, the proposed method is used to evaluate the Y. Zhang J. Zhang (&) H. Guo Y. Zhou G. Ma C. Wang Faculty of Engineering, China University of Geosciences, Wuhan 430074, People’s Republic of China e-mail: [email protected] Y. Zhang Sinohydro Bureau 7 Co., Ltd., Chengdu 610081, People’s Republic of China
construction risk, and the potential risk factors that require the implementation of risk prevention measures in the project are obtained. The calculation results show that the assessment model is reasonable and reliable, and has high stability. Keywords Metro Shield tunnel Interval number Membership function Risk assessment
1 Introduction With the acceleration of urbanization in China, the problem of urban traffic congestion has become increasingly serious. The metro has become a preferred solution in alleviating urban traffic pressure (Wang and Chen 2017), because of its advantages of fastness, safety, strong carrying capacity and land saving. China is placing a high priority on the construction and expansion of underground metro networks in urban areas (Ding and Zhou 2013). However, metro construction entails a typical large-scale and highly complicated system, which can bring enormous dangers to public safety (Shi et al. 2012; Zhang et al. 2014) The shield method, as a widely used construction method in the construction of subway tunnels, is very complicated and involves lots of potential risks. Geotechnical conditions, adjacent structures, and underground pipelines, etc. can also include significant risks during the construction of tunneling projects
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Geotech Geol Eng
(Wang et al. 2016). The res
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