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      Cutter-disc consumption during earth pressure balance tunnelling in mixed strata

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          Abstract

          The wear of excavation tools is considered to be one of the critical factors affecting the scheduling of shield tunnel construction. There is presently no effective countermeasure to prevent severe wear of excavation tools during tunnelling operations in complex geological formations. In addition, such wear is likely to lead to other problems, such as face instability and an unfavourable rate of tunnel advancement. The study reported in this paper analysed the various factors that affected the wear and performance of excavation tools during earth pressure balance machine tunnelling at the Ma-Lian section of line 9 of the Guangzhou metro, China. It was found that tunnelling in mixed ground conditions (upper soft and lower hard strata) led to severe wear of the cutter discs, resulting in additional costs and schedule delays. The foam expansion ratio, concentration of foaming agent and the foam injection ratio were measured to be 20, 2·5% and 40% respectively. Pre-grouting and effective soil conditioning were also found to prevent excessive wear of the cutter discs and surface collapse incidents caused by face instability.

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          Most cited references66

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          Long-term settlement behaviour of metro tunnels in the soft deposits of Shanghai

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            Flood risk assessment in metro systems of mega-cities using a GIS-based modeling approach

            Metro system is a vital component of mass transportation infrastructure, providing crucial social and economic service in urban area. Flood events may cause functional disruptions to metro systems; therefore, a better understanding of their vulnerability would enhance their resilience. A comparative study of flood risk in metro systems is presented using the analytic hierarchy process (AHP) and the interval AHP (I-AHP) methods. The flood risk in the Guangzhou metro system is evaluated according to recorded data. Evaluated results are validated using the flood event occurred in Guangzhou on May 10, 2016 (hereinafter called "May 10th event"), which inundated several metro stations. The flood risk is assessed within a range of 500 m around the metro line. The results show that >50% of metro lines are highly exposed to flood risk, indicating that the Guangzhou metro system is vulnerable to flood events. Comparisons between results from AHP and I-AHP show that the latter yields a wider range of high flooding risk than the former.
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              Numerical evaluation of land subsidence induced by groundwater pumping in Shanghai

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                Author and article information

                Journal
                Proceedings of the Institution of Civil Engineers - Geotechnical Engineering
                Proceedings of the Institution of Civil Engineers - Geotechnical Engineering
                Thomas Telford Ltd.
                1353-2618
                1751-8563
                August 2018
                August 2018
                : 171
                : 4
                : 363-376
                Affiliations
                [1 ]PhD researcher, State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean, and Civil Engineering, Shanghai Jiao Tong University, Shanghai, China
                [2 ]Professor, Collaborative Innovation Center for Advanced Ship and Deep Sea Exploration (CISSE), Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai, China (corresponding author: )
                [3 ]Professor, Institute of Tunnel and Underground Structure Engineering, School of Civil Engineering, Xi'an University of Architecture and Technology, Xi’an, China
                [4 ]Professor, Department of Civil and Construction Engineering, Swinburne University of Technology, Melbourne, Australia
                Article
                10.1680/jgeen.17.00117
                56cb5d32-c88f-493b-8144-3f633aa47f63
                © 2018
                History

                Quantitative & Systems biology,Biophysics
                Quantitative & Systems biology, Biophysics

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