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Nanjing, China

Wang H.,China Railway Tunnel Survey and Design Institute Co. | Zhang X.,Nanjing Metro Group Co. | Huang B.,China Railway Tunnel Survey and Design Institute Co.
Modern Tunnelling Technology | Year: 2013

To reduce the construction risks associated with long-distance river-crossing shield tunnels, such as the cross passages and intermediate ventilation shafts of the Nanjing metro line 3 and line 10 projects, and to ensure normal vehicle driving conditions and prevent disasters, a type of cross section with a single tube, double tracks, and three levels was proposed. This selection was made after performing a comparison and optimization of river-crossing tunnel options, cross section designs, internal structural layouts, and construction methods. The results show that, except for reducing construction risks and meeting the operation and disaster prevention requirements, it can maximize the utilization of tunnel space and give full play to the traffic capacity with significant social, economic, and environmental benefits. Source


Zheng Z.,Southwest Research Institute | Gao H.,Nanjing Metro Group Co.
Modern Tunnelling Technology | Year: 2014

In this paper, the structural problems of a box-type subway tunnel and their impact on structure safety is analyzed considering such features as large integral rigidity, vulnerability against deformation, and likelihood of being affected by surrounding construction activity. The index and control values of safety monitoring for this type of structure are presented in accordance with a statistical analysis of cross section, space deformation, and internal force features of a box-type tunnel under the influence of surrounding construction activity. The results of this analysis and its application show that the proposed method for defining the index and control values for safety monitoring is safe and reliable and can provide a reference for structural safety monitoring in similar works. ©, 2014, Editorial Office of "Modern Tunnelling Technology". All right reserved. Source


Yang S.,Nanjing Metro Group Co.
Modern Tunnelling Technology | Year: 2014

Using modern information technology to monitor urban rail transit engineering in real time is one of the effective means of controlling safety risks of underground works. Based on the safety risk management system and control standards, a professional information management platform is developed that incorporates all sorts of data and information from various parties involved and uses modern techniques in terms of IOT, cloud computation, network communication, and GIS to monitor the safety of underground works through artificial, real time, on -site, and video monitoring means. This platform integrates hardware and software and covers major management elements like monitoring, supervising, evaluating, early warning, and emergency response. This is a comprehensive solution to engineering safety risks from the aspects of technique and management. Source


Zhang X.,Nanjing Metro Group Co. | Jiang Z.,Key Laboratory of Road and Traffic Engineering of State Ministry of Education | Li X.,Key Laboratory of Road and Traffic Engineering of State Ministry of Education | Hu H.,China Railway 14th Construction Bureau Co.
Modern Tunnelling Technology | Year: 2014

Aiming at a tunnel driven by a large-diameter slurry shield passing beneath embankment, it predicted embankment subsidence based on the simulated calculation through 3D non-linear finite element model established with finite element software ANSYS10.0 and considering the combined action of structure, soil, and tunnel. Meanwhile, a numerical analysis on such construction parameters as slurry pressure, shield posture and synchronous grouting was carried out to understand the construction parameters and relevant ground settlement law, and to verify the validity of this prediction method. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved. Source


Yang S.,Nanjing Metro Group Co.
Modern Tunnelling Technology | Year: 2014

Aiming at safety risk management and control in urban rail transit construction, a standard system of safety risk management and control technology standards for the civil construction of underground works is presented with a focus on key points and core technology. Firstly, the risk identification and grading standards are set up regarding the underground engineering and surroundings. Secondly, design standards for safety risk control are proposed on the basis of geotechnical surveys and environmental investigations. Thirdly, a safety risk early-warning system combining monitoring, patrolling and an integrated warning is presented along with its reference standards. Engineering practice shows that this standard system is applicable, feasible and scientific. Source

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