Nanjing Metro Group Co.

Nanjing, China

Nanjing Metro Group Co.

Nanjing, China
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Sun Z.,Jiangsu Province Communications Planning and Design Institute Ltd Company | Zhang S.,Nanjing Metro Group Co. | Liu N.,Jiangsu Province Communications Planning and Design Institute Ltd Company
Modern Tunnelling Technology | Year: 2015

This paper states the basic operation principles of a hydrostatic level gauge and the factors influencing monitoring accuracy in a subway tunnel during operation. Combined with a monitoring case of a hydrostatic leveling system in an operational metro tunnel during construction of a foundation pit, the monitoring accuracy of the hydrostatic level gauge during a train shutdown is contrasted with that of train normal operation in order to analyze the influence of train operation on monitoring accuracy. Meanwhile, the reliability of the hydrostatic level system is verified by comparison with the manual monitoring data. The results show that the automatic monitoring system can meet the requirements of real-time monitoring accuracy for subway tunnel deformation during operation. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Jin H.,Nanjing Metro Group Co.
Modern Tunnelling Technology | Year: 2016

Grouting is an effective means to deal with geological disasters, but it may affect groundwater quality during construction. Using the Shangyuanmen station in Nanjing Metro as an example, this paper examines the influence of the new quick-setting grouts on groundwater quality by selecting eight monitoring points inside and outside the foundation pit and analyzing the sample data with a comprehensive evaluation method. The results show that the water quality factors near the grouting area are greatly influenced, while those outside the grouting area are slightly influenced, indicating that new quick-setting grout is applicable to underground works for which groundwater protection is requested. © 2016, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Gao B.,Nanjing Metro Group Co. | Wu T.,Nanjing Metro Group Co. | Peng H.,Nanjing Metro Group Co. | Li X.,Tongji University
Modern Tunnelling Technology | Year: 2014

By analyzing the segment erection process and the force applied on the segment, a finite-element method was adopted to study the variation law of the opening angles of longitudinal joints under different erection ovalities and different positions of the key segments. Additionally, the maximum internal and external openings at the sealing gasket were calculated for when the key segment is at the most unfavorable position. Research results indicate that: there is a linear relationship between the erection ovality and the segment opening angle, the position of the key segment affects the magnitude of the opening angle under the same erection ovality, the opening angle is at a maximum when the key segment is positioned at an angle of ±32.7276°, and the maximum opening at the sealing gasket is 5.1mm under the ovality of ±5‰D at this position. ©, 2014, Editorial Office of "Modern Tunnelling Technology". All right reserved.


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.


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.


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.


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.


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.


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

Aimed at the urgent problem of safety risk management of urban rail transit engineering, and based on theoretical analysis, this paper summarizes the experience gained by international cases combining traditional risk management with modern information technology. A synthetic, dynamic management-control model, guaranteed by safety risk management, technical standard, and real-time monitoring systems, is established, realizing a transformation from traditional accident handling to modern risk prevention. The practical application of the research results has verified this model's applicability, feasibility, and scientific validity.


Ting W.,Nanjing Metro Group Co.
Applied Mechanics and Materials | Year: 2014

when slurry shield drives in fine silty sand layer, the waste sand consists of a large amount of fine silty sand, it will wastes a lot of money if the waste sand is buried.In laboratory, we use the waste sand as the sand source of shield synchronized grouting, studying on the feasibility of the processing method and slurry properties. The results showed that the sieving waste sand in fine silty sand layer can be used as the sand source of shield synchronized grouting, it is a better way to increase the strength of slurry by increasing the ratio of fly ash for the slurry used the waste sand as sand source. © (2014) Trans Tech Publications, Switzerland.

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