Time filter

Source Type

Xie X.-Y.,Tongji University | Yu H.-J.,Tongji University | Wang Q.-G.,Shanghai Shentong Metro Group Co. | Wang C.,Shanghai Municipal Electric Power Company
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

The excavation-induced deformation of pipelines is one of the top environmental concerns for excavations in urban areas. The foundation pit at the exit to Yanggao Road Station Exit, which is part of the second stage project of Shanghai Metro line No. 9, overlies a Φ3000 mm-operating power tunnel. To prevent the possible tunnel damage due to the excessive deformation, the soils are strengthened by using the metro jet system (MJS) method, the blocks are constructed by means of the block excavation, and the FEM-based tunnel deformation prediction is adopted. In addition, a real-time tunnel deformation monitoring system consisting of static hydraulic pipes, crack meters and signal transmission equipments is also adopted. The monitoring data indicate that the soil treatment by the MJS method is an effective way for deformation control, and that the state of the tunnel can be captured by the tunnel deformation monitoring system in the very first time, which therefore enables the implementation of feed-back construction strategy.

Liu X.,Tongji University | Zhang L.,Tongji University | Li G.,Shanghai Tunnel Engineering Co. | Wu H.,Shanghai Tunnel Engineering Co. | Zhu Y.,Shanghai Shentong Metro Group Co.
Modern Tunnelling Technology | Year: 2014

Based on a full-scale test to verify the ultimate bearing capacity of a shield tunnel reinforced with a composite cavity, a non-linear additive model that can be used to simulate the structural reinforcement of the shield tunnel is presented, in which the composite cavity and segment are defined by various materials, and the bi-directional spring unit is adopted to simulate the bonding between a non-reinforced tunnel and the composite cavity. Additionally, the effectiveness of the model is verified by means of a comparison with the results of full-scale test. Furthermore, the values of some key parameters are described and the stress on the tunnel structure and failure mechanism are presented based on the simulated results, thereby providing a reference for the reinforcement optimization of operated shield tunnels. ©, 2014, Editorial Office of "Modern Tunnelling Technology". All right reserved.

Bi X.,Shanghai Shentong Metro Group Co. | Liu X.,Tongji University | Wang X.,Shanghai Shentong Metro Group Co. | Lu L.,Tongji University | Zhu Y.,Shanghai Tunnel Engineering Co.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2014

In order to develop an effective strengthening method to increase the load-carrying capacity of deformed segmental tunnel linings, full-scale tests are conducted on the linings strengthened by steel plates. The design of tested linings and the loading scheme are introduced. The bearing capacity and failure mechanism of the tested strengthened linings are discussed and analyzed. It is found that the bonded steel plate is effective and practical for strengthening the segmental tunnel linings. By this method, both the ultimate load-bearing capacity and overall stiffness of structures are increased. The behaviors under loading are similar to linings strengthened by full-ring and semi-ring steel plates. The failure modes of strengthened linings are both due to local bond failure between steel plates and segments.

Yan J.-Y.,Shanghai Shentong Metro Group Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

There will have been 13 lines with more than 500 km in length for the rail transit in Shanghai by 2012. At the same time, the urban development involves the construction of underground space that requires deep foundation pits. As a consequence, researches on the influences of deep foundation pits on the existing neighboring tunnels have become an important task. Based on the foundation pit of Wheelock Square, some protection measures which should be considered during the design and construction period for protecting metro tunnels are introduced. It may be valuable for the foundation pits more than 10 m in depth and less than 10 m in length near tunnels.

Ai Q.,Tongji University | Yuan Y.,Tongji University | Bi X.,Shanghai Shentong Metro Group Co.
Structure and Infrastructure Engineering | Year: 2015

Timely acquiring deformation of sectional profile is a proactive maintenance activity for ensuring the safety of tunnels. Metro tunnels, especially constructed by shield tunnelling method, are long span infrastructures need to inspect their deformations at many different positions. This is a vast amount of work if carried by traditional approaches manually. Some advanced technologies, such as terrestrial laser scanning, are also unable to carry out the work quickly and economically. However, only severe deformations that may lead to emergency action are required to be detected timely. Thus, the urgent demands for acquiring sectional profile of metro tunnel should be of fast in operation, accuracy under tolerable acceptance and competitive with cost efficient. This paper focuses on the method of acquiring sectional profile of metro tunnels by a cart equipped with charge-coupled device cameras. The geometric features of sectional profile are extracted from images by a series of algorithms based on photogrammetry. Using this method, the speed of acquisition is improved no less than 5 km/h with acceptable accuracy. An on-site application validates that this method is sufficient for screening out severe deformations in metro tunnel. © 2015 Taylor & Francis

Liu F.,Henan University of Science and Technology | Zhu H.,Tongji University | Yu N.,Shanghai Shentong Metro Group Co.
Advanced Materials Research | Year: 2011

Based on the literatures and the existent researches, the study on segment joint of prestressed concrete lining has been carried out. The analytical solution for calculating the rotational angle of the joint are deduced with the calculation assumption. So the rotating stiffness of joint is obtained. Compared with the experimental results, the numerical calculation suggests that the theoretical equations are reliable. Study shows the slip length of prestressing steel strand near the joint is one key to calculate the rotational angle and rotating stiffness of joint. The matched curve of the slip length with joint bending moment is given in the paper, which can be described by logarithmic function. When the rotational angle of the joint is calculated, the slip length could be regarded as a constant to simplify the calculation. © (2011) Trans Tech Publications.

Liang J.R.,Shanghai University of Engineering Science | Wang Y.M.,Shanghai University of Engineering Science | Chen W.J.,Shanghai University of Engineering Science | Shi C.,Shanghai Shentong Metro Group Co. | lu X.Y.,Shanghai Shentong Metro Group Co.
Applied Mechanics and Materials | Year: 2013

This paper introduces the signal data acquisition method of the FSK signal using NI equipment in the track circuit system, and the FSK signal modulation demodulation based on LabVIEW. The track circuit communication detection device for Shanghai metro line 2 provided effective means, saved maintenance costs, created the economic benefit and laid the foundation for subsequent signal detection. solved the problem that without special equipment detection in wayside, it can also realize the results of detection intuitively and the quantitative analysis of technical index. © (2013) Trans Tech Publications, Switzerland.

Bi X.,Shanghai Shentong Metro Group Co. | Liu X.,Tongji University | Wang X.,Shanghai Shentong Metro Group Co. | Lu L.,Tongji University | Yang Z.,Shanghai Shentong Metro Group Co.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2014

Full-scale static loading tests were conducted on the ultimate bearing capacity of continuous-jointed segmental tunnel linings. The design of testing linings and loading schemes were firstly introduced. The test results, including the evolution of deformation, segment crack, joint opening and connecting bolt stress, were achieved. The bearing capacity and failure mechanism of tested linings were discussed and analyzed. It was found that the failure of tested linings was caused by the strength failure of its joints, implying that the joints should be taken with great cares during the structural design. Compared with the overload case, the unloading case is often more detrimental to the bearing capacity of tunnel linings.

Fan Y.H.,Tongji University | Fan Y.H.,Shanghai Shentong Metro Group Corporation Ltd | Zhang J.,Tongji University | Zhang J.,Shanghai Shentong Metro Group Corporation Ltd | And 2 more authors.
2015 12th International Computer Conference on Wavelet Active Media Technology and Information Processing, ICCWAMTIP 2015 | Year: 2015

The working status information of key equipments serving at operation and control system is of great value for safe and productive operation in urban rail transit. Properly utilizing and tracking the working status from operation record data, is for sure meaningful in evaluating the working status of those key equipments, and can thus acquire the stage status in their life cycles. In this paper, based on a exhaustive study of the annual operation record data including number of failure, mean time between failures (MTBF) and mean time to repair (MTTR) of track circuits which is serving as a kind of key equipment in Shanghai Metro Line 2, a quarterly comprehensive evaluation method has been proposed. By employing the proposed method, the working status of track circuit in Shanghai Metro Line 2 has been studied in detail, moreover, the stage in its life cycle from data has also been discussed. © 2015 IEEE.

Zhang J.,Tongji University | Zhang J.,Shanghai Shentong Metro Group Corporation Ltd | Fan Y.-H.,Tongji University | Fan Y.-H.,Shanghai Shentong Metro Group Corporation Ltd | And 2 more authors.
2015 12th International Computer Conference on Wavelet Active Media Technology and Information Processing, ICCWAMTIP 2015 | Year: 2015

Urban rail transits in major cities in China are now forming complex networks due to the rapid development of themselves. Travel speed of urban rail transit network, which is an important index reflecting the service quality, has attracted much attention by those operation companies. Higher travel speed can surely lead to higher inventory turnover and less usage of trains. Till now, most related research have been only focused on the energy consumption oriented travel speed control or optimization. In this paper, based on a most representative case-Shanghai urban rail transit network which has more than 10 lines in it, the impact factors of travel speed has been comprehensively analyzed, including the performance of signal system and operation organization of all the lines; moreover, their countermeasures has also been proposed in detail. © 2015 IEEE.

Loading Shanghai Shentong Metro Group Co. collaborators
Loading Shanghai Shentong Metro Group Co. collaborators