Suzhou, China
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Yuan D.-J.,Beijing Jiaotong University | Wang F.,Suzhou Rail Transit Co. | Dong C.-W.,Suzhou Rail Transit Co. | Han B.,China Railway Construction Bridge Engineering Bureau Group Co. | Wang M.-S.,Beijing Jiaotong University
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2016

Based on the construction of shield cutting of 14 highway bridge piles with the diameters of Φ1 000~Φ1 200 continuously in Suzhou Subway, one new-style cutter for cutting large-diameter reinforced concrete piles directly was investigated by theoretical analysis, three-dimensional dynamic simulation and large field test of cutting piles. The results show that the cutter blade with zero back angle and negative front angle should be chosen and the new-style shell cutter is fit for cutting many large-diameter piles continuously. The new-style cutter breaks rebar with the mechanism of shear cutting and breaks concrete with the mechanism of squeezing damage. The steel is cut to form V-type groove by new-style shell cutter, the maximum stress of the cutter body is less than 1 500 MPa and the maximum temperature of the alloy blade is 291 ℃. The cutting concrete range of the shell cutter is the cross sectional region which the cutter body passes through. The effect of cutting concrete shows the characteristics of the jumping break and the ratio of tangential force to penetration force is about five to two. Whether cutting rebar or cutting concrete, the wear type of cemented carbide blade is abrasive wear. The wear coefficient of new-style shell cutter is about 0.77 mm·km-1. © 2016, Editorial Department of China Journal of Highway and Transport. All right reserved.


Wang F.,Beijing Jiaotong University | Yuan D.,Beijing Jiaotong University | Dong C.,Suzhou Rail Transit Co. | Han B.,China Railway 13th Bureau Group Co. | And 2 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2013

Based on the project for shield cutting of large-diameter bridge piles in Suzhou subway, the type selection, adaptability design and layout method for pile cutters were studied firstly from the theoretical perspective, and then the field test on shield cutting of Φ1200 diameter piles was carried out to analyze the damage law of cutter as well as its cutting performance. According to the test, the detail design of blade, cutter spacing and spatial layout of cutters were discussed and optimized, and furthermore the feasibility of cutting 7 piles continuously was evaluated. The results show that the shell cutter with double-side blade as well as zero back angle and negative front angle was recommended for cutting piles. The shell cutters broke concrete in the way of shear cutting and lateral crushing, and the steel rebar was cut by shear cutting with the coefficient of wear for cutter as 1.891 mm/km. The determination of cutter spacing and cutter width should cover the entire cutting plane of pile concrete. The wrapped and fixed conditions of rebar by surrounding concrete is a key factor of determining whether rebar could be cut off effectively, and consequently a spatial layout scheme of advancing shell cutter and the concept of cutting rebar in multiple times were presented. In addition, sharp corner should be avoided on the alloy blade, and cutting side piles may produce more damage on cutters compared to cutting central piles. The success of applying research results to engineering practice indicates that shield cutting of large-diameter piles continuously with adequate cutter configuration is feasible.


Xie M.,Soochow University of China | Zhang J.,Soochow University of China | Shi Y.,Suzhou Rail Transit Co.
Journal of Soochow University Engineering Science Edition | Year: 2012

In order to minimum headway of train ahead and train behind, Communication Based Train Control system should calculate the movement authority limit to update distance-to-go profile, which depends on bidirectional real time telecommunication between wayside and board. When a train became a Non-CBTC train, there will be mixture operation in same line. This condition is introduced.


Ju H.,Soochow University of China | Xiang W.,Soochow University of China | Lu Y.,Suzhou Rail Transit Company LTD | Du X.,Technology Co.
ICQR2MSE 2011 - Proceedings of 2011 International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering | Year: 2011

RAMS management has been successfully and widely applied in the railway industry abroad. But it is a new conception in the domestic rail transit industry. It is necessary to discuss the related issues of RAMS management in order to promote the standardization, the globalization of urban rail transit industry, and achieve safety, better performance as well as economic objectives of the project. This article outlines a new approach and model to reliability, availability, maintainability, and safety (RAMS) engineering and management based on EN50126 as well as national standard GB/T21562-2008. The new model covers all phases of the safety life cycle of urban rail transit and is aimed at the integrating management of proprietor, contractors, design institutes and supervision and so on. The article discussed main RAMS requirements to a safety rail transit project with high quality services. The RAM analysis methods and safety analysis and risk-matrix suitable for rail transit engineering are discussed in this article. A electromechanical system of rail transit project is used to illustrated the approach and model. RAMS management will play an important role in the development of urban rail transit in China. © 2011 IEEE.


Liu X.,Beijing Jiaotong University | Yuan D.,Beijing Jiaotong University | Qiao G.,Beijing Municipal Engineer Group Co. | Wang F.,Beijing Jiaotong University | Chen H.,Suzhou Rail Transit Co.
Modern Tunnelling Technology | Year: 2014

The Suzhou Metro Line 2 passes beneath 480 buildings in the old town of Suzhou. Since most of the buildings have no foundations or have simple strip foundations, they are inclined to crack or collapse due to deformation. Line 2 is constructed in silt and silty sand with a high water table and high water permeability, and potential drift sand or soil hardening can easily result in work-face failure because of soil disturbances caused by shield tunnelling. Although shield tunnelling technology has been developed along with the improvement of shield performance, it is still a new challenge to successfully tunnelling adjacent to a large number of buildings. Based on the driving speed, grouting material and grouting trials on-site, the scope of influence, control standards for surface settlement, driving speed, grout components and mix proportion, grouting volume and grouting time during shield tunnelling are given, which provides technical support for the safe shield tunnelling of the Suzhou Metro Line 2.


Li W.,Nanjing Southeast University | Tong L.,Nanjing Southeast University | Wang Z.,Suzhou Rail Transit Co. | Liu S.,Nanjing Southeast University
Jiefangjun Ligong Daxue Xuebao/Journal of PLA University of Science and Technology (Natural Science Edition) | Year: 2014

To analyze the change of the groundwater level and land subsidence outside the foundation pit caused by dewatering in different conditions, the integrated mean of "field pumping tests-the inversion of hydrogeological parameters-numerical simulation" was adopted. The 3-D finite element analysis model of the deep pit dewatering of one station of Suzhou Metro Line No.4 was established by using MIDAS/GTS to simulate and calculate the change of the groundwater level and land subsidence caused by different dewatering programs. The results show that the influence on the surrounding environment caused by different dewatering programs is inconsistent, which should be predicted and assessed to minimize the effect of the surrounding environment to achieve the optimal design of dewatering program.


Wang F.,Beijing Jiaotong University | Yuan D.J.,Beijing Jiaotong University | Cai R.,Suzhou Rail Transit Co. | Mu Y.J.,China Railway 13th Bureau Group Co. | Wang M.S.,Beijing Jiaotong University
Applied Mechanics and Materials | Year: 2013

Shield cutting obstacle pile directly has significant economic and social benefits compared to traditional methods, however, the corresponding cutting technology is far from mature currently in the international. Based on the construction need of cutting 14 bridge piles with the diameter of 1.0~1.2 meters by Suzhou subway shield, the preliminary scheme of cutter configuration was studied and proposed first, and then the world's first field test of shield cutting reinforced concrete piles was carried out, the effect and rule of shield cutters cutting piles were analyzed, and the cutter configuration scheme was verified and optimized. The test results indicate that the shell cutter is fit for cutting reinforced concrete pile, its cutting effect on rebar and concrete is shear cutting; In order to make rebar shorter, we should make the rebar be cut off instead of pulled off as possible as we can. The main damage form of shell cutter is alloy cracked. Cutting side pile produces more damage on shell cutter than cutting central pile. The shell cutter configuration scheme should not only satisfy the whole cutting ability and covering the entire cutting plane, but also to be favorable to fix rebar by surrounding concrete. © (2013) Trans Tech Publications, Switzerland.


Wang F.,Beijing Jiaotong University | Yuan D.,Beijing Jiaotong University | Dong C.,Suzhou Rail Transit Co. | Han B.,China Railway 13th Bureau Group Co. | And 2 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2013

Based on the construction need of shield cutting 14 large-diameter bridge piles in Suzhou subway, the field test of shield cutting two Φ1200 mm diameter piles was carried out;the effect and mechanism of cutting piles, characteristics of cutting parameters and damage law of cutting tools were analyzed. Then, the feasibility and key technology of cutting large-diameter piles were studied. The test results show that shell cutter can be fit for cutting pile directly; it breaks concrete by the way of shear cutting and laterally squeezing to fracture; and its working mechanism of cutting rebar is shear cutting. The wrapped condition of rebar by surrounding concrete is the key factor determining whether rebar could be cut off effectively. The thrust value and torque value which acting on the pile have an approximately linear relationship with penetration. The alloys of cutting tools are easily cracked because of great fluctuation amplitude of advancing speed. Cutting side pile produces more damage on cutting tools than cutting central pile. According to test results, the configuration scheme of advancing shell cutter and the concept of cutting rebar with different times were presented;the setting value of advancing speed was suggested against exceeding 2 mm/min, and the cutterhead should rotate with medium speed. The test results were successfully applied to the Suzhou cutting piles engineering;the test and engineering practice jointly indicate that shield cutting large-diameter piles directly is feasible.

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