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Tan Y.,Tongji University | Wei B.,China Railway Eryuan Engineering Group Co.
Journal of Geotechnical and Geoenvironmental Engineering | Year: 2011

A 16-18 m deep excavation for a metro station with in-plane dimensions of approximately 20 m wide by 290 m long was constructed by using the cut-and-cover technique in soft clay in the Shanghai metropolitan area, in which many high-rise buildings and utilities exist. To investigate the performance of this deep excavation and the associated effect on the adjacent buildings and utility pipelines, a long-term comprehensive instrumentation program was conducted during construction. Field observations included deflections of diaphragm walls, vertical movements at wall tops, ground settlements, and settlements of surrounding buildings and utilities. Analyses of field data indicated that overexcavation (i.e., removing more soil than designed) and a long construction duration caused the diaphragm walls to develop substantial deflections. The base and middle floor slabs played dominant roles in suppressing postexcavation wall deflections and ground settlements. This excavation in general exhibited different behaviors than other excavation projects because of its relatively long shape. Behaviors of deep excavations in Shanghai soft clay are affected not only by construction duration (i.e., time effects), but also by their geometries (i.e., space effects). This project serves as a special case study and provides insights into the design and construction of a long and deep excavation that uses the cut-and-cover technique in soft soils and in a metropolitan environment. © 2012 American Society of Civil Engineers.

Song N.,China Railway Eryuan Engineering Group Co.
Modern Tunnelling Technology | Year: 2013

Using the Shenzhen Metro line 2 passing underneath the Shawan River Bridge as an example, the key techniques for the design and construction of the underpinning of the existing pile foundation in the tunnel are presented, and the rationality of this construction method is verified by theoretical analysis, numerical calculations, and site monitoring. The study results show that the underpinning of an existing pile foundation in a tunnel could minimize the impacts of removing an existing bridge on ground traffic. The key points of this method include preparation of the underpinning principle, determining the underpinning structure and layout, using reasonable procedures for tunnel excavation and pile foundation underpinning, and keeping the settlement and deformation of existing buildings within an allowable range.

Yuan Y.,China Railway Eryuan Engineering Group Co.
Modern Tunnelling Technology | Year: 2013

Based on the characteristcs of red bed passed by the Longquanshan No.1 and No.2 tunnels on the Chengdu-Jianyang expressway, the grading of tunnels with gas present was analyzed. This paper presents the treatment measures adopted in this situation based on the designs of the two tunnels discussed.

Guo J.,China Railway Eryuan Engineering Group Co.
Modern Tunnelling Technology | Year: 2013

Based on one tunnel of the Kunming metro that runs through a peat soil stratum, a study was made concerning the stratum distribution around the tunnel and the internal force distribution law of the segment lining of the shield tunnel. The disturbance condition in the peat soil stratum was simulated by changing the stratum resistance coefficient under the most unfavorable load condition to thoroughly simulate the structural behavior of the segment lining. The law of internal force of the lining structure varying with the disturbance magnitude in a peat soil stratum was obtained.

Xu X.-D.,China Railway Eryuan Engineering Group Co.
Journal of Railway Engineering Society | Year: 2014

Research purposes: The demand for the special design of railway bridge piers is increasing. And the commercial software of railway bridge pier design does not exist by far. In order to help design personnel free from a mass of tedious drawing and calculation work, study on the parametric design platform system of the railway bridge pier which can do drawing and calculation work is carried out. In this paper, with the modular design, based on the VC7.0 platform with c++ language and Object ARX managed wrapper class, the design platform system of railway bridge pier based on AutoCAD secondary development is developed Research conclusions: (1) This software system has realized automatic output the design drawing of pier structural, pier cap, pier shaft, pier cap reinforcement and foundation. (2) This software system realized railway bridge pier's parametric design. So this software system can effectively improve design efficiency and reduce man-made error in the design and improve the work efficiency. (3) Taking the side pier design in the continuous girder bridge as the example, it is verified with regards to the reliability of the software. The results show that the parametric platform system is reliable.

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