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Tan Y.,Tongji University | Wei B.,China Railway Er yuan 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.


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.


Ni A.,China Railway Eryuan Engineering Group Co.
Modern Tunnelling Technology | Year: 2014

Taking the construction of Kunming metro line 3 as an example, this paper simulates the influence of shield tunnelling in cumulosol strata on adjacent bridges with FEM software, analyzes the law of ground settlement and bridge pile foundation displacement, and compares the simulated data with the measured data. The results showed that: shield tunnelling in cumulosol strata may cause great ground settlement and pile foundation displacement, while a certain range of reinforcement can effectively reduce them; the simulated ground settlement and bridge displacement after ground reinforcement are close to the site measured results, validating its accuracy and feasibility.


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.


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.


Peng C.,China Railway Eryuan Engineering Group Co.
Modern Tunnelling Technology | Year: 2013

During the construction of the Longquanshan No.l tunnel on the Chengdu-Jianyang expressway, a fractured rock mass and abundant underground water at the tunnel portal, as well as spalling of shotcrete, distortion of the steel frame, crown settlement, and surface cracking, were encountered, which seriously affected the quality of the tunnel structure and operation safety. In the design addressed in this paper, such measures as micro-bench method, increased reserved deformation, a large arch spring, grouting reinforcement, and dismantling of the original support were adopted and good results were obtained.


Qiang X.-G.,China Railway Eryuan Engineering Group Co.
Journal of Railway Engineering Society | Year: 2013

Research purposes: When digging to earth-rock interface of the right cutting surface, multiple retrogressive tensile fractures appeared to the right ground of the cutting of the end area of the Taigong Station and the varying degrees of slide also appeared to the right slope to form the engineering landslide. Through analyzing the reasons for the engineering slope of the Taigong Station of the Lanzhou-Chongqing Railway, this paper puts foreward the treatment measures and ideas on how to strengthen the survey of high slope and deep cutting area and summarize the survey and test methods of providing the reference to the similar projects. Research conclusions: (1) When the cutting soil layer is rather thick, the retaining engineering should be done first in the construction process and the monitoring of the slope on the both sides should be strengthened. (2) In the thick red soil layer area, the necessary retaining measures should be taken to the soil cutting or half soil and half rocky cutting with abundant groundwater. (3) When the parent rocks is possible to produce the dilatability argillaceous rock in the thick soil area, three indexes of the expansive soil should be distinguished to determines the soil nature for providing the reliable basis for the design and construction. (4) For high slope and deep cutting surveys, the exploration points should be rationally arranged according to concrete topographical conditions and the control sections should be properly arranged. In addition, the transverse width of the survey should be increased. (5) The result can be widely applied in the survey and construction of high slope and deep road bed of railway and highway.


Li J.,China Railway Eryuan Engineering Group Co.
Journal of Railway Engineering Society | Year: 2013

Research purposes: With construction of high-speed railway in large scale, the tunnel length and tunnel amount increase rapidly. For the geological exploration, especially for the geophysical exploration for the tunnel, there are lots of works to be done with the big technical difficulties, many ways and high cost. The research was done on the geophysical exploration pattern for the railway tunnel on consideration of the cost of the geophysical exploration for the purpose of achieving the good exploration accuracy. Research conclusions: (1) During the exploration and design stages, the CSAMT method is mainly used for exploring the 40 m deep ground, the corresponding geophysical exploration methods should be used for exploring the ground of the less than 40 m depth, and the multiple coverage seismic reflection wave method should be used for the geological exploration for the subaqueous (submarine) tunnel. (2) During the construction stage, the electric sounding method is used for exploring the tunnel base, the hole-crossing elastic tomography method is used for exploring the area with density distribution of coal goafs, the EM tomography method is used for exploring the karst area, especially for the karst with good development, the TPS method is used for the advanced geological forecast to the area in front of the working face of the tunnel, and the ground penetration radar is used for inspection of the lining quality of the tunnel.


Gou B.,China Railway Eryuan Engineering Group Co.
Journal of Railway Engineering Society | Year: 2013

Research purposes: Shenzhen Chegongmiao integrated transport hub is the passenger integrated transport hub which set 4 rail transportation, conventional public transportation, rental and social vehicles as a whole. The hub has many urban rail transit lines, large scale, complex passenger flow organization, many surrounding environment control factors, the project is difficult to implement. In this paper, through the analysis of Chegongmiao hub from the initial planning to study layout line, the writer proposed some methods and ideas about how to do research on line layout of large orbit traffic hub, so as to provide reference for similar engineering. Research conclusions: Research of large hub of rail transit is a process that involves many fields, many control factors, engineering complex, also is a macro to micro process. For large rail transport hub should increase research investment in the early planning, to determine the feasibility of its function and its implementation as soon as possible, the later location adjustment is likely to cause the corresponding transformation project, increase the project implementation difficulty and investment, and make the defect on function of use. At the same time, line layout of large hub inner orbit traffic are complex, the spatial relationship between the hub and line and before and after the interval should be dealed with for meeting the needs of the passengers at maximum limit, analysis and study for a variety of possible layout should be carried out, strive to be comprehensive, in order to get the most reasonable layout scheme.

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