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Zhu X.-J.,Shanghai Shenyuan Geotechnical Engineering Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

The deformation caused by support dismantling may affect the security and stability of deep foundation pits and surroundings in soft ground. Based on the design and construction practices of a large number of deep foundation pits in soft soils, the treatment measures for controlling the deformation caused by support dismantling are introduced through support replacement. Multiple support replacement methods under special conditions and their characteristics, main design issues and application conditions are discussed. It will provide some reference to the design and construction of similar projects.


Tang J.,Shanghai Shenyuan Geotechnical Engineering Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

For a super-deep excavation in Shanghai, the application of late-dismantling support in the design of retaining structures is introduced. The difficulties of the design and construction are analyzed, and the relevant solutions are given. A comparison among numerical simulations, theoretical results and engineering data shows that the results are close, and the monitoring data do not exceed the warning values. The influences of pit excavation on the surrounding environment can meet the requirements of specification. The design method is successfully used in this project and achieves satisfactory effects. It will provide some reference for the design and construction of similar projects.


He C.,Shanghai Shenyuan Geotechnical Engineering Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

The calculation of heave of soldier piles resulted from the excavation of foundation pits is unavailable at present. The characteristics of force and displacement of soldier piles are analyzed. The relationship between the length of soldier piles and the depth of pit rebound is discussed. The depth of pit rebound in soft soils is defined. The Mindlin surface integration is employed to derive the method to calculate the pit rebound. According to the interaction between piles and surrounding soils, the method to calculate the heave of soldier piles is obtained. The relevant program is compiled. Based on deep excavation cases of metro and high-rise building on the inverse construction, the present method is evaluated and compared with measured data. The difference between calculations and measurements is discussed.


Liu Z.,Shanghai Shenyuan Geotechnical Engineering Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

The rebuilding and extension of the heritage buildings include two important sides. One is the foundation improvement of the old buildings, the other is the construction of new buildings. The problem of the former is that the original structures cannot be damaged during construction, and that of the latter is the difficulty in minimizing the influences on the old buildings during the deep excavation construction. Based on the successful case of Yifeng Building, the detail of how to reinforce the foundation of the old buildings, and how to design the construction of deep excavation of the new building under restriction of every aspect is introduced. This project is located at the Bund and is adjacent to several heritage buildings. Composite anchor jacked piles are applied to the rebuilding of the old buildings, and the top-down construction method is applied to the deep excavation of the new ones. It is shown that these techniques result in successful rebuilding of heritage buildings and surroundings. The successful application supplies some reference to similar projects in future.


Gao G.-Y.,Tongji University | Zhang B.,Tongji University | Li W.,Shanghai Shenyuan Geotechnical Engineering Co.
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

In order to study the three-dimensional (3D) isolation vibration effectiveness of wave impeding block (WIB) in layered and vertical heterogeneous foundation under horizontal-rocking coupled excitation, a 3D semi-analytical boundary element method (BEM) model based on thin-layered method (TLM) efficiently to study the wave propagation in layered ground and BEM precisely to solve infinite domain problems is presented. The analysis is accomplished with this model, on which the Green's function is regarded as fundamental solution of a stratified half-space. Then the active isolation effectiveness of WIB is studied in layered and vertical heterogeneous foundation. The results show that the stratification parameter and the heterogeneity have significant influence on the vibration isolation effect of WIB, and the isolation vibration effectiveness of the upper stiff-layer and lower soft-layer ground is better than it of the upper soft-layer and lower stiff-layer ground.

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