Ningbo urban rail transit project construction headquarters

Ningbo, China

Ningbo urban rail transit project construction headquarters

Ningbo, China
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Ye J.-N.,Ningbo Urban Rail Transit Project Construction Headquarters | Liu G.-B.,Ningbo University
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

In the design of underground structure, the action of the side friction is rarely considered and the determination method of the side friction is also not given in the design specification. Therefore, there is no unified regulations on anti-floating safety coefficient which can be ascertained according to the similar engineering practice. In this paper, the structure of the stations in Ningbo urban rail transit project is investigated by using the available experience and the uplift test results. The side friction of the structure is calculated; then the critical width of the station structure is ascertained when the anti-floating safety is considered. The results can provide a little of instruction on the design of metro station.


Zhu J.F.,Ningbo University | Liu G.B.,Ningbo University | Ye J.N.,Ningbo Urban Rail Transit Project Construction Headquarters
Applied Mechanics and Materials | Year: 2014

According to the first-stage geologic investigation reports of the line 1 and line 2 in Ningbo rail transit, the natural density (ρ) and the vane strength (Cu) probability distribution of the typical layers in Ningbo area were studied in this paper. Besides, the reliabilities of the typical layers foundation bearing capacity in Ningbo area were evaluated by the checking point method. It is found that (1) the natural densities of the typical layers in Ningbo area show good normal distribution as their corresponding variation coefficients (δ) are small. Unfortunately, the vane strengths of the typical soils in Ningbo area show poor normal distribution as their corresponding variation coefficients (δ) are large. (2) The soil parameters variation has significant influence on the reliability index β. Moreover, β is more sensitive to the variation of ρ than to the variation of Cu. (3) As the safety coefficient methods can not consider the influence of the soil parameters variation on the foundation stability, it is suggested that the foundation stability in Ningbo area should be evaluated by the reliability analysis method. © (2014) Trans Tech Publications, Switzerland.


Chen B.,Ningbo urban rail transit project construction headquarters | Ye J.,Ningbo urban rail transit project construction headquarters
Applied Mechanics and Materials | Year: 2013

Considering the feature of soil layers and surrounding architectures in line 1 of Ningbo metro, finite element method is used to analyze the impact of displacement of existing shield-tunnel, which comes from the building load on the shallow foundations closed to the metro tunnel. Then, the effect feature of upper load of shallow foundation on metro tunnel is got. It is shown that both the horizontal displacement and the vertical displacement of shallow foundations decrease with increase of the horizontal projection distance between loading position and tunnel, and the reducing magnitude of the vertical displacement is significantly larger than that of the horizontal displacement. Accordingly, it is proposed that both the horizontal displacement and the vertical displacement should be controlled within 10mm when the loading width is approximately 10m, and it can be regarded as the controlling distance of the building load of metro tunnel. © (2013) Trans Tech Publications, Switzerland.


Ye J.-N.,Ningbo Urban Rail Transit Project Construction Headquarters | Chen B.,Ningbo Urban Rail Transit Project Construction Headquarters
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

The GDS single vibration triaxial test is carried out on the marine deposit soft clay in line 1 of Ningbo urban rail transit, and the dynamic strength and pore pressure property of the soft clay in condition of different dynamic stress amplitudes and frequencies are analyzed. It is shown that the shear strength in isotropic consolidation is greater than that of K0 consolidation in case of similar dynamic stress. The shear strength increases with increasing frequency in the same dynamic amplitude. Furthermore, the greater dynamic stress is used in the test, the higher shear strength of samples is obtained; and a hardening phenomenon occurs. With increasing of vibration times, pore pressure increases, except that there occurs a stable tendency in layer (3) when the stress amplitude is 5kPa. At last, the data of the dynamic triaxial test is fitted; and the parameters are used to model the accumulative pore pressure.


Zhu X.-R.,Zhejiang University | Wang S.-Z.,Zhejiang University | Ye J.-N.,Ningbo Urban Rail Transit Project Construction Headquarters | Wang W.-J.,Zhejiang University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

By analyzing the data of O-cell pile testing, new load transfer models before and after post grouting are proposed. The precise conversion method used to load-settlement curve transformation under the O-cell pile testing method is improved, and the influence of continuity of soil on the settlement is considered. The rationality of the proposed models is shown by the practical engineering. Further analysis shows that the the influence of continuity of soil on the settlement of super-long piles is strong, the ultimate bearing capacity with considering the continuity of soil is less than that without, and the improved method is safer.


Xu P.,Zhengzhou University | Tie Y.,Zhengzhou University | Chen B.,Ningbo Urban Rail Transit Project Construction Headquarters
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2015

The lengths of cylindrical cavities were considered as much larger than their diameters, so the isolation of incident plane P1 waves (fast compressive wave) by discontinuous barriers composed of several rows of cylindrical cavities was simplified as a two-dimensional plane problem. The conformal mapping method of complex functions and expansion method of wave functions were adopted, the cylindrical cavities were considered to be of free boundaries, where no stresses exist, and then the theoretical solutions about the complex coefficients of scattering wave potential functions were obtained. By studying the normalized displacement amplitudes, which are expressed as the ratios of displacement amplitudes of soils behind the barriers caused by both the incident and scattering waves to those only by the incident P1 waves, the isolation effects of the barriers composed of one, two and three rows of cylindrical cavities were compared. The results reveal that the isolation effects of barriers composed of several waterproof cylindrical cavities are better than those composed of permeable cylindrical cavities; the isolation effects of barriers composed of several rows of cylindrical cavities on incident P1 waves with higher frequencies are much better than on those with lower frequencies; with the increasing of row number of cylindrical cavities, the vibration isolation effects is obviously improved, and the effective isolation area is obviously increased; as the row number of cylindrical cavities reaches three, the isolation effects at some locations behind the barriers are much better and almost increase to 70%. ©, 2015, Chinese Vibration Engineering Society. All right reserved.


Junneng Y.,Ningbo Urban Rail Transit Project Construction Headquarters
15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability | Year: 2015

Ningbo is located in the southeast coast plain. There are thick, soft soil deposits lying in the sub-ground, which challenges the construction of urban rail transit in this area. A project of Ningbo Rail Transit Line 1 and the soil conditions for the construction site are firstly presented. Then, the excavation engineering designs for the project are summarized from four aspects: the design of building envelope, vertical and horizontal layout of supporting system, underground water dewatering and ground treatment. Simultaneously, the problems occurred in the design are also described. Lastly, the experiences gained from the project are summed up, so as to guide the further subway construction in the area and also provide a reference for the construction of similar project.


Ye J.-N.,Ningbo Urban Rail Transit Project Construction Headquarters
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

Based on Biot's dynamic poroelastic theory, a system of rail pad, sleeper, ballast and double layers of transversely isotropic saturated subgrade is proposed, in which the system can be decomposed as a track system and a double layered soil system. Applying the double Fourier transformation technique to the track system and the soil layer system, the governing equation of track-layered transversely isotropic saturated subgrade system is simplified as an eigenvalue problem for solving a 6 order governing equation. The solutions of the dynamic response of track system-double layered transversely isotropic saturated subgrade to train loads are derived in the transformation domain. Numerical results are obtained by using the inverse fast Fourier transform(IFFT); and then the IFFT are used to analyze the influence of the modulus and Poisson ratio of the first and the second layer of soil on the displacement, pore pressure and shear stress. It is shown that there are great influence of the stiffness of soil layers on the dynamic response; and the influence of modulus are greater than that of Poisson ratio. The computational results can serve as a reference for determination of the reinforcement depth in the soft subgrade.


Ye J.,Ningbo Urban Rail Transit Project Construction Headquarters | Chen B.,Ningbo Urban Rail Transit Project Construction Headquarters
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2011

In recent years, the centrifuge model test has become one of the powerful experimental tools fpr geotechnical engineering. In centrifuge test, geotechnical processes are simulated using small scale models subjected to the acceleration n times the earth's gravity. As the deflection similarity coefficient of the diaphragm wall for the centrifuge model is 1/n the prototype model, so the anti-floating property of the metro station constructed with diaphragm wall can be simulated easily. In this paper, the floating forces and anti-floating property of the metro station of Ningbo urban rail transit project are studied for different depth of overlaying soil, buried ratio of supporting structure and water content of soil using the centrifuge model tests. Based on the results of the model test, some conclusions are drawn and can be used as the guidance to estimate the floating forces and anti-floating property in Ningbo soft clay.


Ye J.,Ningbo Urban Rail Transit Project Construction Headquarters
Geotechnical Special Publication | Year: 2010

Due to the complicated construction condition, i.e. formidable natural conditions and complicated geological conditions and the large scale of bay bridges, the design and construction of Hangzhou bay bridge have inevitably encountered numerous obstacles, among which the construction of large scale pile foundation is a crucial one. In this paper, the key technology and countermeasures of construction of large scale pile foundation in rich shallow-buried gas in offshore zone of the south shore beach area are introduced. Deformation of the steel casing pipe and countermeasures project was studied in the pile construction of south and north channels bridge piers. In addition, such technologies as installation of cathode protection, large-sized pile-sinking barge performance and pile-sinking hammer model, are studied in steel-pipe pile foundation construction of water area. The results will serve as a theoretical foundation and guidance for successful construction, operation safety and sufficient durability of Hangzhou bay bridge, and also as a reference for design and construction of other bay bridges in China. © 2010 ASCE.

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