China Railway Eryuan Engineering Group Coltd
China Railway Eryuan Engineering Group Coltd
Dai F.,China Railway Eryuan Engineering Group Coltd |
Zhu Y.,China Railway Eryuan Engineering Group Coltd |
Zhu Y.,Southwest Jiaotong University |
Liu X.,Southwest Jiaotong University
2017 Joint Rail Conference, JRC 2017 | Year: 2017
According to the structural characteristics of the double-block track, using the Green's function and superposition principle, the analytical model of the vertical vibration of the double-block track in frequency domain was established to analyze the responses of the double-block track in frequency domain and the influences of fastener stiffness, bedplate thickness and subgrade supporting stiffness on it. The results show that there are three obvious peaks for the rail mobility which are caused by bedplate resonance (35 Hz), rail resonance (200 Hz) and pinned-pinned resonance (1 kHz). Within the frequency range of less than 35 Hz, the bedplate mobility is determined by the bedplate supporting stiffness. Also the bedplate vibration decay rate increases with the increasing frequency. The bedplate resonance and wheel-rail coupling resonance have the most significant effect on the bedplate displacement. The frequency range where the rail high vibration decay rate lies gets wider with the larger fastener stiffness. Increasing the bedplate mass cannot attenuate its vibration in the mid-high frequency range. © Copyright 2017 ASME.
Xu J.,China Railway Eryuan Engineering Group Coltd |
Xu J.,Southwest Jiaotong University |
Luo Q.,China Railway Eryuan Engineering Group Coltd |
Mao J.-C.,China Railway Eryuan Engineering Group Coltd |
And 2 more authors.
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2012
To achieve cooperative control of curve radius R, deflection angle ΔA and roadway width WDL in design phase by using operating speed profiles, 14 typical operating models were transformed and discretized into great deal of data points of lateral acceleration versus R. The concept of equivalent radius Re was proposed which was the actual radius of vehicle track on the middle curve. Then, the observation data of Re was investigated on several highways, and the regression formula for modeling the effect of ΔA and WDL on operating speed was obtained. Moreover, the effect of traffic volume on driving speed was analyzed on horizontal curves with different radii, the difference between operating speed and average speed, ΔV, was calculated, and the regression models of ΔV, R and the volume of traffic were developed. Speed simulation results on three highways indicate that the operating speed profiles calculated from the models presented in this paper can reflect the influence of R, ΔA and WDL. Therefore, practitioners can simultaneously modify ΔA and WDL as well as R in highway design. Furthermore, travel time of different traffic volumes can be determined according to operating speed, so the standard of service of the designed highway can be predicted.
Li Z.,Southwest Jiaotong University |
Cao S.,China Railway Eryuan Engineering Group Coltd |
Su W.,Eastern Alliance Construction Engineering CO.LTD
Applied Mechanics and Materials | Year: 2013
On the basis of the traffic cost model and the land value function model, this paper analyzes and reveals the interaction of the urban rail transit construction and the surrounding land price. It also illustrates the feasibility and the necessity of the comprehensive development of adjacent land of urban rail transit. © (2013) Trans Tech Publications, Switzerland.
Niu H.,Hunan University |
Zhou S.,China Railway Eryuan Engineering Group Coltd |
Chen Z.,Hunan University |
Hua X.,Hunan University
Wind and Structures, An International Journal | Year: 2015
Aerodynamic forces of vortex-induced vibration and galloping are going to be coupled when their onset velocities are close to each other, which will induce the cross-wind amplitudes of the structures increased continuouslywith ever-increasing wind velocities. The main purpose of the present work is going to propose an empirical formula to predict the response amplitude of VIV-galloping interaction. Firstly, two typical mathematical models for the coupled oscillations, i.e.,Tamura & Shimada model and Parkinson & Corless model are comparatively summarized. Then, the key parameter affecting response amplitude is determined through comparative numerical simulations with Tamura & Shimada model. For rectangular cylinderswith the side ratio from 0.5 to 2.5, which are actually prone to develop the VIV and galloping induced interaction responses, an empirical amplitude prediction formula is proposed afterregression analysis on comprehensively collected experimental data with the predetermined key parameter. Copyright © 2015 Techno-Press, Ltd.
Zhang X.,Tongji University |
Wu H.,Shanghai Tunnel Engineering Co.Ltd. |
Li Q.,China Railway Eryuan Engineering Group Coltd |
Bai Y.,Tongji University
ITA-AITES World Tunnel Congress 2016, WTC 2016 | Year: 2016
Construction activities account for a large share of the global Greenhouse Gas emission. In the past 10 years, project decision-makers and researchers have been paying more attention to the carbon emission of tunnel projects. In this paper we study the carbon emission calculation in shield tunneling. The objective of this paper is to: (1) analyze the complex variables which affect the total emission of shield tunneling; (2) develop and illustrate a new data-mining-based method to estimate the carbon emission in the construction phase; (3) assess the emission prediction reliability of a data-mining-based method-the Randomforst model, with R programming language. This study is based on a large-diameter shield tunnel built in Shanghai, China, and shows that a reliable predictive performance can be achieved with this new data-mining-based method.
Li H.,Chengdu University of Technology |
Mao L.,China Railway Eryuan Engineering Group Coltd
Applied Mechanics and Materials | Year: 2014
The practice of BIM technology in the entire life cycle of East railway station building. BIM technology has many advantages in the visualization, coordination and simulation relative to the traditional two-dimensional design. The paper summarizes the use of BIM technology in the design phase of railway station, and point out the use directions of BIM technology in the next stages of construction and operation. © (2014) Trans Tech Publications, Switzerland.
Ding Z.-F.,China Railway Eryuan Engineering Group Coltd |
Wu P.-P.,China Railway Eryuan Engineering Group Coltd |
Liu H.-J.,China Railway Eryuan Engineering Group Coltd |
Li N.,China Railway Eryuan Engineering Group Coltd
Journal of Railway Engineering Society | Year: 2016
Research purposes: Coulomb active earth pressure is widely applied in construction engineering. Engineers generally use the formulas of manual or code.But these formulas have limitations which are only applied to specific boundary conditions.And in the process of practical engineering design, boundary conditions often break through these specific boundary conditions.At this point, those formulas from manuals or codes are not applicable,and this often brings troubles to the designers.So it is necessary to find a common solution for Coulomb active earth pressure,which can be applied to all kinds of boundary conditions.This paper presented the common solution based on the principle of Coulomb earth pressure and differential principle,which can be used to provide convenience and reference for designers. Research conclusions:(1)This paper presented a general solution for various boundary conditions based on the principle of Coulomb earth pressure and differential principle.(2)Although this method is more complicated, but it is very easy to implement by using computer programming.The calculation process is convenient and quick. (3)In practical engineering design, especially when the boundary condition is more complicated, using the software based on the general solution of this paper to calculate the Coulomb active earth pressure can have twice the result with half the effort. © 2016, Editorial Department of Journal of Railway Engineering Society. All right reserved.
Yue Z.Q.,China Railway Eryuan Engineering Group Coltd
Applied Mechanics and Materials | Year: 2014
Guizhou section of Chengdu-Guiyang Railway is located in northwestern GuizhouPlateau, which belongs to Chishui River and Wujiang Drainage Area. Thegeologic structures are mainly the fold or fracture in the direction of North-North East, and have Flat rock. Carbonate rocks are widely distributed on the surface of this area. All kinds of karst pronounced,and water and soil conservation is very bad. Rocky desertification is serious, and environmental is sensitive. Karst is one of the main unfavorable geology of control line scheme. In this paper, from the regional geological environment and regional hydrological environment,analysis of the factors influencing karst has been done. The development regularities of karstis summarized, and the corresponding classification standards are provided. Through the comprehensive analysis of each line program of geological factors,karst geological basis for the route plan is provided. © (2014) Trans Tech Publications, Switzerland.
Chen L.,Chongqing Jiaotong University |
Liang B.,Chongqing Jiaotong University |
Wang Z.,China Railway Eryuan Engineering Group Coltd
Advanced Materials Research | Year: 2011
The intersection of the transverse traffic tube and main tunnel is the weak link in the tunnel, as its structural forms are changed greatly and stiffness is discontinuous, so it does not help resist the seismic action. Based on the soil-structure interaction model and the use of visco-elastic boundary conditions and of time history analysis method, this paper, in combination with the Menglian tunnel engineering on the Bao-Teng Highway in Yunnan, has made a research of seismic dynamic response in the aforesaid intersection by analyzing its seismic dynamic characteristics and stability upon acquiring its displacement, stress, acceleration of dynamic response and distribution characteristics, and then put forth some disposal measures by seismic reinforcement, which can serve as reference to seism-reducing design of the weak link in the tunnel as well as other similar projects in a highly seismic region. © (2011) Trans Tech Publications, Switzerland.
Wang M.-J.,China Railway Eryuan Engineering Group Coltd |
Zhao P.,China Railway Eryuan Engineering Group Coltd
Journal of Railway Engineering Society | Year: 2015
Research purposes: Sebeta~Mieso section of the new Ethiopian railway is located in the Great Rift Valley, passing partly through the slope toe plains of Fantale dormant volcano, where a lot of small explosive volcanic cones are distributed and several developed ground fissures cross under the railway, the volcanic cavities concealed in the underground will endanger the safety of the railway works. Through the comprehensive ways of regional geological information collecting, geological investigation, geophysical prospecting and mechanical drilling in fieldwork, the distribution law of the volcanic cavities is found out to correctly evaluate the influence of cavities on the railway engineering, which is good for taking corresponding treatment measures to ensure the safety of the engineering. Research conclusions:(1) Fantale volcano and plains region at the slope toe are the active district of the crustal plate and the quaternary volcano aggravating activity district. (2) Lava cavity, erosional cavity and ground fissure cavity are distributed along the railway. These cavities are closely related respectively to magmation, crustal motion and hydrodynamic activities. (3) There is no lava cavity existing underneath the subgrade. As for the ground fissure cavity and erosional cavity that endanger the safety of the railway engineering, the available treatment measures are put out for the cavities and the increasing expenditure is controllable.(4) This research conclusions can be applied to the geotechnical investigation field in volcanic activity region. ©, 2015, Editorial Department of Journal of Railway Engineering Society. All right reserved.