scholarly journals Experimental Study of the Dynamic Characteristics of a New Antidrainage Subgrade Structure for High-Speed Railways in Diatomaceous Earth Areas

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 532
Author(s):  
Qian Su ◽  
Zhixing Deng ◽  
Xun Wang ◽  
Wenyi Jia ◽  
Yunbin Niu
Keyword(s):  
Dynamic Characteristics ◽  
High Speed ◽  
Diatomaceous Earth ◽  
Water Resistance ◽  
Resistance Index ◽  
Local Environment ◽  
Vibration Acceleration ◽  
High Speed Railway ◽  
Engineering Construction ◽  
Field Excitation

The experience needed to carry out engineering and construction in diatomaceous earth areas is currently lacking. This project studies the new Hang Shaotai high-speed railway passing through a diatomaceous earth area in Shengzhou, Zhejiang Province, and analyzes the hydrological and mechanical properties of diatomaceous earth on the basis of a field survey and laboratory. Moreover, a new antidrainage subgrade structure was proposed to address the rainy local environment, and field excitation tests were performed to verify the antidrainage performance and stability of the new subgrade structure. Finally, the dynamic characteristics and deformation of the diatomaceous earth roadbed were examined. The hydrophysical properties of diatomaceous earth in the area are extremely poor, and the disintegration resistance index ranges from 3.1% to 9.0%. The antidrainage subgrade structure has good water resistance and stability under dynamic loading while submerged in water. After 700,000 loading cycles, the dynamic stress and vibration acceleration of the surface of the subgrade bed stabilized at approximately 6.37 kPa and 0.94 m/s2, respectively. When the number of excitations reached 2 million, the settlement of the diatomaceous earth foundation was 0.08 mm, and there was basically negligible postwork settlement of the diatomaceous earth foundation. These results provide new insights for engineering construction in diatomaceous earth areas.

scholarly journals SUBSIDENCE EVALUATION OF HIGH-SPEED RAILWAY IN SHENYANG BASED ON TIME-SERIES INSAR

2018 ◽  
Vol IV-3 ◽  
pp. 273-276
Author(s):  
Yun Zhang ◽  
Lianhuan Wei ◽  
Jiayu Li ◽  
Shanjun Liu ◽  
Yachun Mao ◽  
...  
Keyword(s):  
Time Series ◽  
High Speed ◽  
Cross Validation ◽  
Surface Deformation ◽  
Local Environment ◽  
Local Area ◽  
Safe Operation ◽  
High Speed Rail ◽  
High Speed Railway ◽  
Under Construction

More and more high-speed railway are under construction in China. The slow settlement along high-speed railway tracks and newly-built stations would lead to inhomogeneous deformation of local area, and the accumulation may be a threat to the safe operation of high-speed rail system. In this paper, surface deformation of the newly-built high-speed railway station as well as the railway lines in Shenyang region will be retrieved by time series InSAR analysis using multi-orbit COSMO-SkyMed images. This paper focuses on the non-uniform subsidence caused by the changing of local environment along the railway. The accuracy of the settlement results can be verified by cross validation of the results obtained from two different orbits during the same period.

scholarly journals Research on Observation of Settlement Deformation of Zhengzhou-Jinan High-speed Railway and Information Platform of Observation Data

2021 ◽  
Vol 283 ◽  
pp. 02012
Author(s):  
Ni Xiuyong
Keyword(s):  
High Speed ◽  
Future Research ◽  
Observation Data ◽  
High Speed Railway ◽  
Information Platform ◽  
Engineering Construction ◽  
Data Support ◽  
The Future

In order to provide data support for engineering construction, this paper proposes to study the construction of information platform of settlement deformation observation data. In this paper, the information platform for observation data is established based on the settlement deformation data of Zhengzhou-Jinan high-speed railway. The results show that the settlement deformation observation platform in this paper can effectively integrate the data and ensure the accuracy of the data. This paper sets an example for the future research on the construction of information platform of high-speed railway settlement.

Model test on dynamic characteristics of invert and foundation soils of high-speed railway tunnel

2015 ◽  
Vol 14 (3) ◽  
pp. 549-559 ◽  
Author(s):  
Juan Huang ◽  
Tieying Yuan ◽  
Limin Peng ◽  
Jun Yu ◽  
Zude Ding
Keyword(s):  
Model Test ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Railway Tunnel ◽  
High Speed Railway

scholarly journals Rail Corrugation Detection of High-Speed Railway Using Wheel Dynamic Responses

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Jianbo Li ◽  
Hongmei Shi
Keyword(s):  
High Speed ◽  
Estimation Error ◽  
Estimation Method ◽  
Dynamic Responses ◽  
Support Vector ◽  
Vibration Acceleration ◽  
High Speed Railway ◽  
Rail Corrugation ◽  
Reconstructed Signal ◽  
Wheel Vibration

Rail corrugation often occurs on the high-speed railway, which will affect ride comfort and even the train operation safety in severe condition. Detection of rail corrugation wavelength and depth is absolutely essential for maintenance and safety. A novel method using wheel vibration acceleration is proposed in this paper, in which ensemble empirical mode decomposition (EEMD) is employed to estimate the wavelength, and bispectrum features are extracted to recognize the depth with support vector machine (SVM). Firstly, a vehicle-track coupling model considering the rail corrugation of high-speed railway is established to calculate the wheel vibration acceleration. Secondly, the estimation algorithm of wavelength is studied by analyzing the main frequency with EEMD. The optimal parameters of EEMD are selected according to the orthogonal coefficient of decomposition results and the distribution of the extreme points of signal. The depth detection is transformed to a classification problem with SVM. Bispectrum features, which are extracted from the reconstructed signal using the high-frequency components of wheel vibration acceleration, combining with train speed and corrugation wavelength are input into SVM to recognize the rail corrugation depth. Finally, numerical simulation is carried out to verify the accuracy of the proposed estimation method. The simulation results show that the proposed detection algorithm can accurately identify rail corrugation, the estimation error of rail corrugation wavelength is less than 0.25%, and the classification accuracy of rail corrugation depth is more than 99%.

scholarly journals Dynamic Simulation Method of High-Speed Railway Engineering Construction Processes Based on Virtual Geographic Environment

2020 ◽  
Vol 9 (5) ◽  
pp. 292
Author(s):  
Xinwen Ning ◽  
Qing Zhu ◽  
Heng Zhang ◽  
Changjin Wang ◽  
Zujie Han ◽  
...  
Keyword(s):  
Dynamic Simulation ◽  
High Speed ◽  
Simulation Method ◽  
3D Models ◽  
Scientific Basis ◽  
Construction Equipment ◽  
High Speed Railway ◽  
Engineering Construction ◽  
Virtual Geographic Environment ◽  
Geographic Environment

The spatial conflicts in the construction of high-speed railways not only reduce project efficiency, but also lead to serious accidents. To address these key issues, this paper presents a dynamic simulation method for constructions processes based on a virtual geographic environment. This approach can facilitate the identification of conflicts in the construction scheme through accurately expressing and analysing the intricate spatio-temporal relations among railway facility components, construction equipment and the surrounding environment. First, a high-precision virtual geographic scene in which the construction process and methods can be visualized and modelled intuitively is established with terrain, imagery, and engineering 3D models. Then, the overall construction processes can be accurately simulated by a sequential display of the railway components and the behaviour of construction equipment. To simulate the behaviour of construction equipment, the linkage relations between each joint of construction machinery are accurately modelled and animation control parameters are extracted. Finally, a construction simulation of a high-speed railway bridge was performed, and the experimental results show that the proposed method can provide a scientific basis for the optimization of complex engineering construction schemes, safety hazard assessments, and related full life cycle tasks.

Dynamics of a Current Collector for a High-Speed Railway

1975 ◽  
Vol 97 (2) ◽  
pp. 731-738
Author(s):  
Kazuo Yoshida ◽  
Katsushi Manabe ◽  
Taro Shimogo
Keyword(s):  
Dynamic Characteristics ◽  
High Speed ◽  
Current Collector ◽  
Experimental Investigations ◽  
High Speed Railway ◽  
Collector System ◽  
Train Speed ◽  
Proper Values ◽  
Very High ◽  
A Current

In this paper, a mathematical model of a collecting rail and collector system with sliding contactors is proposed for a current collector system of a very-high-speed railway. Its dynamic characteristics, especially the variation of contact force and the probability of contact break, are investigated by means of linear analysis. In order to prove the appropriateness of the linear model, the computer simulation and theoretical analysis are performed using a nonlinear model. Experimental investigations are also performed in order to examine the dynamic characteristics of the model. From these results, it is concluded that the probability of contact break can be kept to less than about 10 percent for a train speed of 500 km/hr by choosing the proper values of natural frequencies and damping ratios under constraints.

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