Jiangxi Ganyue Expressway Co.

Nanchang, China

Jiangxi Ganyue Expressway Co.

Nanchang, China
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Chen S.S.,East China Jiaotong University | Wang D.S.,Jiangxi Ganyue Expressway Co.
Advanced Materials Research | Year: 2013

Taking the bending stiffness, cable static sag and cable inclined angle into consideration, equations of space free vibration of the cable-damper system are derived in this paper. Joining the variable separation strategy and center difference method, the partial differential equations are discretized in space and a set of complex eigenvalue equations, which are solved by state space method, are derived, and both the maximum modal damping ration and the optimal damper parameter are obtained. Several typical stay cables are investigated for both the in-plane and out-of-plane modes under different cable parameters and damper parameters. The results demonstrate that modal damping ratio for the first in-plane mode is significantly affected by the cable static sag only, but those for the other modes affected by cable sag are slight, and cable static sag do not affect the optimal damper parameter for all modes, however the bending stiffness will changes both the maximum modal damping ratios and the optimal damper parameters. Some valuable suggestions are proposed for the optimal damper design. © (2013) Trans Tech Publications, Switzerland.

Zhao X.,Shenzhen Institute of Information Technology | Tang Z.,Jiangxi Ganyue Expressway Co. | Liu M.,Shenzhen Institute of Information Technology
Applied Mechanics and Materials | Year: 2011

The concept of reliability of road service level was put forward and the threshold determination method based on this concept was studied in this paper. Results of case studies showed that the proposed method for threshold determination was valuable in practice. © (2011) Trans Tech Publications.

Tan Z.-M.,Tongji University | Yu X.-H.,Jiangxi Ganyue Expressway Co.
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2012

The methods for sectional flexural stiffness equivalent conversion of asphalt pavement in different structures with different interlayer contact conditions were discussed and the modulus formulas were presented especially when temperature changed linearly along the depth of the asphalt pavement. The deflection errors in different temperatures were contrasted. The results show that the deflection based on sectional flexural stiffness equivalent modulus has the relative error less than 5%, which is of the best precision. However, when asphalt pavement is in full contact with the subjacent bed or the temperature changes intensely along the depth of asphalt pavement, the relative deflection error based on the mid-depth temperature of asphalt pavement will exceed 15%, and the relative deflection error based on the average temperature of asphalt pavement will also exceed 10%.

Li L.,Tongji University | Li L.,Jiangxi Ganyue Expressway Co. | Sun L.,Tongji University | Ning G.,Tongji University | Tan S.,Jiangxi Ganyue Expressway Co.
Promet - Traffic - Traffico | Year: 2014

A feasible pavement crack detection system plays an important role in evaluating the road condition and providing the necessary road maintenance. In this paper, a back propagation neural network (BPNN) is used to recognize pavement cracks from images. To improve the recognition accuracy of the BPNN, a complete framework of image processing is proposed including image preprocessing and crack information extraction. In this framework, the redundant image information is reduced as much as possible and two sets of feature parameters are constructed to classify the crack images. Then a BPNN is adopted to distinguish pavement images between linear and alligator cracks to acquire high recognition accuracy. Besides, the linear cracks can be further classified into transversal and longitudinal cracks according to the direction angle. Finally, the proposed method is evaluated on the data of 400 pavement images obtained by the Automatic Road Analyzer (ARAN) in Northern China and the results show that the proposed method seems to be a powerful tool for pavement crack recognition. The rates of correct classification for alligator, transversal and longitudinal cracks are 97.5%, 100% and 88.0%, respectively. Compared to some previous studies, the method proposed in this paper is effective for all three kinds of cracks and the results are also acceptable for engineering application. © 2014, Faculty of Transport and Traffic Engineering. All rights reserved.

Du Y.-C.,Tongji University | Zhang X.-M.,Tongji University | Liu C.-L.,Tongji University | Liu X.,Jiangxi Ganyue Expressway Corporation Ltd
Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology | Year: 2016

The real-time monitoring of the low visibility of the freeway is very important for the traffic safety. This paper is aimed at establishing a visual distance monitoring model which is specially applied to freeway. The visual degree is proposed, and the ratio of the pixel points of the common image and infrared image is presented, which can reflect the actual visual distance, then the paper establishes the visibility model. At the same time, the temperature correction factor is proposed for reducing the impact of temperature on the infrared image, and the correction coefficient of the camera is proposed according to the different imaging quality. Then, several areas are got by dividing the infrared image according range, and according to the distance from the camera, the visual inspection table is established through cumulative percentage of pixels for different areas. Results show that the model has a certain degree of reliability and good accuracy of less than 11%, the visibility model can be used to well determine the visual distance in the low visibility environment, which can effectively improve freeway driving safety. Copyright © 2016 by Science Press.

Zhang J.,Changsha University of Science and Technology | Dai L.,Changsha University of Science and Technology | Zheng J.,Changsha University of Science and Technology | Wu H.,Jiangxi Ganyue Expressway Co.
Journal of Testing and Evaluation | Year: 2016

To investigate the reflective crack-propagation behavior and provide control techniques for asphalt pavements widening, the finite-element models were built to simulate the widened asphalt pavement with a latent joint. The developed finite-element model considered the influence factors, including the loading modes (i.e., the symmetrical and unsymmetrical loading modes), the thickness and modulus of the asphalt concrete surface, the modulus of the new and existing stabilized bases, and the sheet stiffness of the reinforced geosynthetic. The finite-element simulation results show that increasing the thickness or reducing the modulus of the asphalt concrete surface effectively delays the propagation speed of the reflective cracks. The cracking potential reaches the minimum when the new and existing bases have a uniform modulus. Additionally, geosynthetic reinforcement across the joints significantly reduces the stress concentration around the crack tip and slows down the propagation of the reflective cracks. These benefits become greater when increasing the sheet stiffness of the geosynthetic. Finally, an experimental study was conducted to investigate the influence of the types of the asphalt overlay and the geosynthetic reinforcement on the reflective crack-propagation behavior. The experimental results indicate that the geosynthetic-reinforced structure with a lower modulus of the asphalt concrete surface significantly increases the fatigue life of widened pavements, and the polypropylene geotextile performs better than the glass-fiber grid in terms of the extension of the fatigue life. © 2016 ASTM Int'l (all rights reserved).

Zhang J.,Changsha University of Science and Technology | Chen Y.,Changsha University of Science and Technology | Wu H.,Jiangxi Ganyue Expressway Co.
International Journal of Earth Sciences and Engineering | Year: 2015

Red clays are widespread in South China. As typical unsaturated soils, they are sensitive to moisture and their mechanical performances deteriorate with moisture changing.. In order to reveal the moisture migration mechanism of the unsaturated red clays by measuring the water content in red clay cylinders at different migration time and then rationally use the local red clays as a filling material for highway embankments, a nondestructive and continuous method to measure the water content can avoid the sample to sample variation and improve the efficiency of moisture migration tests greatly. Accordingly, the red clay cylinders with three degrees of compaction of 90%, 93% and 96% and with five water contents at each degree of compaction were scanned using an X-ray computed tomography (CT). A total of 3 layers were scanned for each specimen and the average CT-value of each red clay cylinder was measured. Then, a relationship between CT-value, dry density and water content of red clay cylinders was developed. Subsequently, the tests were conducted to validate this relationship. The results show that the calculated water contents using the relationship built in this study agree favorably with the measured values, suggesting that the relationship between CT-value, dry density and water content is very accurate to measure the water content of the red clay cylinders. © 2015 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.

Zhang J.,Changsha University of Science and Technology | Xiao Y.,Changsha University of Science and Technology | Wu H.,Jiangxi Ganyue Expressway Co.
International Journal of Earth Sciences and Engineering | Year: 2015

Based on the in-situ monitoring data of the post-construction settlement of the high embankment of Hechi airport, the applicability of parametric regression models, such as the exponential model, logarithm model, hyperbolic model, root-squaring model, and power function model, to predict the post-construction settlement was discussed,. Compared with the field data, it is found that the exponential model can really reflect the laws of the post-construction settlement of the high embankment. The predicted results using exponential model show that due to the variation of the thickness of filling, the post-construction settlement at different monitoring points with is significantly different. However, the settlements of the unit thickness of filling at different monitoring points are uniform. © 2015 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.

Li C.,Chang'an University | Li C.,Jiangxi Ganyue Expressway Co. | Ju Y.-F.,Chang'an University
Proceedings of 2012 International Conference on Image Analysis and Signal Processing, IASP 2012 | Year: 2012

Research shows that traditional end-to-end delay upper bound in wireless sensor network (WSN) is pessimistic. Thus based on network calculus, this paper presents a network model with the arrival curve regulated by the leaky bucket and rate-latency service curve, and derivates an improved deterministic upper bound of end-to-end delay in WSN by improving the output bound of a flow traversing a node. Due to the stricter output bound, the delay upper bound derived in the paper is simpler and more accurate, which is useful for topology control and routing protocol design in delay-guaranteed WSN in order to improve the quality of service. Numerical results show that the paper's delay bounds are improved well, which are much tighter than traditional delay bounds. © 2012 IEEE.

Yu L.,South China University of Technology | Sun B.,Jiangxi Ganyue Expressway Co.
Proceedings of 2012 IEEE International Conference on Service Operations and Logistics, and Informatics, SOLI 2012 | Year: 2012

Four types of typical discrete Choice Models: Multinomial logit (MNL) model, Nested logit (NL)model, Heteroscedastic Extreme Value (HEV)Model and Mixed logit model, have been proposed and implemented in empirical investigations, although there is no universally acknowledged using principle. Here we report study to test this type of models in a travel mode choice case. we implemented four models calibration using software programmed by ourselves. We found that if sample data satisfied with IIA property, our experience has confirmed that MNL is the first choice in mode split forecasting. The nested logit model and Heteroscedastic Extreme Value (HEV)Model are not significantly better than the multinomial logit model. Mixed logit model corrects IIA flaw, but is somewhat more difficult to estimate. © 2012 IEEE.

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