Henan Zhongyuan Expressway Co.

Zhengzhou, China

Henan Zhongyuan Expressway Co.

Zhengzhou, China
SEARCH FILTERS
Time filter
Source Type

Weng X.-L.,Chang'an University | Zhang C.,Henan Zhongyuan Expressway Co. | Li C.-L.,Shaanxi Provincial Communication Construction Group | Shang S.-P.,Chang'an University | Li H.-Y.,Chang'an University
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2013

In order to clearly describe the additional deformation of pavement layers between the old and new subgrade with differential settlement, a full scale model test was carried out to study the strain response of asphalt concrete pavement layer using a large subgrade differential settlement platform. The results indicate that the entire pavement is in tension under the foundation differential settlement and the lower layer is more affected; plastic deformation will develop in surface layer when the differential settlement reaches 14 cm; geogrid in old and new subgrade can alleviate the lower foundation differential settlement and increase the additional deformation of the pavement; to some extent, the vehicle load can alleviate the additional deformation due to the differential settlement; upon the occurrence of hollows under the pavement, deformation will be reflected in the asphalt pavement layers in the form of crown under the action of gravity.


Zhong Y.,Nanjing Southeast University | Zhong Y.,Huaiyin Institute of Technology | Huang X.,Nanjing Southeast University | Liao G.,Nanjing Southeast University | And 2 more authors.
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | Year: 2011

In order to study the influence of subgrade thawing settlement deformation on the mechanical properties of flexible pavement in permafrost region, two thawing settlement deformation simulation methods of frozen soil subgrade, i.e. loose paving soil and burying industrial ice block, were adopted. Laboratory large-scale experiment tank of flexible pavement structure was built and transducers were buried layer by layer. The stress and strain detection of flexible pavement surface course and base course were carried out by bearing plate test method. Through the analysis of detection data, the influence law of thawing settlement deformation on stress and strain of flexible pavement was obtained. The results show that the bottom strain of surface course and base course of loose paving soil and burying industrial ice block measuring points are both significantly increased compared to the normal measuring points. The surface course of thawing settlement measuring point bears more stress than the surface course of normal measuring point. Thawing settlement deformation has a larger effect on nonlinear characteristics of strain in layers bottom especially bottom of base course. Power function can well describe its nonlinear variation law. The research result will provide a reference for flexible pavement design in permafrost regions.


Liao G.,Nanjing Southeast University | Lu C.,Henan Zhongyuan Expressway Co. | Huang X.,Nanjing Southeast University
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | Year: 2010

Within the asphalt pavement with cement-treated base (CTB) in test tank, layered measure and analysis method is introduced to measure vertical compressive stresses, strains and deflections. Double-layered elastic theory is used to back-calculate and verify resilient modulus of pavement layer. Results show that, minor changes of subgrade resilient moduli have little effects on mechanical responses of pavement layers. Vertical compressive stresses on top of base and compressive strains at the bottom of surface layer increase linearly as loads increase. Resilient moduli of cured CTB layer and surface layer can be taken as constant. Double-layered back-calculation method of resilient modulus is rational and feasible with high accuracy. During the layered measure and analysis, vertical compressive stresses should be firstly considered to obtain better precision.


Zeng L.W.,South China University of Technology | Zhang S.X.,HeNan ZhongYuan Expressway Co. | Zhang X.N.,South China University of Technology
Advanced Materials Research | Year: 2014

It has become one of the focus topics that using CT (Computer Technology) to obtain asphalt internal microstructure, but combining CT scan cross-sectional different characteristics to carry out digital image processing is rare at this stage, technical means that distinguishing internal material are still relatively rough and arbitrary large, can not be combined between digital image processing and mixture not damage test together effectively. This paper carried out image segmentation based on EM algorithm of Gaussian mixture model (GMM), analysis microstructure uniformity quality of asphalt mixture, and explores internal volume composition case by testing deeply. The results show that Gaussian Mixture Model(GMM) used in this paper can handle CT scan tomographic images better, judge aggregate distribution of asphalt mixture by sector scan method, and evaluate uniformity distribution of asphalt mixture aggregates through aggregate particles area ratio statistical analysis, the research results of this paper can provide reference significance for asphalt microscopic field study. © (2014) Trans Tech Publications, Switzerland.


Weng X.,Chang'an University | Cui Z.,Henan Zhongyuan Expressway Co. | Song W.,Chang'an University | Ma H.,Chang'an University
Journal of Southeast University (English Edition) | Year: 2013

By the use of a large-scale ground differential settlement simulator, a full-size model test is performed to study the strain response and the deformation behavior of both the wearing course of asphalt cement and the base course of cement-stabilized gravel. Moreover, with the differential settlement at the bottom of the pavement structure as the constraint condition, a plane finite element model is established, which is used to study the stress variation of different pavement layers in response to the differential settlement of varying magnitudes. It shows that, under the effects of the ground differential settlement, the wearing course is subjected to the tensile stress while the base course to the compressive stress and the maximum additional tensile stress and compressive stress occur in the area of 1 m from the splicing joint between the new and the old subgrade. Plastic deformation develops in both layers when the ground differential settlement reaches 14 cm. When the differential settlement at the bottom of the pavement goes up to 1 cm, the maximum additional stress in the surface of the base course will reach 0.28 MPa, which surpasses 0.276 MPa that is specified in the current specifications as the maximum splitting tensile strength for cement-stabilized base material. © right.


Weng X.,Chang'an University | Weng X.,China Communications Construction Company Ltd. | Li L.,Henan Zhongyuan Expressway Co. | Zhang L.,China Communications Construction Company Ltd.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010

To study the wetting mechanism of widening loess roadbed and its failure modes, the deformation measurement system is installed on geotechnical centrifuge. To achieve the actual stress with the loess embankment broadening, the Xi'an-Tongguan Expressway is adopted. The results show that the widening embankment slope toe with high water content will influence loess roadbed stability in the zone with shallow water level. During the heavy rainfall or the sudden jump of the water level under the embankment load, the local loess soil instability will greatly threaten the safety of the widened embankment, and the flooding-damaged formation of slip surface is a progressive failure process. Due to local swampy ground and low shear strength, initial shear failure of foundation will occur on the old road slope once the foot of the wetting slope causes excessive distortion generated by the global body from top to bottom of the slip slope. The sliding surface of loess roadbed is approximately circular shape, and the method for stability evaluation of the foundation under widening load is proposed using fissures arching. The results also show that the new and old roadbeds with reinforced materials in soils attached to the role can form an effective soil arching effect, they can make the best of embankment rigidity to adjust deformation of the foundation settlement.


Zhang S.-X.,South China University of Technology | Zhang S.-X.,Henan Zhongyuan Expressway Co. | Zhang X.-N.,South China University of Technology | Xu W.,South China University of Technology | And 3 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

Some shortcomings of the existing design theories and methods for fatigue cracking of a steel bridge deck pavement's epoxy asphalt concrete were analyzed. Based on the fracture mechanics and the energy method principle, impact toughness was taken as an epoxy asphalt concrete mix design evaluation index, and the feasibility of this index was verified with testing. The residual stiffness modulus ratio was adopted to reflect the epoxy asphalt concrete fatigue performances. The relationship between impact toughness and residual stiffness modulus ratio was established. The results showed that there is a good linear correlation between impact toughness and fatigue performances; the impact toughness index can be used to evaluate the epoxy asphalt concrete mix design and its fatigue performances effectively; the proposed method is simple, fast and correct, it provides a new idea for the epoxy asphalt concrete design theory and method.


Chen Y.,Chang'an University | Liu L.,Chang'an University | Duan Y.,Henan Zhongyuan Expressway Co.
Advanced Materials Research | Year: 2013

The Cuplok steel tubular scaffoldings (referred to as: CSTS) are large-scale temporary facilities in bridge construction. Recent years many collapse accidents cause people to think about the safety issue of scaffoldings. The content of safety monitoring of CSCT is put forward. On the base of bridge construction monitoring, the monitoring and control procedures and methods of CSTS is descripted in detail. An instant shows that the safety monitoring can effectively ensure the safety of the CSTS in construction. © (2013) Trans Tech Publications, Switzerland.


Weng X.-L.,Chang'an University | Zhang C.,Henan Zhongyuan Expressway Co. | Ma H.-H.,Chang'an University | Song W.-J.,Chang'an University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

The additional stress imposed on different pavement structures with differential settlement between the new and old foundations of a widened road is studied. By the use of a large-scale ground differential settlement simulator, full-size model tests are performed to study the strain response and the deformation behavior of pavement layers. The results show that under the effect of differential ground settlement, the asphalt cement wearing course is subjected to tensile stress. Plastic deformation will develop in both layers when the differential settlement reaches a value of 14 cm, which is recommended as the critical control standard for ground differential settlement. On the basis of the model test results, and with the differential settlement at the bottom of pavement as the constraint condition, a two-dimension finite element model is established for the uncoordinated deformation of the subgrade, which is used to study the stress variation of different pavement layers in response to differential settlements of varying magnitude. The results indicate that when the differential settlement at the bottom of pavement reaches 1 cm, the maximum additional stress in the surface of the base course will surpass the maximum splitting tensile strength for the cement-stabilized base materials specified in the current specifications. Therefore, 1cm is recommended as the critical control standard for the differential settlement at the bottom of pavement. In addition, an approximate formula is deduced to calculate the critical control standard of ground differential settlement (Sc) which is expressed as Sc=1000λ (16.8l2-30.4l+17.1), in which λ is the rate of the reverse slope of the pavement and l is the ratio of the width of the new road to that of the original one.


Liu J.,Henan Zhongyuan Expressway Co. | He M.,Chang'an University | Xu H.,Chang'an University | Wang Q.,Chang'an University | Yang Y.,Chang'an University
Applied Mechanics and Materials | Year: 2012

In order to study the rapid and efficient identified method of accident-prone section in montane highway, the method of principal component - gray clustering analysis has been proposed. By deep analysis of the characteristics of accident-prone section, the identified indexes of accident-prone section have been screened out, the reducing dimensionality of principal component analysis and incomplete information processing of gray clustering analysis have been organically integrated, and the clustering weight coefficients are creatively determined based on the information content. Based on data investigation and treatment, using the identified method of principal components - gray clustering analysis, the security level of sections is achieved by programming. The results show that this identified method has high precision and convenience in aspects of aggregative indicators selected and clustering value calculated. The identified method can effectively identify the security level of accident-prone section, and divide the section security level into 4-grade. Aiming at the identified results, the security measures are further researched. So the identified method has practical value.

Loading Henan Zhongyuan Expressway Co. collaborators
Loading Henan Zhongyuan Expressway Co. collaborators