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Feng Z.-J.,Chang'an University | Wu Y.-L.,Chang'an University | Cheng C.,Chang'an University | Liu X.-F.,Guangdong Highway Design Institute Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

The characteristics of salt-dissolution and salt-heaving of plate-like saline soil are systematically studied on the basis of laboratory experiments. The results show that the plate-like saline soil is collapsible soil, and the coefficient of collapsibility increases with the increase of the salinity. The salt-heaving temperature is ahead of time as the sodium sulfate content increases, and finally the salt expansion force has a great increase. As the sodium sulfate content increases, the intensity salt-heaving range is closer to the intensity sodium sulfate precipitation range. The salt-heaving can be restricted by a certain load. All the above shows that in engineering practices of the plate-like saline soil, we must pay attention to the environmental characteristics and take some appropriate treatments.


Lin Y.,Guangdong Highway Design Institute Co. | Li B.,Guangdong University of Technology
Advanced Materials Research | Year: 2012

Using SBR and epoxy to modified warm-mix asphalt, the penetrability, ductility, softening point of bitumen at different aging times are tested, the comparative analysis of the modified effects of two modified agents to the asphalt mixture is made; Construction temperature of asphalt is determined by using temperature - porosity curve; The results reflect epoxy resin and SBR can improve the high temperature stability and anti moisture infringement capacity, so propose to use warm mix asphalt concrete for the top layer except in special sections layer. © (2012) Trans Tech Publications, Switzerland.


Feng Z.-J.,Chang'an University | Cheng C.,Chang'an University | Cheng C.,China Communications Construction Company Ltd. | Liu X.-F.,Guangdong Highway Design Institute Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

The plate-like saline soil in extremely arid desert area is different from that of conventional bulk. To find out the effects of the microstructural changes of the plate-like saline soil on its strength, the composition, microstructure and properties of unconfined compressive strength of the plate-like saline soil are studied, and the effects of microstructural changes of the plate-like saline soil on its strength are analyzed. The results show that the plate-like saline soil is mainly composed of chloride, and the content of chloride, and sulfate in the plate-like saline soil is more than 8%, some even exceeds 60%. The main mineral components are limestone, quartz, albite, ramps pyrochlore, illite and kaolinite. The plate-like structure cemented by sand, NaCl and Na2SO4 is in dense situation. Because of the difference of soluble salt content and cement, the differences of properties of unconfined compressive strength caused by microstructural changes are great. The plate-like saline soil has the characteristics of the rock in strength, and its value varies from 3.8 MPa to 20.2 MPa according to its structural characteristics. It can be defined as rock salt based on its salt component and mineral characteristics. The results provide a new basis for a better understanding of the formation of the plate-like saline soil and its engineering properties. This study also lays the foundation for the treatment technology of the plate-like saline soil in engineering.


Tan Y.-Q.,Harbin Institute of Technology | Zhao L.-D.,Harbin Institute of Technology | Lan B.-W.,Guangdong Highway Design Institute Co. | Chen K.-Q.,Highway Administration Bureau of Guizhou Province
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2011

The influence of repeated condensation of ice on volume indexes, mechanical properties, high and low temperature performance and water stability of asphalt mixture were analyzed through related experiments. For southern plateau wet pavement, the dense gradation AC-16 mixture was adopted in experiments, which was used to be the top layer of local asphalt pavement. The experimental condition was established according to actual condition, and kinds of performance experiments were executed with specimens under different condensation of ice. The results show that the initial void plays major role on the void of mixture during repeated condensation of ice. The high temperature stability of mixture decreases with the increase of repeated condensation of ice. The mechanical properties, water stability, and low temperature properties of mixture have different degree of attenuation after repeated condensation of ice, which decay rapidly at about first 8 cycles, then tends to be stable.


Chen J.-X.,Chang'an University | Wang C.,Guangdong Highway Design Institute Co. | Luo Y.-B.,Chang'an University | Gai Q.-S.,The 4th Company of China Railway 13th Group | Wu K.-F.,The 4th Company of China Railway 13th Group
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

During the construction of systematic bolts in high-water-content soil tunnels, there are disadvantages, such as difficult hole completion, poor grouting effect, low anti-drawing strength, poor supporting effect and low cost-effectiveness ratio. In order to overcome the above disadvantages during the tunnel construction, the elimination of systematic bolts in high-water-content soil tunnels is proposed, and a new support structure of the combination of steel arch, shotcrete, reinforcing mesh, locking anchor pipe and longitudinal link steel bar is employed. In order to study high-water-content soil tunnel without systematic bolts on site, two monitoring sections are set in VI class surrounding rock of Tianhengshan Expressway tunnel of Harbin orbital expressway. The results show that the stress and deformation of the supporting structure are within the allowable range under the condition of elimination of systematic bolts replaced with locking anchor pipe, and that the primary support is safe. It can reduce the construction period and expenditure in high-water-content soil tunnel without systematic bolts and has significant economic value and social benefit.


Wang M.-N.,Southwest Jiaotong University | Zhang X.-J.,Guangdong Highway Design Institute Co. | Gou M.-Z.,The Second Railway Survey and Design Institute | Cui G.-Y.,Southwest Jiaotong University
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

It is difficult to simulate the whole process of shield tunneling and divide the overlapped shield tunnel. Combined with overlapped tunnel in Shenzhen Metro Hongling Zhonglu-Laojie-Shaibu interval to establish a more comprehensively 3D numerical simulation method, reflecting the characteristic of the whole tunneling process and divide shield tunnel from its horizontal direction on the basis of the index of Mohr-coulomb, longitudinal partition according to displacement rate of change. The results show that: the horizontal adjacent partition is: no-effect area when F≤Fα, weak-effect area when Fα


Liu A.,Guangzhou University | Shen F.,Guangdong Highway Design institute Co. | Zhang J.,Guangzhou University | Yu Q.,Guangzhou University | Wang H.,Guangzhou University
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2012

A new leaning-type arch bridge was studied. Both lateral and radial mechanical models of the transverse brace between the main arch rib and the stable arch rib were proposed, when lateral buckling occurs. Based on Ritz method, numerical model of the main members of leaning-type arch bridge for calculation of the deformation energy, external loading potential energy and non-directional load potential energy of the hangers were constructed, and an analytical solution of the lateral buckling critical load was derived. Comparing results with those obtained from FEM calculations, it was verified that the analytical solution presented in this paper is sufficiently accurate. The study indicate that: 1) the lateral buckling critical load can be increased about 1.6~1.8 times by setting the stable arch ribs, and the critical load would increase with the increase of the inclination angle of the stable arch rib; 2) the critical load can be increased by 3.5 times due to the influence of the non-directional load of the hangers and bridge deck; 3) the radial bending stiffness of transverse braces has great impact on the critical load.


Wang L.,Guangdong Highway Design Institute Co. | Wang L.,Hunan University | Xu Y.,Tongji University
World Information on Earthquake Engineering | Year: 2015

In order to study the influence of a new type lateral steel damping device on the seismic performance of the cable-stayed bridge, a 1:20 scaled test model of Guangdong Rongjiang river Bridge was designed, constructed and tested on four shaking tables system. The results show that the fundamental frequency of the system with new type lateral steel damping devices is lower than that of transverse consolidation system. Compared to transverse consolidation system, the lateral steel damping device can reduce the peaks of structural displacement responses and acceleration responsesmore effectively. With increase of peak seismic acceleration, the damping effect is more obvious. It is proofed that the system with new type lateral steel damping device is reasonable. Therefore the appropriate lateral steel damping device may be chosen to improve the seismic performance of cable-stayed bridge. © 2015, Science Press. All right reserved.


Wang L.,Guangdong Highway Design Institute Co. | Wang L.,Hunan University | Xu Y.,Tongji University
World Information on Earthquake Engineering | Year: 2015

Rongjiang Bridge is a low-pylon cable-stayed bridge with flexible girder, in order to study it's reasonable longitudinal seismic structural system and seismic reduction measures, a 1:20 scaled test model was designed and constructed, and tested on four shaking tables system. The testing models of two seismic structural systems, i. e. unconfined system and viscous damper system were established by change of connecting way between the main girder and the middle pylon. The bridge seismic responses of the two systems were tested under different seismic excitation. The experimental results show that in comparison to free system, viscous damper system can not reduce the peaks of structural longitudinal acceleration response, but can reduce the peaks of structural longitudinal displacement response effectively. With the increase of peak earthquake acceleration, the effect of displacement control is more apparent. Structural seismic responses under different seismic excitations with the same peak acceleration are different, even different obviously. Therefore the seismic waves with similar site spectrum feature should be chosen to do bridge seismic design. ©, 2015, Science and Technology Periodical Press. All right reserved.


Li F.,Tongji University | Wu P.,Tongji University | Liu D.,Guangdong Highway Design Institute Co.
Steel and Composite Structures | Year: 2012

This paper presented a new aerial platform-AERORail for rail transport and its structure evolution based on the elastic stiffness of cable; through the analysis on the cable properties when the cable supported a small service load with high-tensile force, summarized the theoretical basis of the AERORail structure and the corresponding simplified analysis model. There were 60 groups of experiments for a single naked cable model under different tensile forces and different services loads, and 48 groups of experiments for the cable with rail combined structure model. The experimental results of deflection characteristics were compared with the theoretical values for these two types of structures under the same conditions. It proved that the results almost met the classical cable theory. The reason is that a small deflection was required when this structure was applied. After the tension increments tests with moving load, it is verified that the relationships between the structure stiffness and tension force and service load are simple. Before further research and applications are made, these results are necessary for the determination of the reasonable and economic tensile force, allowable service load for the special span length for this new platform. Copyright © 2012 Techno Press.

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