China Construction Second Engineering Bureau Ltd.

Beijing, China

China Construction Second Engineering Bureau Ltd.

Beijing, China
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Li J.,Nanjing Southeast University | Sun W.,Nanjing Southeast University | Jiang J.,Nanjing Southeast University | Jin Z.,Qingdao Technological University | And 3 more authors.
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | Year: 2013

In order to study the key properties, properties evolution and evolution mechanism of sacrificial concrete (SC) under high temperatures, free water content and chemical composition of SC were investigated by weight loss under 105°C and X ray fluorescence (XRF) analysis. Then, the effect of polypropylene fiber on the strength, pore structure and micro-morphology of SC under high temperatures were studied by compressive strength, computed tomography scan (CT) and scanning electron microscopy (SEM). The experimental results show that the proposed sacrificial concrete has great fluidity and mechanical property. The mass fraction of free water content is only 4.4%, while those of SiO2 and Fe2O3 are 48.8% and 30.0%, respectively, which meets property requirements of SC used for the third generation of nuclear power plant. With the increase of temperature, Fe2O3 in sacrificial concrete is gradually reduced into Fe3O4, and concrete surface becomes loose gradually; meanwhile, the number of fine and wide cracks increase, and the porosity of SC increases by 31.3% to 42.8% maximally. The compressive strength under 900°C is reduced to 27.1% to 33.0% of original strength. Although the addition of polypropylene fiber reduces fluidity and strength of SC, it causes 5% to 8% increase of high temperature residual compressive strength. Furthermore, spalling under high temperature does not occur in SC specimen containing fiber.


Qin H.-L.,China State Construction Engineering Corporation | Zhang J.-F.,Tongji University | Zhang J.-F.,China Airport Construction Group Corporation of CAAC | Guo Y.-C.,Zhengzhou University | Li F.,China Construction Second Engineering Bureau Ltd.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2012

The physical meanings of the parameters for the porous elasticity model and the critical state plasticity model in ABAQUS, a popular commercial finite element software, are discussed, and the methods to decide the parametric values from triaxial compression tests or oedometer tests are presented. Based on the relationship among the normal consolidation line, unloading-reloading line, K0 consolidation line and the critical state line of e-lnp' curves and the modified Cam-clay model, the correlation between the initial void ratio and the mean effective stress in the field is deduced and used in the simulation by ABAQUS. A soil-nailing case is simulated in ABAQUS by means of the porous elasticity model and the critical state plasticity model. The deformation results of this soil nailing case are analyzed, and the rationality is verified by the monitoring data in practice.


Yong A.J.,Beijing Jiaotong University | Yong A.J.,China Construction Second Engineering Bureau LTD
Electronic Journal of Geotechnical Engineering | Year: 2016

Plane strain model test system of the effect of the pile foundation load on the ground settlement caused by excavation of the shallow circular tunnel near the pile foundation is established; the effect of the existing pile foundation load with different vertical, horizontal relative location on the stratum subsidence of the shallow circular tunnel near the foundation is researched by the model test. Moreover, the model test and different working conditions are carried on the numerical simulation that is adopted by ANSYS. The results show that: 1) the effect of the pile foundation load with same pile diameter and pile length on the ground settlement is increased with the horizontal distance between the pile foundation load and the tunnel is decreased. The influence of the pile foundation load on the ground settlement is larger and the tunnel is dangerous when the ratio of the horizontal distance between the pile foundation and the tunnel compare to tunnel diameter is between 0 and 3.5.When the ratio is between 3.5and 5.5, the influence is small and the influence is ignored when the ration is equal or greater than5.5. 2) the effect of the pile foundation load with same pile diameter and horizontal distance and different pile length on the stratum settlement is maximum in the condition that the ratio of the pile length and the depth of tunnel is 1. The extent to which the pile foundation load affects the ground settlement is reduced with the ratio is decreased when the ratio is less than 1. The effect of the change of the pile length on the ground settlement is small when the ratio is more than 1. © 2016 ejge.


Wu Y.,Chongqing University | Zhou Z.,Chongqing University | Li L.,Chongqing University | Li Y.,China Construction Second Engineering Bureau Ltd
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2015

Considering the effects of different steel ratio of concealed steel columns and diagonal braces, seismic behavior of three 1/4 scaled low-rise high strength reinforced concrete walls with concealed steel truss, were investigated through quasi-static tests. Numerical analysis by the finite element software ABAQUS was conducted. By studying experiment phenomena, including the failure pattern, hysteresis loops, skeleton curves, displacement ductility and stiffness degradation process, it is indicated that the specimens mainly fail in flexure. The displacement ductility can be improved significantly, and the post-yield stiffness degradation is smoother compared with the normal high strength concrete low-rise shear wall without concealed steel truss, implying the effectiveness of the concealed truss. As the steel ratio of concealed braces is raised, the maximum horizontal bearing capacity is increased slightly, while the displacement ductility and hysteretic energy dissipation capacity can be improved significantly. Numerical simulation results of ABAQUS agreed well with experiment results. ©, 2015, Science Press. All right reserved.


Qin H.-L.,China State Construction Engineering Corporation | Guo Y.-C.,Zhengzhou University | Li F.,China Construction Second Engineering Bureau Ltd.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

ABAQUS is a popular commercial finite element software and the clay plasticity model presented in it can perfectly simulate the stress-strain behavior of the normally consolidated clay. A three-dimensional finite model is established in ABAQUS to study the deep excavation effect on the underpinning piles which are constructed before the soil excavation. The parameters employed by the porous elasticity model and the critical state plasticity model in ABAQUS are decided according to the triaxial compression tests or oedometer tests. To verify the numerical simulation results, the initial void ratio obtained from the programmed subroutine and the deformations due to the soil excavation are analyzed. The variation of the axial forces with the soil excavation is presented. The distribution of the axial forces and bending moments for the piles at different locations can be obtained from the numerical simulation results. The regularities of distribution for the forces and moments are discussed and the influence factors are also mentioned. The results obtained here can be referred for similar practices.


Qin H.-L.,Chinese Research Institute of Highway | Qin H.-L.,China State Construction Engineering Corporation | Li F.,China Construction Second Engineering Bureau Ltd | Guo Y.-C.,Zhengzhou University
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

It is well known that installation of diaphragm walls in heavily overconsolidated soils will cause substantial ground deformation and can influence the behaviour of the wall during the main excavation process. However, it has not been considered that the installation effect of the panels of ultra-deep diaphragm wall in normally consolidated soils. A popular commecial finite element software, ABAQUS, is employed to simulate the panel installation process of a ultra-deep diaphragm wall in normally consolidated clay. The clay plasticity soil model in ABAQUS, which is based on the modified Cam clay model, is selected to simulate the clay characteristic. The physical meanings of the parameters for the clay model in ABAQUS are discussed, and the methods to decide the parameter values from triaxial compression tests or oedometer tests are presented. A formula for the initial void ratio and the mean effective stress in the field is deduced and used in the simulating by ABAQUS. Three-dimensional numerical models are established to simulate the installation process of the panels, including excavation under a bentonite support, placing and subsequent hardening of concrete. The deformation characteristics of the soil layers induced by the construction of wall panels as well as the influences from the width of the wall panels and the weight of the bentonite slurry are studied.


Liu Y.,China Construction Second Engineering Bureau Ltd.
Proceedings - 2013 5th Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2013 | Year: 2013

For some structures, the overturning behavior of a single pile foundation will be the controlling factor. This paper is to present the overturning behaviors about prismatic, belled and step tapered single piles by using the FEM method. The interaction laws between foundations and the soil were investigated. Based on these results, the antidumping countermeasures were suggested, thus to solve anti-overturning issues economically. © 2013 IEEE.


Zhang Q.,China Construction Second Engineering Bureau Ltd. | Lu F.,Qingdao Technological University | Jin Z.,Qingdao Technological University
Advanced Materials Research | Year: 2012

The regulation of sulfate irons in concrete was determined by spectrophotometer under different conditions, and the comparison between dissolve acid method and weight method was used to determine sulfate irons in this paper. Results show that if the volume of solution is the same, sulfate ions content in concrete decreases with the increase of sample quality, and stabilizes finally. If the sample quality and the volume of solution is the same, sulfate ions content in concrete increase with the increases of temperature, and stabilizes finally. If the soak period is the same, sulfate ions content in concrete gradually become stable. Results show that the sulfate ions content in concrete approximately follow linear distribution by use of spectrophotometer method and the weight method.

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