China Jingye Engineering Technology Co.

Beijing, China

China Jingye Engineering Technology Co.

Beijing, China
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Li Z.,The MCC Group | Li Z.,China Jingye Engineering Technology Co. | Liu Z.,The MCC Group | Liu Z.,China Jingye Engineering Technology Co. | And 4 more authors.
Tongji Daxue Xuebao/Journal of Tongji University | Year: 2011

Based on ADINA, a 3D auger-soil FEM model was developed to study the impact of pattern of the drill auger, screw-pitch and the soil parameter on the required torque. Secondly, the model tests of auger squeezing into cement-soil mixture were done to get the optimized drill auger with least torque. At last, on-site test result of drill auger squeezed into ground verified the correctness of the numerical analysis and model test. The conclusions in this paper can provide a basis for optimal design of drill auger.


Fu C.,Fuzhou University | Fu C.,Liaoning University | Jiang S.-F.,Fuzhou University | Du Q.,China Jingye Engineering Technology Co.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2010

Modal parameter identification is the core and key of structural health monitoring and damage detection, which is crucial to evaluate the life and safety of a structure. This paper proposes a novel method for modal parameter identification. At first, the response signal is pre-processed by the band-pass filter, and then a series of Intrinsic Mode Functions (IMFs) are separated using the Empirical Mode Decomposition (EMD) from the measured response signals. Next the real IMF is determined by the correlative coefficient between the separated IMF and the measured signal. Finally, the Natural Excitation Technique (NExT) and ARMA model are combined to identify structural modal parameters as soon as the real IMF is obtained. The presented method is applied to identify modal parameters of a 7-storey framed-structure. The identification results are compared with those of other identification methods, namely HHT and NExT/ARMA. This research shows that the approach proposed can extract modal parameters effectively, and also has excellent adaptability.


Li Z.-Y.,China Jingye Engineering Technology Co. | Li Z.-Y.,Central Research Institute of Building and Construction Co. | Han J.-F.,Beijing University of Technology | Liu X.-H.,China Jingye Engineering Technology Co. | And 3 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

Based on the ADINA software, a three-dimensional temperature field model for PE pipes, anchors and soils with the characteristics of coupling of fluid and solid is established to analyze the heat transfer performance of energy anchors. Since the pipe fluid speed, soil properties and filled materials play important roles in the heat transfer performance of the energy anchors and the trend of soil temperature field surrounding the anchor holes, the model provides an effective way to get the best fluid speed and the temperature of supply water. The proposed model provides a theoretical basis for the parameter optimization of engineering design.


Liu Z.,The MCC Group | Liu Z.,China Jingye Engineering Technology Co. | Yang S.,The MCC Group | Yang S.,China Jingye Engineering Technology Co. | And 4 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

In order to study the difference of bearing capacity and deformation properties between soil displacement screw pile and continuous flight anger pile, three results of full scale field load tests from Australia, Germany and China are illustrated. The increased amplitude of bearing capacity of SDS pile compared to CFA pile and the mechanism of technological advantages of SDS pile are analyzed. The research results show that the SDS piling technology is suitable for a wide range of compressible soil conditions, and the positive soil compacting effect induced by short displacement screw auger during piling construction leads to high stress level, which improves the bearing capacity and deformation of soil around pile and therefore enhance the ultimate bearing capacity by increasing friction force on side of pile.


Li Z.,Central Research Institute of Building and Construction Co. | Li Z.,China Jingye Engineering Technology Co. | Liu Z.,Central Research Institute of Building and Construction Co. | Liu Z.,China Jingye Engineering Technology Co. | And 4 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011

Due to the high bearing capacity, high productivity of installation and non-pollution on site, such soil displacement screw(SDS) pile has been widely applied in many countries. But there is no successfully engineering application report in China yet. To study soil compaction effect, bearing characteristics, distribution of side friction resistance of SDS pile and the difference between SDS pile and cement flyash gravel(CFG) pile, two field tests are carried out in a site in Beijing. Test results show that the surface vertical displacement during construction is mainly completed from the beginning of auger drilling to the auger's compaction part squeezing into the soil wholly; then the surface vertical displacement tends to stabilize. The soil compaction effect is mainly completed within 4 times the pile diameter; and the higher the soil compressibility is, the larger the soil compaction scope is. The ultimate bearing capacity of SDS pile can be increased by 30%-50% compared with CFG pile at the same settlement of the pile top.

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