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Liu H.-K.,South China University of Technology | Fan Z.,South China University of Technology | Zhang Y.-C.,Guangdong Research Institute Resources and Hydropower
Advanced Materials Research | Year: 2013

A test of bending resistance and reinforcement is carried out on RC beams reinforced by applying sheet of glass fiber reinforced plastics (GFRP). A study and analysis is given to the traits of bending and rupture of RC beams reinforced by applying GFRP and to the effect of GFRP on ultimate bearing capacity and stiffness of the beams. The strengthening effect is investigated to give guidance in practice work. © (2013) Trans Tech Publications, Switzerland.


Fan Z.,South China University of Technology | Zhang Y.-C.,GuangDong Research Institute Resources and Hydropower | Liu H.-K.,South China University of Technology
Advanced Materials Research | Year: 2013

Based on the theory and practice of existing composite foundation, this paper discussed the design idea and introduced the bearing capacity and deformation calculation method of the long-short-pile composite foundation. And it verified the feasibility of this method by engineering example. The results show that: the CM long-short-pile composite foundation which can effectively improve the bearing capacity, reduce the building settlement and differential settlement, and fully exert the potential of soil between piles, has theoretical research and engineering application value. © (2013) Trans Tech Publications, Switzerland.


Hu H.,Pearl River Water Resources Scientific Research Institute | Zhang Y.,GuangDong Research Institute Resources and Hydropower
2011 International Conference on Multimedia Technology, ICMT 2011 | Year: 2011

Development and utilization of urban underground space is conducive to improving the urban functions, giving full play to the city's social, environmental and economic benefits, but also inevitably encounters many new and more complex geotechnical engineering problems. In this paper, we took a foundation project above the metro subway tunnel in Guangzhou as an example, for which a numerical model was established to calculate and analyze the influence of excavation on the existing tunnel from aspects of deformation, additional stress of tunnel segments and anti-floating stability. The results show that the excavation inevitably leads to soil deformation at the bottom of the foundation pit, which causes displacement of the tunnel and change of the stress state of the tunnel segment. The results provide valuable reference to the project design and construction. It is helpful to other similar projects. © 2011 IEEE.


Zhang Y.-C.,GuangDong Research Institute Resources and Hydropower | Yang G.-H.,GuangDong Research Institute Resources and Hydropower | Hu H.-Y.,Pearl River Water Resources Scientific Research Institute
Advanced Materials Research | Year: 2012

Problems and flaws of existing safety criteria for vibration are reviewed. A simple consideration of particle vibration velocity cannot fully reflect the inherent law of effects of explosion earthquake on structures. Sometimes the occurrence of explosions exceeding the standard velocity for safety will not necessarily cause damage to structures and those below the standard velocity for safety may destroy structures. For this reason, the free vibration frequency of structures and the safety margin of the structure should be considered. Based on safe, practical and convenient conditions, that in respect of safety criteria for dike and slope exposed to vibration, two indicators, i.e., stability factor of dike and slope and vibration velocity of particle, can be used to determine the effect of vibration on them is proposed. That is to say, pseudo-static method is adopted to make vibration inertia force equivalent to a static force on slope bars and then strength reduction method or limit equilibrium method is used to calculate the safety factor, which can directly evaluate the stability of slope. In combination with the particle vibration velocity given in specifications, the safety of dike and slope can be determined. Lastly, specific engineering cases are used to validate the rationality of this criterion. This method can serve as a reference for similar projects.


Hu H.-Y.,South China University of Technology | Zhang Y.-C.,GuangDong Research Institute Resources and Hydropower
Applied Mechanics and Materials | Year: 2013

Based on the one-dimensional constitutive relationship of unsaturated soils, this thesis has established the calculation model for embankment settlement with lateral deformation and without lateral deformation in accordance with the mechanic characteristics and in consideration of the influence of water environment. In addition, the thesis has provided the calculation methods for embankment settlement under various working situations (like under the situations of external load function, self-weight effect, increasing of the groundwater level, the invasion effect of rain water and the comprehensive effect of various working conditions) and used the settlement deformation results from the experiments of embankment models to check the calculation method. The method put forward in this thesis could not only be used in the calculation of the settlement deformation under load, but also could be used for the calculation of the deformation caused by the changes of water content in the embankment. © (2013) Trans Tech Publications, Switzerland.


Zhang Y.-C.,GuangDong Research Institute Resources and Hydropower | Yang G.-H.,GuangDong Research Institute Resources and Hydropower | Hu H.-Y.,Pearl River Water Resources Scientific Research Institute | Liu P.,Wuhan University
Applied Mechanics and Materials | Year: 2011

When strength reduction method is used for side slope analysis, only the intensive parameters are reduced and deformation parameters are not. The ideal elastoplastic model is adopted, and the safety factor is basically in agreement with that of the traditional limit equilibrium method. Main result is the safety factor of side slope, but non-linearity of soil is not considered actually during calculation, so it's hard to arrive at a real deformation field. Based on the deformation modulus elastoplasticity strength reduction method, research of this paper can achieve a more truthful deformation field. Considering the deficiencies in the current slip surface search techniques, this paper mainly studies how to determine the slip surface directly through the slope deformation field and stress field based on the analysis to their characteristics and the formation mechanism and characteristics of slip surface. Three methods to determine the slip surface are worked out: One is to use displacement gradient to identify the most disadvantageous slip surface; The second one is to determine the slip surface using the characteristics of FLAC calculation method and the characteristic that nodal velocity at non-slip area is near to zero and nodal velocity at slip area is very great; The last one is to use the deviation survey method in slope monitoring to track the nodal displacement in numerical analysis, and take the points with displacement catastrophe as those on the slip surface, and link those points to form a curve and finally get the critical slip surface. Analysis is made to the slip surface of clay slope with weak layer. Position of slip surface determined through these three methods is basically the same. Compared with traditional critical equilibrium method, these three methods can not only be applied to homogeneous side slope, but also be used to determine the slip surface of heterogeneous side slope. This paper makes a research on expansion of the application field of deformation modulus elastoplasticity strength reduction method. © (2011) Trans Tech Publications.


Zhang Y.C.,GuangDong Research Institute Resources and Hydropower | Zhang Y.C.,The Emergency Technology Research Cente of Guangdong Province for Public Events | Hu H.Y.,South China Agricultural University | Huzang Z.M.,South China Agricultural University
Advanced Materials Research | Year: 2014

Due to the characteristics of the physical mechanical properties of soft ground, reasonable foundation treatments are usually necessary before it meets the need of foundation deformation and load requirements. How to choose a reasonable foundation treatment method which has obvious virtues of economical expenditure and shorter construction period is an urgent problem emerging in engineering construction in the Pearl River Delta. While drainage sand well is used widely in soft soil foundation treatment in the Pearl River Delta. In this paper, a simplified calculation method is proposed to calculate the strength of soft soil foundation treated by sand well after drainage consolidation. © (2014) Trans Tech Publications, Switzerland.


Yang G.-H.,Guangdong Research Institute Resources and Hydropower | Yang G.-H.,South China University of Technology | Yang G.-H.,Guangdong Key Scientific Research Base of Hydraulic Engineering | Yang G.-H.,Wuhan University | And 5 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

Landslides are usually reinforced by anti-slide piles, and a very important problem is to determine the reasonable position of the anti-slide piles in the slope. It is considered that the optional position of the anti-slide piles is the position which can make the largest safety factor of the landslides. Based on the deformation field obtained by variable modulus of strength reduction method, this study finds that when the anti-slide piles setting in the position which has the largest displacement of the landslides can get the maximum safety factor, therefore, a reasonable location of the reinforcement by means of the anti-slide piles can be determined through the deformation field. The proposed method is convenient and reasonable. The results obtained can be a reference value to determine the location of the anti-slide piles.


Zhang Y.,Guangdong Research Institute Resources and Hydropower | Yang G.,Guangdong Research Institute Resources and Hydropower | Yang G.,Wuhan University | Hu H.,South China Agricultural University | And 4 more authors.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

According to some problems in the numerical model and safety criterion of the influence of blasting construction on buildings and structures, such as the complexity of load application in modeling process and considering the particle vibration velocity as safety criterion singly. The equivalent load application method and new safety criterion of blasting vibration are proposed based on Saint-Venant principle and pseudo-static method respectively, that is, applying the blasting load which is equivalent after acted on the blast hole wall to the line or surface of centers of the same blast hole row to simulate the blasting effects. and the rationality of them are verified through two practical cases. The results show that the equivalent load application method has some differences in the vicinity but better fit in further zone, and it is simple in modeling process and the convergence of calculation is fast. The natural frequency and emergency capacity of buildings and structures are considered in the new safety criterion of blasting vibration, which makes the influence of blasting vibration on buildings and structures can be evaluated reasonably. It can provide a reference for similar projects. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved.

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