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Liu Z.,Heilongjiang Institute of Technology | Liu F.,Northeast China Institute of Electrical Power Engineering | Zhao X.,Heilongjiang Provincial Hydraulic Research Institute
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2014

The digital image displacement measurement technology and finite element data smooth were applied in the soil slope shaking table test. The displacement field and strain field were obtained from the whole vibration process. And the seismic failure mode and failure mechanism were discussed as well. The results show the deformation of soil slope increases gradually; there is shear failure from slope middle to toe and tension-shear failure at the top of slope; there forms deep arc-shaped slip surface when the slope model fails. The generalized curvature of displacement time-history curve is used to judge whether the slope seismic failure is feasible. Source


Li S.,CAS Lanzhou Cold and Arid Regions Environmental and Engineering Research Institute | Lai Y.,CAS Lanzhou Cold and Arid Regions Environmental and Engineering Research Institute | Pei W.,CAS Lanzhou Cold and Arid Regions Environmental and Engineering Research Institute | Zhang S.,CAS Lanzhou Cold and Arid Regions Environmental and Engineering Research Institute | Zhong H.,Heilongjiang Provincial Hydraulic Research Institute
Natural Hazards | Year: 2014

Freeze-thaw action is a complex moisture-heat-mechanics interaction process, which has caused prevailing and severe damages to canals in seasonally frozen regions. Up to now, the detailed frost damage mechanism has not been well disclosed. To explore the freeze-thaw damage mechanism of the canal in cold regions, a numerical moisture-heat-mechanics model is established and corresponding computer program is written. Then, a representative canal in the northeast of China is taken as an example to simulate the freeze-thaw damage process. Meanwhile, the robustness of the numerical model and program is tested by some in situ data. Lastly, the numerical results show that there are dramatic water migration and redistribution in the seasonal freeze-thaw variation layer, causing repetitive frost heave and thaw settlement, and tension-compression stresses. Therefore, the strengths of soil are reduced after several freeze-thaw cycles. Further, the heavy denudation damage and downslope movement of the canal slope would be quite likely triggered in seasonally frozen regions. These zones should be monitored closely to ensure safe operation. As a preliminary study, the numerical model and results in this paper may be a reference for design, maintenance, and research on other canals in seasonally frozen regions. © 2014 Springer Science+Business Media Dordrecht. Source


Li X.,Harbin Institute of Technology | Ma X.,Harbin Institute of Technology | Zhang S.,Heilongjiang Provincial Hydraulic Research Institute | Zheng E.,Harbin Institute of Technology
Materials | Year: 2013

This paper presents workability, compressive strength and microstructure for geopolymer pastes and mortars made of class C fly ash at mass ratios of water-to-fly ash from 0.30 to 0.35. Fluidity was in the range of 145-173 mm for pastes and 131-136 mm for mortars. The highest strengths of paste and mortar were 58 MPa and 85 MPa when they were cured at 70 °C for 24 h. In XRD patterns, unreacted quartz and some reacted product were observed. SEM examination indicated that reacted product has formed and covered the unreacted particles in the paste and mortar that were consistent with their high strength. © 2013 by the authors. Source


Li S.,CAS Lanzhou Cold and Arid Regions Environmental and Engineering Research Institute | Zhang M.,CAS Lanzhou Cold and Arid Regions Environmental and Engineering Research Institute | Tian Y.,Northwest Research Institute Co. | Pei W.,Northwest Research Institute Co. | Zhong H.,Heilongjiang Provincial Hydraulic Research Institute
Cold Regions Science and Technology | Year: 2015

Frost action is a prevailing and heavy damage to canals in cold regions, and it involves complicated heat and mass transfer as well as frost deformation in the seasonal freeze-thaw ground. To explore the frost damage mechanisms of canals in cold regions, firstly, a numerical water-heat-mechanics model is set up and corresponding computer program is developed. Secondly, a model test on a canal is carried out in one freezing-thawing cycle. Then, the canal model is simulated to analyze its temperature, water and mechanical states during the freezing-thawing process. The results show that under the drive of temperature, the total water contents in freezing-thawing fronts are very high and even a part of the freezing front is filled with ice and unfrozen water, which causes high tensile stress and heavy frost heave. In particular, the deformations at the toe of the canal slope are much larger than those in other zones. Therefore, this zone should be monitored closely to ensure safe operation. As a preliminary study, the experimental and numerical model and results in this study may be a reference for design, maintenance and research on other canals in cold regions. © 2015 Elsevier B.V. Source


Liu Z.-P.,Heilongjiang Institute of Technology | Liu Z.-P.,Dalian University of Technology | Chi S.-C.,Dalian University of Technology | Zhao X.-B.,Heilongjiang Provincial Hydraulic Research Institute | Jia Y.-F.,Dalian University of Technology
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2015

Whether or not the dynamic parameters of earth rockfill determined in the laboratory or in situ are corresponding to the reality is a matter of concern. A back-analysis approach for the dynamic parameters of earth-rockfill based on response spectra and acceleration peak is presented. According to the acceleration response information of Liyutan Dam in the Chi-Chi earthquake, and by applying the back-calculation approach, the dynamic parameters are obtained. The results demonstrate that the proposed method is feasible, and the computational accuracy basically satisfies the practical engineering requirements. The dynamic shear modulus coefficient K of the dam materials obtained from the laboratory dynamic triaxial tests is small and should be revised. ©, 2015, Chinese Society of Civil Engineering. All right reserved. Source

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