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Qi L.,Shandong Electrical Power Engineering Consulting Institute Co. | Shi J.-Y.,Hohai University | Hou Q.,Shandong Survey and Design Institute of Water Conservancy
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

As an important part of load transfer behavior and settlement, the research for pile penetration into cushion would improve and perfect the theory of composite ground. There are only few studies of penetration. We analyze the shortcomings of existent calculating methods for penetration, and obtain the more rational method. Finally, this method is compared with the existent methods and model experimental results; it is shown that this method is reasonable and feasible. Source

Jiang H.,Shandong Electrical Power Engineering Consulting Institute Co. | Wang R.,CAS Wuhan Institute of Rock and Soil Mechanics | Lu Y.,CAS Wuhan Institute of Rock and Soil Mechanics | Meng Q.,CAS Wuhan Institute of Rock and Soil Mechanics
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2010

Calcareous sand is a special marine geomaterial medium, which has unexpected physico-mechanical properties due to its origin and fabric. The traditional practice, successfully used for other types of materials, is proved to be ineffective when used for pile foundations driven into calcareous sands. Model pile tests are carried out in a cylindrical testing chamber to investigate the bearing and deformation characteristics of pile groups in calcareous sands, which are taken from the Yongshu coral reefs in Nansha Islands in South China Sea. In contrast to the tests with silica sands, it is shown that calcareous sands behave in a completely different manner than silica sands due to grain crushing. Relative density has effect on the bearing capacity of pile group in calcareous, and the bearing capacity of close-ended pile group is 17%-20% larger than that of open-ended pile group, but it is less than that in silica sands. The axial force of pile group in calcareous sands has a slow decay rate, and the ultimate shaft friction of pile group in calcareous sands is only 21%-30% of that in silica sands, which is effected by depth, and it is very sensitive to density in silica sands but less in calcareous sands. In addition, when Dr = 46% and 75%, the bearing efficiency of pile group in calcareous sands is less than 1, and it increases with relative density, which is completely different from silica sands. The conclusion drawn from the study can provide valuable references for the practice. Source

Li J.,Shandong Electrical Power Engineering Consulting Institute Co.
Advances in Science and Technology of Water Resources | Year: 2013

In order to study the durability of concrete piles in a corrosive groundwater environment, concrete corrosion resistant test of pile foundation in the environments with Cl- and SO4 2- coexistance and with only SO4 2- existance was performed, according to medium-highy corrosive groundwater geological conditions of a large power plant in Shandong. The results show that in the Cl- and SO4 2-coexistence groundwater environment, sulfate attack concrete situation is slightly lower than in the presence of SO4 2-only environment, the conventional doped preservatives does not significantly increase corrosion resistance, and resistance to sulfur cement and sulphate resistance of ordinary Portland cement remain close, but resistance to chloride ion invasive can not meet durability requirements. Finally, the ordinary Portland cement and admixture with low water-cement ratio, high-performance concrete pile can be used to meet durability requirements. Source

Wang C.-C.,Beijing University of Civil Engineering and Architecture | Zhang Y.-Q.,Beijing University of Civil Engineering and Architecture | Zhu T.,Beijing University of Civil Engineering and Architecture | Zhang X.-Y.,Shandong Electrical Power Engineering Consulting Institute Co. | And 2 more authors.
Polyhedron | Year: 2015

Four novel coordination compounds based on d10 metals, 1,10-phenanthroline (phen) and 2,2′,3,3′-oxydiphthalic acid (2,2′,3,3′-odpt), 3,5-di(3,4-dicarboxylphenyloxy)benzoic acid (dcpb) or 1,3-(3′,4′-carboxylphenoxy)benzene (cpb), namely [Co2(phen)4(2,2′,3,3′-H2odpt)2]·14H2O (1), [Co2(phen)4(H4dcpb)2]·14H2O (2), [Cu(phen)(H3dcpb)] (3) and [Mn(phen)2(H2cpb)] (4), have been synthesized under hydrothermal conditions and characterized by the methods of single crystal X-ray diffraction, FTIR, elemental analysis and UV-Vis diffuse spectroscopy. The isostructural compounds 1 and 2 consist of discrete neutral [Co2(phen)4(L)2] (L = 2,2′,3,3′-odpt for 1 and dcpb for 2) units and lattice water molecules, forming 3D frameworks with the aid of rich hydrogen bonding interactions. Compounds 3 is built up of discrete neutral [Cu(phen)(H3dcpb)] units to construct a 3D framework via π-π stacking interactions. Compound 4 consists of 1D neutral [Mn(phen)2(H2cpb)] helix chains, further forming a 3D framework via rich hydrogen bonding interactions. The photocatalytic activities of degradation of methylene blue (MB) and methyl orange (MO) in compounds 1-4 under UV light irradiation were determined, and the results revealed that compound 4 can decompose MB and MO efficiently. The different degradation efficiencies of compounds 1-4 implied that the HOMO-LUMO gap should be utilized to describe the discrete character of the light-induced transitions in the coordination compounds. © 2015 Elsevier Ltd. All rights reserved. Source

Wang K.-X.,Shandong University of Technology | Wang K.-X.,Linyi power supply company | Zhu C.,Dezhou Power Supply Company | Sun J.-J.,Shandong Electrical Power Engineering Consulting Institute Co. | Chen P.,Shandong University of Technology
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2012

For transmission lines, the paper analyzes the wave propagation process and the wave's refraction and reflection phenomena after the failure. On this basis, the paper proposes fault location method combining two traveling waves' theories. First, single-ended location principle is used to give preliminary fault location. And then the accurate results are given by single-ended principles combining with initial wave arrival time difference at both ends. The advantage of this method is that the results are obtained by single-ended location principle, eliminating the line length's error and the influence on location accuracy from circuit accurate time synchronization on both sides in double-ended principle location method so as to improve the accuracy and reliability of location. ATP simulations show that the combined traveling wave fault location scheme of transmission lines is feasible and fault location accuracy is improved obviously. Source

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