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Sun L.M.,North China University of Water Conservancy and Electric Power | Liu X.,Chengdu Engineering Corporation Ltd | Zhang Z.R.,China Railway Siyuan Survey and Design Group Co.
Applied Mechanics and Materials | Year: 2013

According to the tested physical and mechanical soil parameters of the Coastal Railway in West Guangdong along the broad coastal plain region, the correlation relations between compression modulus, compression coefficient and void ratio, moisture content, density, standard penetration number are analyzed by the linear regression method. The results show that the compression modulus increases with the increase of water content and void ratio, with correlation coefficients being 0.6985 and 0.8147, respectively; the compression modulus decreases with the increase of density and standard penetration number, with correlation coefficients being 0.7827 and 0.4934, respectively; the compression coefficient decreases with the increase of water content and void ratio, with correlation coefficients being 0.9131 and 0.9412, respectively; the compression coefficient decreases with the increase of density and standard penetration number, with correlation coefficients being 0.8187 and 0.4985, respectively. The parameters which are hardly obtained from the test directly can be easily evaluated by using these formulas. © (2013) Trans Tech Publications, Switzerland. Source

Zhang X.,North China University of Water Conservancy and Electric Power | Peng X.,North China University of Water Conservancy and Electric Power | Fan R.,Chengdu Engineering Corporation Ltd
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2013

The check dam system planning is a typical multi-criteria decision problem of complex system since the factors such as water and sediment control capacity, intercepting sediment capacity, silting land capacity and investment return and so on should be taken into account. The multi-criteria decision making of complex system usually has fuzziness and uncertainty. By making use of the advantage of catastrophe theory in dealing with the fuzzy and gray problems, an indicator system for evaluating check dam system planning was put forward, and a mathematical model was established to optimize the planning based on the mutation classification evaluation method, and then a detailed procedure was described to apply the model. The method has been applied to optimize the planning of check dam system in Liujian River, basin of Yanshi City. Firstly, all the indexes of bottom level were made dimensionless and normalized, and then the importance of each indicator was quantified by aggregation mechanism of the normalized formula; Finally, the optimum planning could be obtained by comparing total value of mutation subjection function of each planning. The total values of mutation subjection function of planning I, II and III are 0.9592, 0.9181 and 0.9484 respectively, thus planning I is optimal. This result is consistent with that derived from the traditional method, suggesting the mutation model is reasonable and feasible for check dam system planning optimization. Source

Zheng H.-C.,University of Sichuan | Deng J.-H.,University of Sichuan | Hu W.-Y.,Chengdu Engineering Corporation Ltd | Cui Y.-L.,University of Sichuan | Zhou Y.-F.,University of Sichuan
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

On the basis of analyzing the actual engineering data and the limitation of existing instability models, a new conceptual artesian water model of reservoir bank slope is proposed. The conditions pertinent to artesian water model are given. Theoretical calculation formulae for artesian water pressure at the bottom of the sliding zone and for factor of safety of reservoir bank slope are deduced respectively considering the artesian water. It is verified that the existence of artesian water is reasonable. The influence of rainfall infiltration and water level fluctuation on the stability of bank slope is significant by considering the artesian water. The combined effect of these two factors is greater than the simple superimposed effect of single factor respective action. The stability of artesian water slope is the lowest when the infiltration ratio belongs to the range of (10-5, 10-2). The slope is prone to slide when the factor of safety reaches the minimum value. With the same infiltration ratio, the larger the rainfall infiltration is, the lower the landslide stability is. ©, 2015, Academia Sinica. All right reserved. Source

Guo Q.,University of Sichuan | Pei L.,University of Sichuan | Zhou Z.,Chengdu Engineering Corporation Ltd | Chen J.,University of Sichuan | Yao F.,Dadu River Hydropower Development Co.
Computers and Geotechnics | Year: 2016

High core rockfill dams exhibit complex deformation mechanisms because of complicated geological conditions, many material partitions and severe weather conditions. When realistic parameters cannot be obtained through laboratory tests or engineering analogies because of effects of size or time, back analysis is necessary to predict deformation characteristics. This paper proposes a method of deformation back analysis based on the response surface method and genetic optimization theory. The parameters of the creep and Duncan-Chang models for the Pubugou gravelly soil core rockfill dam are sequentially calculated. Back analysis performed using this method efficiently yields more precise results than those obtained from laboratory-determined parameters. © 2016 Elsevier Ltd. Source

Xiao Y.,Hohai University | Zhou S.,Hohai University | Lou X.,Chengdu Engineering Corporation Ltd
ICCREM 2015 - Environment and the Sustainable Building - Proceedings of the 2015 International Conference on Construction and Real Estate Management | Year: 2015

Currently the organizational project management capacity in EPC project has become more and more concerned. The focus of the project management capacity is about a dynamic process that improves the organization and coordination, and enhances the scientific and standardized degree in project management. Evaluation of project management is the foundation for improving the project management capabilities for organization. The project management maturity model (PMMM) is proposed in this context to evaluation project management maturity of the hydropower EPC contractor. By the PMMM and combining with the specific characteristics and the current study situation hydropower project management at home and abroad, here we built a maturity framework and the evaluation system for hydropower EPC contractor on project management. And propose the evaluation method based on gray comprehensive evaluation. The empirical analysis of the EPC contract practices in SOPLADORA hydropower project shows that it is feasible and effective to analyze the maturity of the management. © 2015 ASCE. Source

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