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Mo H.,South China University of Technology | Yang C.,South China University of Technology | Yang C.,Guangzhou Municipal Engineering Design & Research Institute | Chen J.,South China University of Technology | Chen L.,South China University of Technology
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2016

Three-factor at three-level orthogonal array experimental method was used to conduct multifactor system analysis with finite element method (FEM) program based on the Xijiang River Water Diversion Project in Guangzhou. The influential laws of segment opening and material cost caused by the number of ring beam, the embedded depth of diaphragm wall and the thickness of ring beam were explored as well as the reasonable supporting system was proposed for shield construction when tunnels followed by well excavation. A theoretical calculation method for segment opening was raised based on double-sided elastic foundation beam, which proved the rationality of the orthogonal model. The results show that the reasonable supporting system is more scientific and reasonable than that determined by traditional experience analogy method. © 2016, Central South University of Technology. All right reserved. Source

Liu P.-M.,Central South University | Liu P.-M.,Guangzhou Municipal Engineering Design & Research Institute | Liu J.-X.,Central South University | Tong X.-Z.,Central South University
Wutan Huatan Jisuan Jishu | Year: 2013

The use of parallel technology can improve the efficiency in the magnetotelluric data processing. Partial derivative matrix calculation occupy the large amount of computing time and make the inversion slow. This article propose for the objective function to use the regularization inversion method based on the damping Gauss-Newton method, and to use parallel calculation to partial derivatives and the remaining part of the reservation serial computing model. The equivalence parallel strategy are adopted among the different frequency. Simulating the multi-process parallel computing speed through two theoretical models, the results show that the correctness of the algorithm and efficiency and stability. Source

Liu A.-R.,Guangzhou University | Wang H.-L.,Guangzhou Municipal Engineering Design & Research Institute | Yu Q.-C.,Guangzhou University | Zhang J.-P.,Guangzhou University
Gongcheng Lixue/Engineering Mechanics | Year: 2013

Based on energy analysis method, the calculation formula of lateral buckling critical load of the leaning-type arch ribs with the catenary arch axis is derived. Compared with the results obtained from FEM, the analytical solution formula presented is verified in this paper. The applicability of the lateral and radial mechanical models of transverse brace between the main arch rib and stable arch rib proposed are validated. Furthermore, the lateral buckling critical load under circular arch axis and catenary are compared, while the quantity relationship and the applicable condition that replacing the lateral buckling critical load of catenary arch with the circular arch are analyzed. It is shown that the line-type of arch axis has a certain extent impact on the lateral buckling critical load of the leaning-type arch ribs. When the incline angle of stable ribs is small, the difference of the lateral buckling critical load between the catenary arch rib system and circular arch rib system is less than 5%. The error induced by the lateral buckling critical load of circular arch rib system replacing that of the catenary arch rib system will be less than 10% when the rise-span ratios are small enough. With the increasing of rise-span ratios, the differences will increase and the replacement is not feasible. Source

Liu C.,Beijing University of Technology | Liu C.,Guangzhou Municipal Engineering Design & Research Institute | Liu C.,Recovery Water | Zhou Y.,Beijing University of Technology | And 4 more authors.
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2015

There is an underlying assumption that run-off and rainfall in a given urban catchment are equivalent and, further, to use design rainfall depth as a proxy for run-off in hydrological analyses and calculations. However, when employing this approach, it is difficult to accurately and fully reflect the variability in rainfall characteristics. To address this issue, a method for the copula-based multivariate frequency analysis of rainfall characteristics was proposed by using historical rainfall data (1961-2012) from Guangzhou city. First, continuous rainfall time series were divided into individual rainfall events using the rainfall intensity method. Then the characteristic variables of rainfall were calculated by sampling using the annual maximum method. Finally, a three-dimensional copula was introduced to build a multivariate joint probability distribution model of rainfall characteristics. The results show that the copula-based multivariate analysis is easy to implement and provides reliable results. This approach can be used to analyse the conditional probabilities of variables for different orders of magnitude. It can fully reflect rainfall characteristics, which serve an important reference for urban flood control and drainage planning. ©, 2015, Harbin Institute of Technology. All right reserved. Source

Liu Z.-L.,Beijing University of Technology | Liu Z.-L.,Recovery Water | Zhou Y.-W.,Beijing University of Technology | Zhou Y.-W.,Recovery Water | And 2 more authors.
Beijing Gongye Daxue Xuebao/Journal of Beijing University of Technology | Year: 2015

To apply the wastewater modeling techniques to hydraulic condition analysis in a sewage pipe network system, the diurnal patterns of nodal flow, as an important input condition, was analyzed in this paper. Combined with the practical experience and statistical theory, detailed analysis procedures and methods were provided, which included the selection of service area monitoring nodes, removal of singular point in monitoring flow series, the frequency distribution fitting and testing for dimensionless coefficients of flow variation and the uncertainty expression of diurnal variation patterns. With the Guangzhou case study, five types of diurnal patterns for single service node were proposed. Through contrast with the same types of research results in China and abroad, the suitability of analysis results had been verified. ©, 2015, Beijing University of Technology. All right reserved. Source

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