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Chang X.,Zhejiang Water Conservancy and Hydropower College | Chengfa D.,Zhejiang Guangchuan Engineering Consulting Co.
Proceedings - 2nd IEEE International Conference on Advanced Computer Control, ICACC 2010 | Year: 2010

This paper deals with the application of least squares support vector regression (LS-SVR) with radial basis function (RBF) kernel in dam crack forecasting. In the process of LS-SVR, we performed the standard grid search and particle swarm optimization (PSO) to tune hyperparameters of LS-SVR. The results demonstrate that our PSO approach can identify optimal or near optimal parameters faster than the exhaustive grid search. Comparison with results from stepwise regression was also included, to evaluate the reliability of applying such a PSO method which avoids doing an exhaustive grid search. We found that our LS-SVR approach is promising in dam crack forecasting, however it cannot be used to extract the crack contributed by water pressure, temperature variation, and aging effect, respectively. © 2010 IEEE. Source


Shen Z.W.,Zhejiang Institute of Hydraulics and Estuary | Wang X.H.,Zhejiang Guangchuan Engineering Consulting Co. | Jin W.L.,Zhejiang Institute of Hydraulics and Estuary
Hydraulic Engineering II - Proceedings of the 2nd SREE Conference on Hydraulic Engineering, CHE 2013 | Year: 2014

In China, most of the offshore platform lied in the bohai sea, yellow sea and east China sea and south China sea, which is earthquake-prone area. Earthquake is devastating and unpredictable. It is important to assess the reliability of offshore jacket platforms subjected to seismic action. This paper presents the approach to calibrate of reliability of offshore jacket platform subjected to seismic action. The combination of loads are mainly investigated. The reliability of offshore jacket platform of QK18-1 in Bohai Bay related to 25-year reference period is 1.304, which is close to the conclusion of some existing researches. The results could provide significant reference for the design of offshore jacket platforms. © 2014 Taylor & Francis Group, London. Source


Liu Z.,University of Sichuan | Zheng Q.-W.,Zhejiang Guangchuan Engineering Consulting Co. | Wang C.,University of Sichuan | Wan L.,University of Sichuan
Electronic Journal of Geotechnical Engineering | Year: 2014

To study the creep properties of gravelly soil, undrained triaxial creep tests under different confining pressures and deviatoric stress levels were performed. The confining pressures ranged from 100 kPa to 400 kPa, and deviatoric stress levels ranged from 0.25 to 0.95. Results indicated that the instantaneous and creep deformations would evidently occur for gravelly soil. The creep process can be divided into attenuation and stable creep stages. The creep strain of gravelly soil increases with increasing confining pressure and deviatoric stress level. The strain rates of gravelly soil in stable creep stage were almost identical under different deviatoric stress levels. An empirical creep function, including three parameters, was presented to describe the stress level-axial strain-time behavior of gravelly soil. The axial strain-time behavior and stress level-axial strain behavior can be described by power functions. The parameters of the functions were determined. © 2015 ejge. Source


Wang X.-F.,Zhejiang Guangchuan Engineering Consulting Co.
Electronic Journal of Geotechnical Engineering | Year: 2013

In situ monitoring plays an important role in the construction organization as one part of the information on construction. In the study reported in this paper we used three different methods namely the hyperbolic method, exponent method and Asaoka method. These methods are used to analyze the effect of the foundation treatment to forecast the final settlement and calculate the average degree of consolidation of the foundation through the in situ observation of foundation treatment. The study was done as part of an airport expansion project. At the same time this paper proposed one simplified calculation model based on the measured settlement and the stage loading method by Zeng Guoxi then calculated the degree of consolidation. Finally this paper made comparison with the result of the modeling calculation and the average degree of consolidation. The results showed this modeling method is reasonably accurate and feasible. © 2013, EJGE. Source


Shen Z.W.,Zhejiang Institute of Hydraulics and Estuary | Wang X.H.,Zhejiang Guangchuan Engineering Consulting Co.
Advanced Materials Research | Year: 2014

Today to estimate the size of the rainfall on soil erosion comprehensive index is rainfall erosion force.This paper, by using routine weather stations rainfall data, such as the daily rainfall data of rainfall erosion force simplified model is set up, estimate rainfall erosion force, on the soil erosion quantitative forecast and science develop soil and water conservation measures is particularly important. © (2014) Trans Tech Publications, Switzerland. Source

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