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Evaluation of group effect of pile group under dragload embedded in clay

期刊名称：J.Cent.South.Techol.
时间：0
页码：503-512
语言：英文
分类：G4[文化科学—教育学;文化科学—教育技术学]
作者机构：[1]State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China, [2]Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China, [3]School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
相关基金：Supported by National Natural Science Foundation of China （No. 50679015）.
相关项目：海洋土的工程特性及其地基的变形机理研究

作者： Luan Mao-tian|Zheng Peng-yi|Yang Qing|Kong Gang-qiang|

中文摘要：

Some laboratory diffusion tests were conducted with diffusion device to determine the diffusion coefficient of Cr(Ⅵ) ion passing through Dalian red clay samples. The concentrations of Cr(Ⅵ) at different places of the samples were then measured spectrophotometrically after a standing time of 1 000 d. A one-dimensional solute transport equation was used to simulate the transport of Cr(Ⅵ) through clay samples. Back-calculation of diffusion coefficient of Cr(Ⅵ) was made with finite difference method. Parametric analysis was conducted to simulate variations in soil dry density, temperature, pH and standing time. The results show that the method used in this paper is simple and effective. The diffusion coefficient of Cr(Ⅵ) in Dalian red clay varies from 1.50×10-7 cm2/s to 2.08×10-7 cm2/s. After 1 000 d diffusion, the concentration of the source solution drops down to 1.27 mg/L from 62.5 mg/L, and the diffusion distance is only 3.5 cm. Under the assumption that diffusion coefficient is constant, the diffusion effect becomes more obvious with lower density, lower temperature, higher pH value, and much more time.

英文摘要：

Some laboratory diffusion tests were conducted with diffusion device to determine the diffusion coefficient of Cr（Ⅵ） ion passing through Dalian red clay samples. The concentrations of Cr（Ⅵ） at different places of the samples were then measured spectrophotometrically after a standing time of 1 000 d. A one-dimensional solute transport equation was used to simulate the transport of Cr（Ⅵ） through clay samples. Back-calculation of diffusion coefficient of Cr（Ⅵ） was made with finite difference method. Parametric analysis was conducted to simulate variations in soil dry density, temperature, pH and standing time. The results show that the method used in this paper is simple and effective. The diffusion coefficient of Cr（Ⅵ） in Dalian red clay varies from 1.50×10-7 cm2/s to 2.08×10-7 cm2/s. After 1 000 d diffusion, the concentration of the source solution drops down to 1.27 mg/L from 62.5 mg/L, and the diffusion distance is only 3.5 cm. Under the assumption that diffusion coefficient is constant, the diffusion effect becomes more obvious with lower density, lower temperature, higher pH value, and much more time.