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Effects of Different Cations on the Flocculation and Sedimentation of Static Fine-Grained

Journal of Environmental & Earth Sciences 2023年第2期5卷 1-14页

作者： Xiaomin Liu Yaotian Yang Rui wang Wenjuan wang Qiang Luo College of water conservancy and Civil Engineering Inner Mongolia Agricultural UniversityHohhotInner Mongolia010018China Collaborative Innovation center for Integrated Management of water Resources and water Environment in the Inner Mongolia Reaches of the yellow river HohhotInner Mongolia010018China Inner Mongolia JinHua Yuan Environmental Resource Engineering Consulting Co. ItdHohhotInner Mongolia010020China Wuhai Wuda District Agriculture of Animal Husbandry and water Affairs Bureau WuhaiInner Mongolia016000China yellow river hai bo-wan water conservancy project development center WuhaiInner Mongolia016000China

Natural water bodies mostly contain cations,and the type and content of these cations are the main factors affecting the flocculation of fine-grained cohesive sediments and the floc sedimentation rate at the interface between clear and turbid water.From the microscopic aspect,this study examined the changing patterns of porosity and the fractal dimension of the flocs of fine-grained cohesive sediments.Sedimentation experiments under different sediment contents and electrolyte conditions were conducted,and microscopic images of the flocs were analysed using Image-Pro Plus(IPP)and MATLAB based on the fractal theory.From the macroscopic aspect,this study experimentally investigated the flocculation and sedimentation of fine-grained cohesive sediments and proposed a sedimentation rate equation by introducing an ion concentration-related parameter into an existing sedimentation rate equation(stagnation zone)based on the adsorption isotherm equation.The equation proposed in this study was validated with measured data.The calculated values were in good agreement with the measured values,with a relative error of 16%.The findings of this study provide a reference for further research on the flocculation and sedimentation of fine-grained cohesive sediments in different water bodies.

关键词： Flocs Electrolyte Fractal dimension Porosity Sedimentation rate

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Pore Pressure Accumulation of Anisotropically Consolidated Soft Clay Subjected to Complex Loads Under Different Stress Paths

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China Ocean Engineering 2021年第3期35卷 465-474页

作者： wanG Yu-ke wan Yong-shuai RUAN Hang YU Xiang SHAO Jing-gan REN De-bo College of water conservancy Engineering Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China Collaborative Innovation center of water conservancy and Transportation Infrastructure Safety Zhengzhou 450001China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Henan Jiaoyuan Engineering Technology Co. LtdZhengzhou 450001China yellow river Yuanyang Bureau Yellow River Conservancy CommissionYuanyang 453500China

Owing to different influence factors of foundation soil,the initial stress state of the soil under various working conditions is complex.To simulate this situation,in this paper,a series of tests on undisturbed soft clay under pure principal stress axis rotation were carried out by using the hollow cylinder apparatus(HCA).The influence of initial consolidation angle ζ(the angle between the vertical direction and direction of the applied load in consolidation)and intermediate principal stress coefficient b on pore water pressure accumulation of undisturbed soft clay were mainly studied.The test results show that,during pure principal stress axis rotation,the pore water pressure accumulation of the undisturbed soft clay fluctuates and increases with the rotation of the major principal stress;the values of major principal stress anglesα,corresponding to the peak value of the pore water pressure in a certain cycle,are different with different initial consolidation angles;the pore water pressure accumulation of soft clay is greatly affected by the intermediate principal stress coefficient b.With the fixed initial consolidation angle ζ,the variation trend of the maximum pore water pressure for each cycle is appropriately the same with different b values.With the increase of cycles,the difference value of pore water pressure between b=0 and b=1 in each cycle increases gradually with different initial consolidation angles ζ.While with different initial consolidation anglesζ,the increase of the pore water pressure when b increases from 0 to 0.5 is different with that when b increases from 0.5 to 1;the variation of maximum pore water pressure withζis significantly affected by the value of b;the value of maximum pore water pressure increases with the cycle number increases under all test conditions,but the growth rate decreases gradually.And the variation of maximum pore water pressure with the cycle number N is obviously influenced by both ζ and b.

关键词： anisotropical consolidation pure principal stress rotation soft clay pore water pressure

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