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Effect of Progressive Substitution of Cement and Lime by Powdered Shells Used as a Curing Agent for Dredged Soil in a Port Area

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Journal of Wuhan university of Technology(Materials Science) 2025年第1期40卷 88-102页

作者： SUN Yang WANG Faxin SU Yaying LI Yiwei HE Feng college of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China Huai'an Research Institute Hohai UniversityHuai'an 223025China Jiangsu Fangyang Industrial Investment Corp.Ltd. Lianyungang 210098China

This study aimed to address the challenges of solid waste utilization,cost reduction,and carbon reduction in the treatment of deep-dredged soil at Xuwei Port in Lianyungang city of *** research in this area was ***,a curing agent made from powdered shells was used to solidify the dredged soil in *** employed laboratory orthogonal tests to investigate the physical and mechanical properties of the powdered shell-based curing *** was collected by conducting experiments to assess the role of powdered shells in the curing process and to determine the optimal ratios of powdered shells to solidified soil for different *** development of strength in solidified soil was studied in both seawater and pure water *** study revealed that the strength of the solidified soil was influenced by the substitution rate of powdered shells and their interaction with *** cement content had a positive effect on *** high-strength solidified soil,the recommended ratio of wet soil:cement:lime:powdered shells were 100:16:4:4,while for low-strength solidified soil,the recommended ratio was 100:5.4:2.4:***,under appropriate conditions,improved short-term strength by promoting the formation of expansive ettringite minerals that contributed to cementation and *** findings suggest that the combination of cement and powdered shells is synergistic,positively affecting the strength of solidified *** recommended ratios provide practical guidance for achieving desired strength levels while considering factors such as cost and carbon *** role of seawater in enhancing short-term strength through crystal formation is noteworthy and can be advantageous for certain *** conclusion,this research demonstrates the potential of using a powdered shell-based curing agent for solidifying dredged soil in an environmentally friendly and cost-effective *** recommended ratios for different str

关键词： carbon reduction and solidification dredged soil abandoned shells orthogonal test chemical additives(lime and cement) unconfined compressive strength(UCS)

Discrete Numerical Study on Type II Fracture of Partially Detached Concrete Panels in Cold Region

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Structural Durability & Health Monitoring 2025年第1期19卷 167-191页

作者： Huayi Zhang Maobin Song Lei Shen Nizar Faisal Alkayem Maosen Cao college of Water Conservancy and Hydropower engineering Hohai UniversityNanjing210024China Haihe River Huaihe River and Xiaoqinghe River Basin Water Conservancy Management and Service Center of Shandong ProvinceJinan250100China college of Mechanics and engineering Science Hohai UniversityNanjing211100China

When the upper chord beam of the beam-string structure(BSS)is made of concrete-ﬁlled steel tube(CFST),its overall stiffness will change greatly with the construction of concrete placement,which will have an impact on the design of the tensioning plans and selection of control measures for the *** order to accurately obtain the bending stiffness of CFST beam and clarify its impact on the mechanical properties of composite BSS during con-struction,the inﬂuence of some factors such as height-width ratio,wall thickness of steel tube,elasticity modulus of concrete,and friction coefﬁcient on the bending stiffness are analyzed parametrically by the numerical simula-tion technology based on an actual *** calculation formula of the equivalent bending stiffness of CFST is also established through mathematical statistical ***,the equivalent bending stiffness is introduced into the construction and use stages of the composite BSS,respectively,and the mechanical properties such as prestress-tensioning control value,structural deformation,and internal force of key members are comparatively analyzed when adopting two different construction ***,the optimal construction plan of concrete placementﬁrst and then prestress-tensioning is proposed.

关键词： Beam-string structure(BSS) concrete-ﬁlled steel tube(CFST) bending stiffness timing of concrete placement prestress-tensioning

Estimation of Chloride Diffusivity in Hydrated Tricalcium Silicate Using a Hydration-Diffusion Integrated Method

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Journal of Wuhan university of Technology(Materials Science) 2025年第1期 49-64页

作者：汪鑫 SHEN Dejian TAO Sijie LIU Ruixin WU Shengxing college of Civil and Transportation engineering Hohai University

This study aims to develop a chloride diffusion simulation method that considers the hydration microstructure and pore solution properties during the hydration of tricalcium silicate （C3S）.The method combines the hydration simulation,thermodynamic calculation,and finite element analysis to examine the effects of pore solution,including effect of electrochemical potential,effect of chemical activity,and effect of mechanical interactions between ions,on the chloride effective diffusion coefficient of hydrated C3S *** results indicate that the effect of electrochemical potential on chloride diffusion becomes stronger with increasing hydration age due to the increase in the content of hydrated calcium silicate;as the hydration age increases,the effect of chemical activity on chloride diffusion weakens when the number of diffusible elements decreases;the effect of mechanical interactions between ions on chloride diffusion decreases with the increase of hydration age.

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Stability analysis of cut-fill and deep patch unsaturated slopes under steady infiltration conditions

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Science China Technological Sciences 2025年第1期 356-367页

作者： Fei ZHANG Shilin JIA Yufeng GAO Key Laboratory of the Ministry of Education for Geomechanics and Embankment engineering College of Civil and Transportation EngineeringHohai University

Cut-fill slopes, as an economical solution in mountainous road construction, are typically jeopardized by cracks and rainfall. Deep patch repair with geosynthetics is an effective technique to mitigate these issues. This paper proposes an upperbound analytical framework for evaluating the stability of cracked cut-fill slopes and deep patch slopes under one-dimensional steady infiltration. The proposed framework is employed to investigate suction-induced effects on slope stability and critical failure surface through a series of parametric analyses. The findings indicate that the suction-induced effect generally increases with air-entry pressure and approaches a constant value. The stability of a cracked cut-fill slope can be enhanced by deep patch repair with geosynthetics. Increasing the deep patch depth enhances local stability and reduces the required reinforcement strength. Generally, the depth of the deep patch should be greater than the crack depth to avoid local failures. Furthermore, a design method involving both local and global stability for deep patch slopes is presented, along with a design example for illustration.

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Effect of Progressive Substitution of Cement and Lime by Powdered Shells Used as a Curing Agent for Dredged Soil in a Port Area

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Journal of Wuhan university of Technology(Materials Science) 2025年第1期 88-102页

作者：孙阳 WANG Faxin SU Yaying LI Yiwei HE Feng college of Harbour Coastal and Offshore Engineering Hohai University Huai'an Research Institute Hohai University Jiangsu Fangyang Industrial Investment Corp. Ltd.

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Location privacy protection of maritime mobile terminals

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Digital Communications and Networks 2022年第6期8卷 932-941页

作者： Xin Su Su Jiang Dongmin Choi college of iot engineering Hohai UniversityChangzhou213022China Division of Undeclared Majors Chosun UniversityRepublic of Korea

Mobile Edge Computing(MEC)can support various high-reliability and low-delay applications in Maritime Networks(MNs).However,security risks in computing task offloading *** this study,the location privacy leakage risk of Maritime Mobile Terminals(MMTs)is quantified during task offloading and relevant Location Privacy Protection(LPP)schemes of MMT are considered under two kinds of task offloading *** single-MMT and single-time offloading scenario,a dynamic cache and spatial cloaking-based LPP(DS-CLP)algorithm is proposed;and under the multi-MMTs and multi-time offloading scenario,a pseudonym and alterable silent period-based LPP(PA-SLP)strategy is *** results show that the DS-CLP can save the response time and communication cost compared with traditional algorithms while protecting the MMT location ***,extending the alterable silent period,increasing the number of MMTs in the maritime area or improving the pseudonym update probability can enhance the LPP effect of MMTs in ***,the study results can be effectively applied to MNs with poor communication environments and relatively insufficient computing resources.

关键词： Location privacy protection Maritime network Mobile edge computing Task floading

Interface wave propagation characteristics of liquid-immersed porous cylinder

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Chinese Journal of Acoustics 2018年第2期37卷 177-190页

作者： HAN Qingbang XU Zhouchen TONG Ziwei QI Lihua WANG Peng SHAN Minglei ZHU Changping college of iot engineering of hohai university

This paper devotes to investigate the propagation characteristics of the interface wave on the liquid-immersed porous cylinder, and special emphasis is paid on the dependence of the dispersion relation on the porous media parameters. A model of liquid-immersed porous cylinder is established theoretically. Based on the elastic-dynamic theory of liquid-saturated porous solid and wave theory, the dispersion curves and transient response of open-pores and sealed-pores are simulated numerically, and their dependence on the cylinder radius and porous medium parameters are analyzed. The results show that the Stoneley-Scholte wave can be clearly distinguished with other waves in the time domain, and the Stoneley-Scholte wave dispersion relates intimately with the porosity of the porous medium and cylinder radius, whilst the permeability of the media has little effect on the dispersion property.

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Effect of the amplification factor on seismic stability of expanded municipal solid waste landfills using the pseudo-dynamic method

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Journal of Zhejiang university-Science A(Applied Physics & engineering) 2013年第10期14卷 731-738页

作者： Xiao-bo RUAN Shu-lin SUN Wen-liang LIU college of Civil and Transportation engineering Hohai University college of Earth Sciences and engineering Hohai University

The evaluation of the seismic stability of an expanded municipal solid waste(MSW) landfill is very important in seismic prone *** this paper,the pseudo-dynamic method was used to calculate the average safety factor for the expanded landfill with a trapezoidal berm based on under-berm failure ***,the effects of the variation of parameters such as the amplification factor,seismic coefficient,height of berm,angle of back slope of berm,and depth of waste mass at the back slope on the seismic stability of the landfill were *** results indicated that the influences of the vertical seismic coefficient,height of berm,and angle of the back slope of the berm on the seismic stability of the landfill are weakened as the amplification factor increases,but the influence of the horizontal seismic coefficient on the seismic stability of the landfill is *** the other hand,a certain ratio of the height of the waste mass above the back slope to the depth of waste mass at the back slope,or the reasonable consideration of the magnitude of the amplification factor will be conducive to the seismic design of the *** addition,the results obtained by the pseudo-static and pseudo-dynamic methods were compared.

关键词： Seismic stability Expanded landfill Under-berm failure Pseudo-dynamic method Amplification factor

Risk analysis for a cascade reservoir system using the brittle risk entropy method

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Science China(Technological Sciences) 2016年第6期59卷 882-887页

作者： YANG Yin REN Qing Wen TIAN Ying XIONG Yao college of Hydraulic Conservation and Hydropower engineering Hohai University Department of engineering Mechanics Hohai University

The principal means of conserving water and utilizing hydropower in China is to exploit the use of a series of reservoirs in a cascade. This method and its inherent engineering safety problems are receiving increasing attention nowadays. In the field of engineering safety analysis, much work has focused on single reservoir projects in the past few years, but there is little research available on the safety risk analysis of cascade reservoirs, either within China or internationally. Therefore, a framework for risk analysis on the cascade reservoir system based on the theory of system engineering is constructed in this article. A cascading failure model is established and the connection degree factor discussed. In addition, the importance degree of the subsystem, which can be calculated by combining the analytical hierarchy process and the entropy weight method, is explained. According to brittleness theory of a complex system, brittle risk entropy is proposed as a performance index for measuring the collapse uncertainty of the cascade reservoir system. In addition, the brittle risk of the cascade reservoir system is predicted, which provides a reference for safety analysis in water conservation and hydropower construction projects in China.

关键词： cascading failure model safety analysis risk assessment complex system brittle risk entropy