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Numerical simulation of dynamic pore pressure in asphalt pavement 被引量:7
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作者 崔新壮 金青 +1 位作者 商庆森 翟继光 《Journal of Southeast University(English Edition)》 EI CAS 2009年第1期79-82,共4页
For studying the driving role of dynamic pressure in water-induced damage of asphalt pavement, based on the fast Lagrangian finite difference method and Biot dynamic consolidation theory, fluid-solid coupling analysis... For studying the driving role of dynamic pressure in water-induced damage of asphalt pavement, based on the fast Lagrangian finite difference method and Biot dynamic consolidation theory, fluid-solid coupling analysis of the pavement is conducted considering asphalt mixtures as porous media. Results reveal that the development and dissipation of the dynamic pore pressure are coinstantaneous and this makes both the positive and negative dynamic pore pressure and seepage force alternate with time. Repetitive hydrodynamic pumping and sucking during moisture damage is proved. The dynamic pore pressure increases with vehicle velocity. Effective stress and deflection of pavement decrease due to the dynamic pore water pressure. However, the emulsification and replacement of the asphalt membrane by water are accelerated. The maximum dynamic pore pressure occurs at the bottom of the surface course. So it is suggested that a drain course should be set up to change the draining condition from single-sided drain to a two-sided drain, and thus moisture damage can be effectively limited. 展开更多
关键词 road engineering asphalt pavement moisture damage dynamic pore pressure seepage force dynamic deflection
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Characteristics of Saturated Soft Clay in Dynamic Deformation
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作者 Jiang Kaihui Yao Minglun Lecturer, Tianjin University, Tianjin, 300072 Professor, Tianjin University, Tianjin, 300072 《China Ocean Engineering》 SCIE EI 1994年第1期87-94,共8页
-This paper presents the research results of dynamic pore water pressure and the characteristics of dynamic deformation of saturated soft clay and the factors affecting the dynamic pore water pressure and dynamic defo... -This paper presents the research results of dynamic pore water pressure and the characteristics of dynamic deformation of saturated soft clay and the factors affecting the dynamic pore water pressure and dynamic deformation. Dynamic triaxial compression tests are carried out and the soil samples used in the tests are remoulded clay from the seabed of the Bohai Bay. The paper also deals with the dynamic deformation mechanism of saturated soft clay foundation without drain. A calculation model for permanent dynamic deformation of saturated soft clay foundation has been established. 展开更多
关键词 soft clay dynamic pore water pressure dynamic deformation dynamic load pore water pressure
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Analysis of Dynamic Stability of Ocean Gravity Structure Foundations
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作者 He Guangna and Cao Yalin Professor, Dalian University of Technology, Dalian 116024 . Former Postgruate Student, Dalian University of Technology, Dalian 116024 《China Ocean Engineering》 SCIE EI 1995年第2期183-192,共10页
Based on unified equivalent harmonic loading on seabed foundation and energy approach suggested by the authors, the development of dynamic pore water pressure and stability of soil foundation for the vibration of ocea... Based on unified equivalent harmonic loading on seabed foundation and energy approach suggested by the authors, the development of dynamic pore water pressure and stability of soil foundation for the vibration of ocean gravity structures excited by random wave loading are analysed. It may be seen that the present method for the study of dynamic problems of ocean gravity structure soil foundations is more reasonable and convenient. 展开更多
关键词 ocean gravity structure foundation dynamic pore water pressure dynamic stability unified equi- valent harmonic loading energy approach
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Numerical Analyses of Caisson Breakwaters on Soft Foundations Under Wave Cyclic Loading 被引量:5
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作者 王元战 焉振 王禹迟 《China Ocean Engineering》 SCIE EI CSCD 2016年第1期1-18,共18页
A caisson breakwater is built on soft foundations after replacing the upper soft layer with sand. This paper presents a dynamic finite element method to investigate the strength degradation and associated pore pressur... A caisson breakwater is built on soft foundations after replacing the upper soft layer with sand. This paper presents a dynamic finite element method to investigate the strength degradation and associated pore pressure development of the intercalated soft layer under wave cyclic loading. By combining the undrained shear strength with the empirical formula of overconsolidation clay produced by unloading and the development model of pore pressure, the dynamic degradation law that describes the undrained shear strength as a function of cycle number and stress level is derived. Based on the proposed dynamic degradation law and M-C yield criterion, a dynamic finite element method is numerically implemented to predict changes in undrained shear strength of the intercalated soft layer by using the general-purpose FEM software ABAQUS, and the accuracy of the method is verified. The effects of cycle number and amplitude of the wave force on the degradation of the undrained shear strength of the intercalated soft layer and the associated excess pore pressure response are investigated by analyzing an overall distribution and three typical sections underneath the breakwater. By comparing the undrained shear strength distributions obtained by the static method and the quasi-static method with the undrained shear strength distributions obtained by the dynamic finite element method in the three typical sections, the superiority of the dynamic finite element method in predicting changes in undrained shear strength is demonstrated. 展开更多
关键词 soft layer strength degradation pore pressure development wave cyclic loading dynamic finite element method
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