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Study on Failure Mechanism and Bearing Capacity of Three-Dimensional Rectangular Footing Subjected to Combined Loading 被引量:8
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作者 张其一 栾茂田 王忠涛 《China Ocean Engineering》 SCIE EI 2008年第2期313-330,共18页
This paper presents two kinematic failure mechanisms of threc-dimensional rectangular footing resting on homogeneous undrained clay foundation under uniaxial vertical loading and uniaxial moment loading. The failure m... This paper presents two kinematic failure mechanisms of threc-dimensional rectangular footing resting on homogeneous undrained clay foundation under uniaxial vertical loading and uniaxial moment loading. The failure mechanism under vertical loading comprises a plane strain Prandti-type mechanism over the central part of the longer side, and the size of the mechanism gradually reduces at the ends of the longer side and over the shorter side as the corner of rectangular footing is being approached where the direction of soil motion remains normal to each corresponding side respectively. The failure mechanism under moment loading comprises a plane strain scoop sliding mechanism over the central part of the longer side, and the radius of scoop sliding mechanism increases linearly at the ends of the longer side. On the basis of the kinematic failure mechanisms mentioned above, the vertical ultimate bearing capacity and the ultimate bearing capacity against moment or moment ultimate bearing capacity are obtained by use of upper bound limit analysis theory. At the same time, numerical analysis results, Skempton' s results and Salgado et al. 's results are compared with this upper bound solution. It shows that the presented failure mechanisms and plastic limit analysis predictions are validated. In order to investigate the behaviors of undrained clay foundation beneath the rectangular footing subjected to the combined loadings, numerical analysis is adopted by virtue of the general-purpose FEM software ABAQUS, where the clay is assumed to obey the Mohr-Coulomb yielding criterion. The failure envelope and the ultimate bearing capacity are achieved by the numerical analysis results with the varying aspect ratios from length L to breadth B of the rectangular footing. The failure mechanisms of rectangular footing which are subjected to the combined vertical loading V and horizontal loading H (Vertical loading V and moment loading M, and horizontal loading H and moment loading M respectively are observed in the finite element analysis. ) is explained by use of the upper bound plasticity limit analysis theory. Finally, the reason of eccentricity of failure envelope in H-M loading space is given in this study, which can not be explained by use of the traditional ' swipe test'. 展开更多
关键词 rectangular footing upper bound limit analysis failure mechardsm failure envelope combined loading
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高职现代学徒制教学质量保障机制的构建 被引量:6
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作者 宋亚林 《湖北工业职业技术学院学报》 2017年第1期24-27,共4页
高职院校在推行现代学徒制试点工作中,为了确保教学质量的提高,构建基于现代学徒制的教学质量保障机制,是非常必要的。文章从教学目标管理机制、组织管理机制、制度管理机制、过程管理机制、监控、反馈与评价机制等方面入手,探讨了构建... 高职院校在推行现代学徒制试点工作中,为了确保教学质量的提高,构建基于现代学徒制的教学质量保障机制,是非常必要的。文章从教学目标管理机制、组织管理机制、制度管理机制、过程管理机制、监控、反馈与评价机制等方面入手,探讨了构建现代学徒制教学质量保障机制的构建思路。 展开更多
关键词 现代学徒制 教学质量 监控 机制
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Recent Advancement in Modeling Seafloor Dissipative Mechanism in Shallow Water
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作者 Philip L.-F.LIU Yong Sung PARK 《China Ocean Engineering》 SCIE EI 2008年第1期1-10,共10页
In this paper, the recent development in modeling seabed dissipative mechanisms in shallow water is reviewed. Specifically, laminar and turbulent boundary layer solutions as well as viscous mud flow solutions under tr... In this paper, the recent development in modeling seabed dissipative mechanisms in shallow water is reviewed. Specifically, laminar and turbulent boundary layer solutions as well as viscous mud flow solutions under transient waves are presented. These analytical solutions are compared with experimental data for both solitary waves and cnoidal waves. Very goed agreement is ohtained. The Boussinesq equations with boundary layer effects and the muddy seabed effects are also shown. 展开更多
关键词 seabed dissipative mechardsms boundary layer Boussinesq equations
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