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Researches on the Breakwater-foundation Stability under Wave Cyclic Loading

Author: FengXiaoWei
Tutor: ZuoZuoWang
School: Tianjin University
Course: Geotechnical Engineering
Keywords: Soft clay Dike Bulwark Wave cyclic loading Dynamic triaxial Strength weakening Finite Element Analysis Box bucket foundation Vane strength
CLC: TV139.26
Type: PhD thesis
Year: 2010
Downloads: 381
Quote: 3
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Abstract


Saturated soft clay under the action of wave load cycle, the the soil softening effect. Reduce the performance of the strength of the soil deformation modulus decreases, thus a significant reduction in the carrying capacity of soft clay foundation, affect the security and stability of the structure. Instability of the dams of the Yangtze Estuary Deepwater Channel Regulation Project Reason analysis and summary of proposed structures and buildings for the construction of the breakwater on soft ground, the dams, ports, we must consider the wave cyclic loading ground caused by the phenomenon of weakening . Intact soft clay to Tianjin Port semicircle body caisson, bucket foundation for the study, research by means of laboratory tests and other port structures the strength softening properties of the foundation soil under the wave action and its stability analysis. The main research contents of this paper include: 1. Related to degree of cyclic softening clay soil sensitivity. Sensitivity cohesive soil cyclic softening importance of the role and the degree of loose saturated sand liquefaction. Indoor Cross board tester sensitivity test, remodeling soil samples (full disturbance) intensity is reduced to 22% to 42% of the undisturbed soil strength, can be used to determine the degree of softening under the soil samples were fully disturbance; 2. Channel Regulation Project of the Yangtze River estuary summarize the early turn embankment on soft clay softening problem based on the study, added a new validation and contrast test, the test results more consistent with previous studies regularity results. Consider different combination of stress and the actual stress path loaded indoor dynamic triaxial test method, dynamic and static triaxial test results after normalization analysis showed a more significant regularity, the strength of the soft clay softening degree of environmental conditions, the relationship of the loading conditions, to determine the power of the soft clay softening criterion, provides a convenient means for engineering applications; normal consolidation of saturated soft clay by cyclic undrained shear strength of the soil reduced, similar to metal fatigue \Mainly due to cyclic loading of the soft clay internally generated the cumulative pore water pressure and unrecoverable structural damage. Based on the cumulative pore water pressure and cumulative deformation analysis of the law under cyclic loading, converted from the energy point of view, of the weakening mechanism of soft clay in the dynamic wave loads; according to the wave forces on the semi-circular body breakwater foundation stress distribution characteristics soft clay strength weakening the degree of laboratory test results on Soft Foundation of hemispheroid breakwater reinforcement before and after the stability of the finite element analysis, the calculation result is in good agreement with the measured data presented in the case of the intensity softening semicircle body the breakwater stability analysis method. By the Tianjin Port in situ vane shear strength test results of statistical regression method proposed in situ vane shear test results to determine the shear strength of soft clay indicators of Tianjin Port. The shear strength of this method is statistical regression indicators can be directly used for slope stability analysis, earth pressure and bearing capacity of foundation assessment. According to the projections of the soft clay shear strength index, proposed a simplified analysis method of the box bucket foundation breakwater stability.

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CLC: > Industrial Technology > Hydraulic Engineering > The basic science of water resources project > Hydraulics > Wave hydraulics > The role of the wave of the building
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