| 摘要: |
| 三维情况下，桶体稳定性是一个复杂的空间结构与土相互作用的问题。结合工程实例，建立了三维新型桶式基础防波堤有限元模型，对其稳定性进行分析。从而，动力作用下桶体结构位移与目前静力计算的结果相差较大，针对这个问题，分析提出等效拟静力法，通过与动力作用后相等的孔压等效成与之对应的静荷载，然后计算桶体位移。该方法的关键是找出桶体前端底部土体孔压与静荷载之间的关系，同时找出此处土体孔压与动荷载之间的关系，从而建立静荷载与动荷载之间的关系。经数值模拟与试验对比，结果证明所提的等效拟静力法比较合理。在模拟与分析原型桶体基础上，进一步分析了不同尺度及不同荷载作用点高度时，桶体前端底部土体孔压与静荷载之间的近似直线关系。 |
| 关键词: 新型桶式基础防波堤 稳定性 静荷载 动荷载 等效拟静力法 |
| DOI： |
| 分类号:U656.2 |
| 基金项目: |
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| Stability analysis of new bucket foundation breakwater structure based on quasi-static method |
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YANG Li-gong1,2
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1.Department of Geotechnical Engineering, Tongji University, Shanghai;2.Nanjing Hydraulic Research Institue, Nanjing
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| Abstract: |
| Under the conditions of three dimensions, the stability of a bucket is one of the complex stability problems of the interaction between dimensional structures and soil mass. Based on case studies of real works, a finite element model (FEM) for the three-dimensional new bucket foundation breakwater has been established, and the stability of the bucket has also been analyzed. It is found from analyses that the calculation between the dynamic displacement and the static displacement is inconsistent. In regard to this problem, an equivalent quasi-static method has been proposed, which is a method transforming the dynamic problems to the static one. Under the action of the dynamic load, the water pressure will rise and reach a stable value; in another situation, the water pressure will also rise under the action of the static force. If the water pressure is equal for the two situations, then the equivalent static method can be applied to the calculation of the dynamic displacement. The key point of this method is to find the relationship between the bottom pore pressure response of the front end of the bucket and the static load, and the relationship between the bottom pore pressure response of the front end of the bucket and the dynamic load. Based on the two relationships, the relationship between the static load and the dynamic load can be established. From comparison between the numerical simulation results and test results, it is proved that this method is reasonable. On the basis of simulating and analyzing the prototype bucket foundation structure, the relationship is approximatively linear between the bottom pore pressure response of the front end of the bucket and the static load under different model sizes and different heights of the load application points. |
| Key words: new bucket foundation breakwater stability static load dynamic load an equivalent quasi static method |
