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Earth pressure calculation for bucket wall of offshore bucket foundation
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摘要: 在风浪荷载作用下, 海上筒型基础结构的筒壁土压力计算是分析其稳定性的关键。当筒型基础发生转动时, 相比挡土墙的位移模式更加复杂, 筒体的转角和转动中心的位置都是影响土压力分布的重要因素。分析了筒型基础转动中心在不同位置时的土压力分布特点, 发现转动中心在筒体内部时, 同一侧筒壁上的土压力可能同时存在准主动区和准被动区, 呈非线性分布。基于考虑位移效应的土压力计算理论, 提出了适用于筒型基础不同转动模式的土压力计算方法, 得到筒壁纵向和环向的土压力计算式, 通过与现场实测结果和有限元模拟结果对比验证分析, 发现理论计算结果与实测结果和数值模拟结果一致性较好, 且能体现土压力的环向分布特点。Abstract: The calculation of the earth pressure under the action of wind and wave loads is the key to analyze the stability of the offshore bucket foundation structure.When the bucket foundation structure rotates, the displacement model is more complicated than that of the retaining wall, both the rotation angle and the rotation center are important factors affecting the earth pressure distribution on the bucket wall.The earth pressure distribution characteristics of different rotation centers of the bucket foundation are analyzed in this study, and it is found that when the rotation center is in the bucket, the earth pressure at the same side of the bucket may have both quasi active and quasi passive regions, and with nonlinear distribution.Based on the earth pressure theory considering displacement effect, an earth pressure calculation method suitable for different rotation modes of the bucket foundation is proposed, and the formulas for calculating the longitudinal and circumferential earth pressures are obtained.By comparing the field test results with the finite element simulation results, it is found that the calculation results are in good agreement with the measured data and the numerical simulation results, which can reflect the circumferential earth pressure distribution characteristics.The research results are of theoretical significance to the stability study of the offshore bucket foundation.
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Key words:
- bucket foundation /
- earth pressure /
- displacement /
- wind and wave loads
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图 1 土压力与挡土墙位移的关系
Figure 1. Relationship between earth pressure and displacement of retaining wall
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