桶式基础结构土压力分布规律

Pattern of Distribution of Soil Pressure on Bucket Foundation

桶式基础结构是一种轻型结构,适用于承载力低的淤泥质地基,其稳定计算依靠桶体与土共同作用抵抗外荷载,因此土压力是桶式基础结构稳定计算的核心内容,其分布规律和大小对计算结果起到控制作用。通过模型试验结果验证了有限元模型参数取值的合理性,从而采用有限元数值模拟的方法,探讨了波浪荷载和回填荷载作用下,不同土层产生的主被动土压力分布规律,得到位移形式对土压力大小的影响、不同土层之间相互作用引起土压力分布形态的变化、理论公式的修正系数以及施工顺序对土压力分布形态的影响。研究成果明确了不同荷载作用和土层分布对土压力的影响规律,修正了主被动土压力的传统计算公式,为桶式基础结构稳定计算奠定了一定的基础。

Bucket foundation is a lightweight foundation structure suitable for silty soils of low bearing capacity. Its stability calculation relies on the interaction of the bucket body and the earth to resist external loads, so earth pressure is a key factor for stability calculation and its distribution law and size play a role in control of the calculation results. Model test results verify the rationality of the finite element model parameter values, so active and passive earth pressure distribution law of wave loads and backfill loads under different soil layer are studied by the method of finite element numerical simulation. These results are obtained that the size of earth pressure is affected on the displacement form; the earth pressure distribution change is caused by the interaction between the different soil layers; the correction factor of the theoretical formulae as well as the construction sequence is affected on earth pressure distribution shape. The result of this paper identified the different loads and soil distri- bution to earth pressure effect law, amendments to the traditional formula of active and passive earth pressure, and laid a foundation for stability calculation of bucket-based structure.