水平荷载作用下三桶基础承载特性研究

Study on the Bearing Characteristics of Tripod Suction Bucket Foundation under Lateral Loading

通过建立三维有限元模型,土体采用弹塑性边界面理论,设置不同的加载方向和重力荷载,探究三桶基础的水平承载特性;通过验证现有模型试验,证实数值方法的可行性.研究结果表明:60°水平加载(单桶受压,双桶受拉)极限承载力最小,基础的水平极限承载力由受压桶控制;0°(双桶受压,单桶受拉)方向加载,自重荷载较小时,基础的承载力随着自重荷载的增大而增大,受拉桶的抗拔承载力决定了基础的总体承载力,自重荷载较大时,基础的水平承载力会减小,受压桶的抗压承载力决定了基础的总体承载力;60°方向加载时,基础的承载力随自重荷载的增大而减小,受压桶的沉降决定了基础的转角.

The three-dimensional finite element model is established to investigate the horizontal bearing characteristic of the tripod suction foundation by setting different loading direction and gravity load.An elastic-plastic bounding surface constitutive model is used to simulate the stress-strain behavior of clays.The feasibility of the numerical method is verified by predicting the existing model test results.The research results show that the ultimate bearing capacity at 60°horizontal loading direction(one-bucket compression,two-bucket tension)is the smallest,and the overall bearing capacity of the foundation is controlled by the compressed bucket.When the self-weight load is less,the ultimate bearing capacity at 0°loading direction(two-bucket compression,one-bucket tension)of the tripod suction bucket increases with the increase of the self-weight load,and the pull-out capacity of the tensioned bucket determines the overall load bearing capacity of the foundation.When the self-weight load is larger,the ultimate bearing capacity of the foundation decreases and the compressive bearing capacity of the compressed bucket determines the overall bearing capacity of the foundation.The ultimate bearing capacity of the tripod suction foundation at 60°loading direction decreases as the self-weight load increases and the settlement of the compressed bucket determines the overall rotation angle of the tripod suction bucket.