软土中张紧式吸力锚破坏标准模型试验与有限元分析

为了确定软土中张紧式吸力锚的破坏标准，采用自主研发的电动伺服加载装置，在荷载和位移控制方式下进行了张紧式吸力锚在最佳系泊点受静荷载作用的承载力模型试验。结果表明：不同的破坏模式，锚破坏时对应的位移也不同。当锚为竖向破坏时，对应锚沿系泊方向的位移约为0.6倍的锚径；当锚为水平破坏时，对应锚沿系泊方向的位移约为0.3倍的锚径。同时，按照模型试验所得的破坏标准确定的吸力锚的极限承载力与极限分析法的预测结果吻合较好。对足尺锚进行了有限元分析，将分析结果与极限分析法的预测结果进行比较，验证了模型试验所得位移破坏标准的合理性。

Model tests and finite element analysis of failure criterion of suction anchors with taut mooring systems in soft clay

In order to determine the failure criterion of suction anchors with taut mooring systems in soft clay, load-controlled and displacement-controlled model tests are conducted to study the bearing capacities of suction anchors with taut mooring systems under static load at the optimal loading point using an electric servo loading apparatus developed by the authors. The results show that the displacement along the mooring direction is about 0.6 times the diameter of anchor when the failure mode of anchor is vertical pullout; and the displacement along the mooring direction is about 0.3 times the diameter of anchor when the failure mode of anchor is lateral failure. At the same time, the bearing capacities of suction anchors are determined in terms of the failure criterion by model tests. The predicting results of limit analysis are basically in agreement with the results of model tests. Furthermore, it verifies the rationality of displacement failure criterion by the comparison of calculated results between finite element analysis and limit analysis on the full-scale anchors.