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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。
In order to determine the failure criterion of tensioned suction anchor in soft soil, a self-developed electric servo loading device was used to carry the load capacity of the tensioned suction anchor at the optimal mooring point under the load and displacement control mode Model test. The results show that the different displacement modes are different when the anchor is broken. When the anchor is vertically damaged, the displacement corresponding to the anchor along the mooring direction is about 0.6 times the anchor diameter. When the anchor is horizontal, the displacement corresponding to the anchor along the mooring direction is about 0.3 times the anchor diameter. At the same time, the ultimate bearing capacity of the suction anchor determined according to the failure criterion obtained by the model test is in good agreement with the prediction result of the limit analysis method. The full-scale anchor was analyzed by finite element method, and the results of the analysis were compared with those of the limit analysis method to verify the rationality of displacement failure criterion obtained from the model test.