曲线顶管底幕法施工对沉船扰动的CEL数值模拟

CEL Numerical Analysis of Disturbance of Constructing Curved Beam Based on“Yangtze River Estuary II”Ancient Wreck

依托“长江口二号”沉船打捞工程,采用耦合欧拉-拉格朗日法对极小曲率半径矩形曲线顶管底幕法沉船打捞工程进行数值模拟分析,获得底幕施工过程中顶推力以及船体竖向位移的动态变化,并与模型试验结果进行了对比验证.结果表明:所提的数值模型模拟结果和模型试验结果吻合较好,能较精确地预测沉船的变位和顶管的顶推力变化;最后一根管节推进为最危险工况,需要加强施工控制;采用左右对称推进而非顺序推进能够有效降低施工对沉船和土体的扰动.

Based on the salvage project of“Yangtze River Estuary II”ancient wreck,a coupled Eluer-Lagrangian(CEL)numerical analysis was conducted for the wreck salvage project adopting the curved beam based method using rectangular curved pipe jacking with an extremely small radius of vertical curvature.The dynamic evolutions of the driving force and the vertical displacement of the wreck were obtained and compared with the results of model test.The results show that the simulation results of the established numerical model agree well with the experimental data,which could predict the variation laws of movement and the driving force of the wreck.Pipe jacking of the last beam is the most dangerous,which requires a strengthened construction control.In comparison with sequential jacking from one side to the other,the left-to-right symmetric jacking can effectively reduce the disturbance to the wreck and its surrounding ground.