Numerical Analysis Of Factors Influencing Double-row Diaphragm Wall Supporting Structure And The Adjacent Ship Lock

During the expansion of the ship lock project,the project’s foundation pits will have a certain degree of impact on the existing structure.This research analyzed several main factors influencing the deformation and stress characteristics of double row diaphragm wall(DRDW)and the deformation on the adjacent ship lock chamber,with numerical simulation as the main research method.MIDAS GTS NX numerical simulation is used to construct a finite element model(FEM)of the deep foundation pit of the newly built ship lock and the reliability was verified via comparison with the engineering monitoring data from the construction and survey unit.Based on the constructed model,some of the important factors influencing the supporting structures were studied through a series of numerical simulation and analysis.The influence of each factors on the deformation and stress characteristics of the DRDW supporting structure and displacement of the nearby ship lock were analyzed and calculated.Results show that:(1)The soil reinforcement depth between the double row diaphragm walls effectively improves the displacement of the front wall as well as the adjacent ship lock chamber.(2)The displacement of the double row diaphragm wall supporting structure as well as displacement of the adjacent ship lock chamber can be reduced by increasing the thickness of the front wall.The increase in the thickness of rear wall has minimal effect on the displacement of front wall but has slight effect on the displacement of the rear wall as well as on the horizontal and vertical displacement of the adjacent ship lock chamber.The increase in the thickness of connecting plate has no effect on the displacement of the front wall and the rear wall but it increases the horizontal displacement of the adjacent ship lock chamber.(3)The number of internal supports has great effect on the maximum horizontal displacement of the front and rear wall as well as on the displacement of adjacent ship lock chamber.The change of the support stiffness mainly affects the wall above the maximum horizontal displacement point and there is minimal effect on the wall below the maximum horizontal displacement point.