船坞坞口变截面底板应力及沉降有限元分析

Finite Element Analysis of Stress and Settlement of Dock Entrance with Variable Cross-section Bottom Plate

以江苏省某干船坞坞口为例,在考虑了翼墙与底板、底板与地基共同作用以及闸门对水平水压力的传递作用下,采用ABAQUS有限元软件对带翼墙船坞坞口底板进行了三维有限元模拟,分析了变截面底板的最大主应力、Tresca应力及底板沉降位移量。结果表明,闸门关闭时,闸门与翼墙连接处的最大拉应力大于混凝土的抗拉强度;闸门开启和闸门关闭时,船坞坞口底板变截面处的应力区别很大,变截面底板的最大主应力满足混凝土的抗拉强度,但Tresca应力在坞口变截面位置大于混凝土的抗剪强度,底板顶层与底层对应位置的Tresca应力分布基本一致(变截面除外);船坞坞口土体沉降位移较大。可见船坞闸门与翼墙连接处的最大拉应力、底板变截面处的Tresca应力及船坞坞口土体沉降位移应引起足够重视。

This paper selected a certain dock entrance in Jiangsu Province as an example. Considering the interaction between wing wall and floor as well as floor and foundation soil, transitive relation between gate and horizontal water pressure, it analyzed maximum principal stress, Tresea stress and settlement displaeement of a dock entrance variable cross section bottom plate based on a three dimensional finite element simulation by ABAQUS. The results show that the maximum principal stress at connection between gate and wing wall is larger than tensile strengths of concrete when gate is closed; while there is a large difference in stress of variable cross-section bottom plate when gate is open or closed; the maximum principal stress of variable loeation satisfies the tensile strengths of concrete, but Tresca stress is larger than its shear strength; Tresea stress distribution is the same trend between the surface and bottom face of bottom plate except the stress of variable cross section; furthermore the settlement displacement of dock entrance is large. Therefore, it should be given more attention on the maximum principal stress at connection between gate and wing wall, the Tresea stress of variable cross-section and the settlement displacement of dock entrance.