重力坝冲沙泄洪闸左导墙抗滑稳定及静动应力分析

Anti-sliding stability and stress analysis of the left guide wall in the sluicing sluice section of gravity dam

为研究冲沙泄洪闸坝段左导墙在复杂地基开挖面上的抗滑稳定及静动应力分布规律,本文运用大型通用有限元软件ABAQUS对冲沙泄洪闸左导墙坝段进行了三维数值仿真计算。研究表明:左导墙坝段建基面处扬压力水头呈现上下游坝段高,中间坝段低的分布特征;各典型纵横断面以及导墙坝段整体在顺河向和横河向上的抗滑稳定安全系数均符合规范要求,不存在滑移问题;左导墙坝段建基面沿坝轴向最大拉应力超出其轴心抗拉强度,竖向最大拉应力区宽度以及最大剪应力等均满足地基承载力要求。但是计算结果反映出,导墙在坝左0+099.00与建基面的结合部位为应力薄弱面,出现了混凝土拉裂破坏的情况,对工程安全造成极大的隐患,建议进一步进行结构优化设计。

In order to study the anti-sliding stability and static and dynamic stress distribution of the left guide wall of the sluicing sluice dam section on the excavation surface of complex foundation,in this pa-per,the three-dimensional numerical simulation of the left guide wall section of the sand sluice is carried out by using the general finite element software ABAQUS.Research results show that the head of uplift pressure at the foundation surface of left guide wall dam section is characterized by high upstream and downstream dam sections and low middle dam sections.The safety factors of anti-sliding stability of each typical vertical and horizontal section and the guide wall dam section in the direction of river and river are in line with the requirements of the specification,and there is no sliding problem.However,the calcula-tion results show that the joint of the guide wall at 0+99.00 on the left side of the dam and the founda-tion surface is the weak stress surface,which leads to the situation of concrete cracking,causing great hidden danger to the project safety.It is suggested to further optimize the structure design.