基于离散元的白鹤滩反拱型水垫塘底板稳定性研究

Study on the stability of Baihetan anti-arch bottom plate based on Discreteelement Method

为研究白鹤滩反拱型水垫塘底板的失稳机理和稳定性规律,采用距离势函数离散单元法,建立离散单元模型进行仿真计算,并针对不同结构缝宽度、锚固水平及正向荷载作用位置进行底板稳定性的敏感性分析。研究表明:白鹤滩反拱型水垫塘底板的失稳机理为受正向荷载的底板与其两侧底板接触后,会带动两侧底板向反拱边缘滑动并翘起,直至完全脱离两侧底板约束。结果表明:底板间结构缝宽度的增大会降低锚筋的锚固效果,脉动荷载相同大小下,其作用的范围越广,越靠近反拱边缘,则底板越易失稳。

In order to study the instability mechanism and stability law of the inverted arch plunge pool floor of Baihetan,the limitations of nonlinear problems such as collision and large displacement in the finite element method are overcome.The discrete element model is established,and the simulation is calculated by the discrete potential method of the distance potential function.The sensitivity analysis of the stability of the bottom plate is carried out for different structural joint widths,anchoring levels and forward load positions.The research shows that the instability mechanism of the bottom wall of the inverted arch plunge pool of Baihetan is that after the bottom plate of the forward load contacts the bottom plates of both sides,the bottom plates of both sides will slide and tilt up to the edge of the inverted arch until they are completely separated from the sides.Bottom plate constraint.The results show that the increase of the joint width between the bottom plates will reduce the anchoring effect of the anchors.Under the same pulsation load,the wider the range of action,the closer to the edge of the inverted arch,the more unstable the bottom plate will be.