九甸峡混凝土面板堆石坝挤压边墙施工有限元仿真分析

九甸峡水利枢纽坝址河谷左岸陡峭,局部存在倒坡,右岸发育侵蚀堆积阶地,河床覆盖层最大厚度54~56 m,地形地质条件极为复杂。混凝土面板堆石坝最大高度136.5 m,采用挤压边墙施工方法。采用三维非线性有限元法,对挤压边墙和坝体填筑施工过程进行仿真模拟,分析和比较该坝的应力和变形规律。获得了该坝应力和变形的主要特征值,并分析了挤压边墙施工对面板和堆石体应力和变形的影响,指出挤压边墙施工可以改善面板的应力和变形,其设计施工方案是合理的。所得结论可供类似工程参考。

FEM Emulation Analysis on construction of extrusion-sidewall for Jiudianxia Concrete Face Rockfill Dam

Jiudianxia Concrete Face Rockfill Dam is located in a narrow canyon with complicated topographical and geological condition.Within the dam site,the left bank is quite abrupt with partial adverse slopes,and an erosive accumulation terrace is developed on the right bank.The depth of the bed overburden therein is about 54~56 m.The maximum height of the dam is 136.5 m,for which the extrusion-sidewall technique is used for the construction.Based on 3-D non-linear FEM,the construction processes of both the extrusion-sidewall and the dam body dam are simulated in detail for analyzing and comparing the stress and deformation law of the dam,and then the main characteristic values of the stress and deformation of the dam body are obtained.Furthermore,the effect from the construction of the side wall on the stress and deformation of the face slab and rockfill body is analyzed as well.The study shows that the status of the stress and deformation can be improved by the construction of the side wall.It is demonstrated that the design scheme for the construction is reasonable and then can be used as a reference for the other similar projects.