小浪底斜心墙堆石坝的有效应力分析

Analysis of Effective.Stress in the Xiaolangdi Declined-Core Earth and Rock Fill Dam

采用非线性有限元模型，对黄河小浪底斜心墙堆石坝的最终设计断面在施工和蓄水过程中的应力和变形状态进行了分析。主混凝土防渗墙采用梁单元模拟，并在砂砾石与混凝土防渗墙以及粘土与混凝土防渗墙间设置接触面单元。上游旋喷混凝土防渗墙采用普通实体单元进行模拟。结果表明，上游旋喷混凝土防渗墙中的应力不超过１１ＭＰａ，不会有强度问题；而对于主混凝土防渗墙，由于在施工期和蓄水淤积期均承受较大的压应力，因此该防渗墙的设计和施工是整个坝体的关键问题。在整个坝体的施工和运行过程中，坝体中不会产生过高的超静孔隙水压。坝体的整体设计合理可靠。

The stress and deformation have been analyzed, using non-linear finite element models, of the final design sections of the Xiaolangdi declined-core earth and rockfill dam during both construction and impoundment periods. In the process of analysis, the main concrete cut-off wall was simulated in beam elements while concoct elements were placed, for the purpose of simulation. between the gravel/concrete cut-off wall and the clay/concrete wall. General solid elements were used to simulate the upstream jet concrete cut--off wall. As the result shows, the stress in the upstream jet cut-off wall will not exceed 11 MPA which represents no strength problems. Being exposed to higher pressure stress in the consttuction and impoundlnent periods. the main concrete cut-off wall. in respect of design and execution. will be the key of the dam. There will exist no super septic pore water pressure in the dam mass during its construction and operation periods.The design of the dam mass is thus reasonable and reliable.