地下洞室自稳性的尺寸效应研究

Study on Size Effect of Self-stability of Underground Cavern

在同一水电站工程中,不同洞径的地下洞室虽然具有类似的地质环境和围岩性质,但是洞室破坏往往存在显著不同的特征,存在显著的尺寸效应。文章以辽宁省胜利水电站的地下洞室群为例,选择不同尺寸的洞室断面,利用FLAC3D软件对洞室变形的尺寸效应展开研究,结果表明洞室位移变形、塑性区深度与洞室尺寸之间存在二次函数关系。

The underground caverns with different diameters have similar geological environments and surrounding rock properties, but the cavern damage often has significantly different characteristics, and there is a significant size effect in the same hydropower station project. The underground cavern group of Shengli Hydropower Station in Liaoning Province is adopted as an example for selecting cavern sections with different sizes, and the size effect of cavern deformation is studied by using FLAC3D software. The results show that there is quadratic function relationship among cavern displacement deformation, plastic zone depth and cavern size.