三峡工程永久船闸中隔墩岩体变形模拟研究

Study on the rock deformation of middle isolated pier of permanent ship lock in the Three Gorges Project

运用离散单元法 (DEM )与有限单元法 (FEM )等数值模拟方法 ,全面地对长江三峡工程永久船闸二闸室至三闸首部分的中隔墩岩体分别在施工期和运行期的变形规律进行了模拟研究 .综合分析结果表明 :垂直于闸室轴线的水平位移在开挖完成后基本处于稳定状态 ,而在运行期有所减少 ;平行于闸室轴线的水平位移总体向下游发展 ;而垂直方向的位移先表现为回弹 。

The middle isolated pier (MIP) is one of the key structures of permanent shiplock of Three Gorges Project on Yangtze River, China. The study on rock mass deformation of middle isolated pier of the second shiplock under various operation conditions is made. The numerical simulations using 2 D distinct element method and 3 D finite element method are used to analyze rock mass deformation law. The comprehensive results can be summarized as follows: (1) the horizontal displacement vertical to axial line of shiplock varies with process of excavation, and is in steady state after excavation; during operation of shiplock, the displacement is slightly decreased; (2) the horizontal displacement parallel to axial line of shiplock is of tendency of developing to downstream; and (3) the vertical displacement has the property of resilient deformation occurring during excavation, and then of subsidence with slightly various values taking place in different part of the middle isolated pier in different operation conditions.