长江三峡工程永久船闸中隔墩岩体变形分析及预测

采用综合方法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变形规律进行了分析及预测。首先,运用离散单元法与有限单元法等数值模拟方法分析了该段中隔墩岩体分别在施工期和运行期的变形规律。然后,在监测数据的基础上,采用时间序列和灰色系统方法预测了岩体的变形趋势。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,后发生沉降。

ANALYSIS AND FORECAST ON ROCK DEFORMATION OF MIDDLE-ISOLATED PIER OF PERMANENT SHIPLOCK IN THE THREE GORGES PROJECT ON YANGTZE RIVER

The middle-isolated pier is one of the key structures of permanent shiplock of the Three Gorges Project on Yangtze River,China. The rockmass deformation of middle-isolated pier of the second shiplock under various operation conditions is studied. The numerical simulations using 2-D distinct element method and 3-D finite element method are applied to analyze rockmass deformation law. Simultaneously,the time series analysis and grey system theory are used to predict the tendency of rock displacements based on in-situ measured data. The comprehensive results can be summarized as follows. (1) The horizontal displacement perpendicular 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. (3) The vertical displacement occurred as resilient deformation during excavation,and then subsidence with slightly various values takes place in different part of the middle-isolated pier under different operation cases.