不同桩基方案下混凝土重力坝抗滑稳定分析

Sliding Analysis of Concrete Gravity Dam Under Different Pile Foundations

对某水电站工程重力坝靠近右岸岸坡的11号坝段的坝基抗滑稳定进行分析。由于该坝段一半坐落在基岩,一半坐落在土基,为了满足地基承载力以及抗滑稳定的要求,在该坝段基底需要设置桩基,桩基采用圆桩型式。文中对两种不同桩基方案下的整体结构进行三维有限元变形应力分析,得到了11号坝段及桩基的位移应力及分布规律,计算得出了该坝段的抗滑稳定安全系数。计算结果较为全面地反映了两种桩基方案下坝体及桩基的实际工作状况,为工程的优化设计提供了依据。

The stability against sliding of No.11 dam foundation of a hydropower project is studied in the paper. Since half of the dam base is located on bedrock while the other half is located on soil layer, pile foundations shall be provided at the dam base. The displacements and stresses of No. 11 dam and its pile foundations as well as their distribution laws are obtained through analyzing the integral structures of two kinds of pile foundations by 3D finite element method, and then the anti-sliding safety factor of the dam is calculated as well. The results fully reflect the actual working conditions of the dam under two kinds of pile foundations, providing a theory basis for the optimization of the project.