Abstract: The radial displacement of foundation surface of extra-high arch dam is an important physical quantity, and the deformation value and rate are related to dam safety. This paper proposes a calculation method for the radial displacement of foundation surface of extra-high arch dam based on monitoring and simulation analysis. On the basis of mechanical parameters of dam body and foundation obtained by combining the plumb-line monitoring data and inversion calculation, the distribution law of radial displacement of foundation along the elevation is analyzed and studied, and then the correlation between the radial displacement of the foundation gallery elevation and the radial displacement of the foundation surface is obtained, which provides a new idea for the calculation of the radial displacement of foundation of extra-high arch dam.

Key words: extra-high arch dam, foundation surface, radial deformation, plumb-line

摘要： 特高拱坝建基面径向变形是重要物理量之一，其变形量值和速率事关拱坝安全。笔者提出基于监测与仿真分析的特高拱坝建基面径向变形取值计算方法，在结合垂线监测数据和反演计算得到坝体和基础力学参数的基础上，分析研究基础径向变形沿高程分布规律，得到基础廊道高程径向变形和建基面径向变形之间的相关关系，为特高拱坝基础特别是建基面径向变形取值提供了新的思路。

关键词: 特高拱坝, 建基面, 径向变形, 垂线