拱坝基础不对称性影响研究

结合国内外一些由于两岸基础不对性造成拱坝的影响实例，基于多次的地质力学模型试验和三维有限元计算分析，就锦屏一级高拱坝地形、地质条件不对性对拱坝整体稳定的影响和加固措施的选择进行了探讨。试验和数值结果均显示：上游坝踵拉应力偏大，下游出现拉应力。坝体应力不对称；左岸变形大于右岸，并且出现斜裂缝，超载能力偏低。通过研究，建议采用垫座及锚索等加固措施，使大坝整体处于平稳状态。

STUDY ON INFLUENCES OF ASYMMETRY ON ARCH DAM FOUNDATION

This paper reviews and analyzes the cases of failure arch dams caused by asymmetric dam foundation. Based on geomechanics model tests and three-dimensional finite element simulation, the influences of asymmetric foundation of Jinping high arch dam on integrity stability and its reinforcing measures are discussed. The physical experiment and numerical simulation show that tensile stresses at dam heel are too high, and emerge in downstream surface. The stress status of dam is asymmetric so that the deformation of the left abutment is larger than that of the right abutment, and leads to cater-cornered cracks to propagate along the downstream surface. The overload capacity of this arch dam is limited. By employing large concrete buttress and anchorages, the reinforcement measures are proposed for the stability of this arch dam.