基于变形加固理论的高拱坝坝踵开裂分析

Analysis of dam heel cracking in high arch dam based on deformation reinforcement theory

本文运用变形加固理论从变形稳定的角度来研究高拱坝坝踵开裂问题。变形加固理论揭示了加固力、自承力、外荷载、结构稳定性、变形之间的内在关系,指出在给定荷载下,结构出现不平衡力的区域为破坏先导区域,为抑止破坏所需加固力就是不平衡力的反向力。研究指出,拱坝坝踵区为不平衡力集中区,分析坝踵区不平衡力的分布和方向将有助于认清坝踵开裂模式,不平衡力的大小可以作为坝踵开裂的评价指标。文末以小湾拱坝为实例进行了计算。

Deformation reinforcerhent theory is used to analyze the cracking problem of dam heel.By applying this theory the relationships among reinforcement force,self-bearing force,load,stability and deformation of structure can be revealed.Under the action of a given load the area where unbalanced force area existed is the location of initial failure occurred.The reinforcement force to restrain the failure must be in the opposite direction of the unbalanced force.It may conclude that the dam heel is the concentrated area of unbalanced force,so that the analysis on distribution and direction of unbalanced force is helpful to clarify the cracking mode of dam heel and the magnitude of this force can be regarded as the assessment index of cracking.