高拱坝坝肩接触爆炸毁伤安全评价方法

坝肩稳定是高拱坝结构整体安全运行的基础,尽管高拱坝由于拱形受力特性具有较高的承载能力,但坝肩在遭受爆炸荷载作用后极易发生局部毁伤破坏,从而影响高拱坝结构的整体稳定性。着重对高拱坝遭遇水下接触爆炸毁伤后整体的安全稳定评价方法开展了研究,以刚体极限平衡法为基础,针对坝肩的毁伤破坏特征及毁伤面积,提出了拱圈沿右拱端面抗滑安全系数的评价准则,探讨了拱端面的损伤破坏对高拱坝沿拱端面抗滑稳定的影响。结果表明:坝肩接触爆炸主要引起接触部位坝体的压缩破坏和邻近拱端面的剪切损伤,而拱端面的毁伤将直接降低拱圈沿拱端面的抗滑稳定性,并最终导致高拱坝整体沿拱端面滑动失稳。

Safety evaluation method of a high arch dam with abutment suffered contact explosion

Abutment stability of high arch dams is a fatal factor to the global safe operation of the dam. Although high arch dams have high bearing capacity due to the characteristic of the arch structure, abutment tends to suffer local damage and failure subjected to blast loading which will affect the global stability of the dam. This paper focuses on the overall safety and stability evaluation method of the high arch dam suffers underwater contact explosion damage. Based on the rigid body limit equilibrium method, according to the characteristics and area of the abutment damage, the evaluation criteria of the anti-sliding safety factor are discussed. The influence of the damage of the arch end face on the anti-sliding stability of the high arch dam along the base surface is discussed. The results indicate that the high arch abutment mainly suffers the compression failure around the initiation point and the cracking damage of the adjacent base surface subjected to underwater contact explosion. Moreover, the crack damage of the base surface will directly reduce the anti-sliding stability of the overall high arch along the base surface and finally causes the whole high arch dam slides along the base surface.