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该文针对深山峡谷中高拱坝半径较小且截面尺寸较大,曲率和剪切变形对临界荷载的影响较为明显的特点,基于大曲率深拱问题在拱坝中应用的理论和经典的拱梁分载理论,对《拱坝抗曲折稳定分析再探》中的算例重新校核,重新定义拱坝水平拱圈的抗曲折稳定系数,并结合柔度系数绘制两者关系曲线,更直观的判定水平拱圈的稳定性。结果表明:对于拱坝的中上部,拱圈起主要承载作用,拱圈的稳定性较弱,曲率和剪切变形的影响不明显,容易发生失稳,故在校核稳定时应当给予重视;对于中下部,拱圈的稳定性较强,但剪切与曲率的影响较为明显,并且剪切变形的影响大于曲率的影响;高拱坝的柔度系数越大则拱圈曲折失稳范围越大,柔度系数为10时坝高全范围拱圈将不曲折失稳。
In view of the fact that the influence of the curvature and shear deformation on the critical load of the high arch dams in the deep canyon is small and the cross section size is large, the theory of the arch dams with large curvature and the classical arch beam The theory of the load-separation theory is used to re-check the case of “Anti-Zigzag Stability Analysis of Arch Dam” to redefine the anti-buckling stability factor of horizontal arch arch of arch dam and to draw the relationship curve between them with the flexibility coefficient to be more intuitive Determine the stability of the horizontal arch. The results show that the arch ring plays an important role in the upper and middle part of the arch dam. The stability of the arch ring is weak, and the influence of curvature and shear deformation is not obvious, so the instability is liable to occur. Therefore, attention should be paid to the stability of the arch ring. For the middle and lower part, the stability of arch ring is stronger, but the influence of shear and curvature is more obvious, and the influence of shear deformation is greater than that of curvature. The greater the flexibility coefficient of arch dam, Large, softness factor of 10 dam full range of arch ring will not buckle instability.