青龙U型薄拱坝极限承载能力及渐进破坏模式分析

发布时间：2018-04-13 04:25

本文选题：U形薄拱坝 + 极限承载能力　；参考：《长江科学院院报》2017年10期

【摘要】：U型碾压混凝土薄、高拱坝在国内外尚不多见,其中湖北省青龙拱坝因地形条件的独特尤为特殊,应力分布规律较常规V型拱坝有根本性差异,即在距坝底1/4坝高的下游坝面拱冠处出现较大面积的拉应力区,因此对青龙U型薄拱坝破坏机制及安全度的探讨非常必要。基于带拉破坏Drucker-Prager准则,利用强度储备系数法和超载法,分别对青龙拱坝的极限承载能力进行弹塑性有限元分析;运用位移突变法、塑性区贯通及收敛性等破坏判据,探讨其破坏机制,评价其整体安全度。结果表明:选用分析承载能力的方法不同,则青龙U型薄拱坝在极限承载过程中上、下游坝面破坏形态不同,但坝体最终的破坏形态基本一致;总结了其渐进破坏模式特点,并指出其在极限承载过程中由于应力的自行调整,拉应力减小或消失,满足稳定安全要求。
[Abstract]:U type roller compacted concrete thin, high arch dam is still rare at home and abroad, especially Azure Dragon arch dam in Hubei Province because of the unique terrain conditions, stress distribution law is fundamentally different from the conventional V-type arch dam.In other words, there is a large area of tensile stress area at the arch crown of the downstream face of the dam, which is 1 / 4 of the dam height from the bottom of the dam, so it is necessary to discuss the failure mechanism and safety degree of Azure Dragon U-type thin arch dam.Based on the Drucker-Prager criterion with tensile failure, the ultimate load-bearing capacity of Azure Dragon arch dam is analyzed by using strength reserve coefficient method and overload method, respectively.The damage mechanism is discussed and the whole safety degree is evaluated.The results show that the failure patterns of the upper and lower reaches of Azure Dragon U-type thin arch dam are different in the ultimate loading process, but the ultimate failure patterns of the dam body are basically the same, and the characteristics of progressive failure mode are summarized.It is pointed out that the tensile stress decreases or disappears due to the self-adjustment of the stress in the process of ultimate loading, which meets the requirements of stability and safety.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;河南省水利勘测设计研究有限公司;水利部淮河水利委员会安徽省水利科学研究院;
【分类号】：TV642.43

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