重力坝均匀冲击破坏模型试验研究

发布时间：2018-03-01 11:12

  本文关键词： 冲击荷载 振动 破坏 重力坝　出处：《振动与冲击》2017年09期 　论文类型：期刊论文

【摘要】：采用逐级递增循环均匀冲击加载方式,研究重力坝模型的破坏特征、自振频率与模态振型变化规律、最大加速度响应与冲击能间关系。试验表明,随着冲击能的增加,坝体依次出现砂浆掉皮、掉皮区扩大、上部细小裂缝、上部裂缝扩展及贯通、上部坝体断裂、中部细小裂缝、中部裂缝扩展及贯通、中部坝体断裂;自振频率随冲击能增加而降低,冲击后模态振型前二阶变化较小,第三阶变化较大;冲击作用下坝颈最大加速度响应最大;响应趋势与损伤程度有关,冲击能逐渐增加,无损伤或损伤较轻部位响应依次为增加、减小、变化不大或略有增加,损伤较重部位依次为略有降低、增加、减小、变化不大或略有增加。
[Abstract]:The failure characteristics of gravity dam model, the variation law of natural vibration frequency and modal mode, and the relationship between maximum acceleration response and impact energy are studied by means of stepwise incremental cyclic uniform impact loading. The experimental results show that the failure characteristics of gravity dam model increase with the increase of impact energy. The dam body in turn appears mortar peeling out, the area of falling skin expands, the upper part of small crack, the upper crack spread and through, the upper dam body breaks, the middle part crack, the middle crack expands and passes through, the middle part dam body breaks; The frequency of natural vibration decreases with the increase of impact energy, the change of the first second order of modal mode is small, the third order changes greatly after impact, the maximum acceleration response of dam neck is the largest under impact, and the response trend is related to the degree of damage, and the impact energy increases gradually. The response of non-injury or light damage sites increased, decreased, changed little or slightly increased, and the damage heavier parts decreased, increased, decreased, changed little or slightly increased in turn.
【作者单位】： 南京水利科学研究院;水利部水科学与水工程重点实验室;
【基金】：国家自然科学基金资助项目(51179107)
【分类号】：TV131.6
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本文编号：1551676