不同坝型重力坝水下接触爆炸特性研究

发布时间：2018-03-23 07:29

本文选题：数值模拟　切入点：混凝土重力坝　出处：《工程科学与技术》2017年01期 　论文类型：期刊论文

【摘要】：近半个世纪以来,中国成为世界上建坝数量最多的国家。需要评估爆炸荷载对于大坝的安全的影响。本文为研究水下不同炸点接触爆炸对混凝土重力坝上游有折坡段和上游无折坡段两种坝型的动力响应以及破坏状态影响,进行了两种坝型的混凝土重力坝水下接触爆炸的动力响应及损伤破坏特性的对比分析。利用数值模拟方法计算了炸药在空气中爆炸对于混凝土板的损伤破坏,并与物理实验的结果进行对比。通过计算结果对比验证了所使用数值模型的正确性和可靠性。以混凝土重力坝上游有折坡段和上游无折坡段两种坝型为研究对象,考虑炸药-库水-空气-混凝土重力坝结构之间的动力耦合关系,对比分析了水下接触爆炸冲击荷载作用下,两种坝型的挡水坝段坝体的动态响应及损伤破坏分布特性。通过对比分析可知:混凝土重力坝上游有折坡段的挡水坝段减小了水下接触爆炸对坝体的加速度、速度及位移的动力响应。混凝土重力坝上游无折坡比有折坡坝型的挡水坝段在水下接触爆炸冲击荷载作用下损伤范围更大、更为严重。通过以上结果可得到结论:混凝土重力坝上游折坡段可以有效地散射爆炸产生的应力波,减小混凝土重力坝的损伤破坏程度。
[Abstract]:For nearly half a century, China has become the country with the largest number of dams in the world. It is necessary to evaluate the impact of explosion load on dam safety. In order to study the impact of underwater contact explosion at different exploding points on the upstream of concrete gravity dam with broken slope and upstream without break slope. The dynamic response and failure state of two dam types in the section, The dynamic response and damage failure characteristics of two kinds of concrete gravity dams subjected to underwater contact explosion are compared and analyzed. The damage and failure of concrete slabs caused by explosive explosion in air are calculated by using numerical simulation method. The validity and reliability of the numerical model are verified by comparing the calculated results with the results of physical experiments. Two kinds of dam types upstream of concrete gravity dam with broken slope and upstream without slope are taken as the object of study. Considering the dynamic coupling relationship between dynamite, reservoir, air and concrete gravity dam structures, a comparative analysis of underwater contact explosion impact loads is made. The dynamic response and damage and failure distribution characteristics of the dam body of two types of water retaining dam are compared and analyzed. The results show that the acceleration caused by underwater contact explosion is reduced in the dam segment with a broken slope upstream of the concrete gravity dam. The dynamic response of velocity and displacement. The damage range of the upstream of concrete gravity dam with no break slope is larger than that of the section of water retaining dam with broken slope type under the action of underwater contact explosion impact load. From the above results, it can be concluded that the upstream slope section of concrete gravity dam can effectively scatter the stress wave produced by explosion and reduce the damage and failure degree of concrete gravity dam.
【作者单位】：大连理工大学建设工程学部;大连理工大学海岸与近海工程国家重点试验室;
【基金】：国家重点基础研究发展计划资助项目(2013CB035905) 国家自然科学基金资助项目(51679030) 辽宁省教育厅重点实验室基础研究项目(LZ2015022) 中央高校基本科研业务费专项资金资助项目(DUT15LK34;DUT14QY10)
【分类号】：TV642.3

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