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国家重点基础研究发展计划(2013CB035905)

作品数:29 被引量:105H指数:6
相关作者:陈健云徐强王铭明范书立曹阳更多>>
相关机构:大连理工大学天津大学昆明理工大学更多>>
发文基金:国家重点基础研究发展计划国家自然科学基金中央高校基本科研业务费专项资金更多>>
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29 条 记 录,以下是 1-10
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新旧抗震规范下重力坝抗震安全性能分析被引量:4
2017年
结合新修订的《水电工程水工建筑物抗震设计规范》(NB35047-2015)与原来的《水工建筑物抗震设计规范》(DL5073-2000),采用振型分解反应谱法分析了新旧规范下重力坝地震动应力、动位移与动加速度的分布规律。研究结果表明:与采用原规范计算得到的结果相比,采用修订规范后,各坝型基频对应的反应谱放大系数增大,计算出的坝顶动位移有所增大,而坝顶动加速度反应却呈现降低趋势;建基面部位地震动应力反应有所增大;坝头部位的地震动应力反应有所降低;坝头部位以下的上、下游坝面地震动应力有所增大。结论为工程设计人员利用新抗震规范对重力坝进行抗震安全性评价提供了参考。
范书立赵绍宇陈健云童伟
关键词:抗震设计规范反应谱法动力反应重力坝
混凝土重力坝接触爆炸的响应及破坏特性分析被引量:6
2016年
运用显式非线性动力分析程序LS-DYNA模拟正常蓄水位及空库条件下混凝土重力坝接触爆炸.考虑爆炸荷载作用下混凝土的高应变率的影响,采用HJC(HolmquistJohnson-Cook)本构模型模拟坝体混凝土的损伤破坏及塑性变形的破坏特性.首先构建炸药-空气-水-混凝土试块模型并对其进行了模型验证.然后构建炸药-空气-库水-坝体-地基之间的动态全耦合模型,并对正常蓄水位与空库条件下TNT炸药接触爆炸的大坝动态响应及破坏特征进行了分析.研究结果表明:运用该方法研究混凝土重力坝水下接触爆炸引起的结构动力响应问题,具有稳定的可靠性,弥补了试验研究的不足.正常蓄水位下,在上游布置炸点对坝体的动力响应及损伤程度影响更大,因此在研究大坝抗爆性能时,应重点关注正常蓄水位条件下大坝上游侧炸点水下接触爆炸时大坝的破坏特性.
徐强曹阳陈健云李静刘静
关键词:混凝土重力坝水下接触爆炸
High-speed photographic observation of collapse of two cavitation bubbles被引量:3
2016年
Cavitation as a hydrodynamic phenomenon exists widely in water conservancy, shipbuilding, chemical and many other industries.Previous cavitation bubble dynamic studies mainly focused on single cavitation bubbles and their interaction with the wall. This paper studies the interaction between two cavitation bubbles under conditions with or without a wall. The results show that if the inception of two cavitation bubbles is not synchronized, the cavitation bubble of early inception collapse backwards the cavitation bubble of later inception; if the inception of two cavitation bubbles is synchronized, the two bubbles collapse towards each other; if a wall exists nearby, no matter whether the line connecting the centers of the two cavitation bubbles is vertical or parallel to the wall, the two cavitation bubbles collapse towards each other and then gradually merge, and the merged collapse body quickly moves to the wall. It is suggested that, as the number of cavitation bubbles increases, the cavitation erosion effect is not simply increased proportionally. Instead, mutual inhibitory effect may be demonstrated.
LUO JingXU WeiLinLI Rui
基于锦屏一级原型观测水垫塘底板振动特性研究被引量:5
2016年
锦屏一级水电站大坝作为目前世界最高双曲拱坝,对于高水头水垫塘振动安全问题最为显著。基于锦屏一级高拱坝水垫塘泄洪振动原型观测试验,分析研究了在不同组次下水垫塘底板的振动响应,研究结果表明锦屏一级水垫塘底板在深孔单独泄洪时振动强度沿程逐渐增大,在表孔单独泄洪和表深孔联合泄洪时水舌在水垫塘附着点水流紊动剧烈,振动强度大;底板振动的优势频率基本分布在0.3-1.3 Hz之间,属于水流脉动的频率范围,在水流荷载作用下,底板做受迫振动;各相邻测点底板振动有很好的相关性;各组次底板振动的空间积分尺度都维持在45m以上,底板的整体性和结构完好。给锦屏一级水电站合理调度、科学的运行以及下游泄洪建筑物的运行安全提供了参考。
冷东升杨敏马斌刘昉
关键词:水垫塘底板
Cavitation bubbles collapse characteristics behind a convex body被引量:4
2013年
Cavitation bubbles behind a convex body were experimentally studied by a high speed camera and a hydrophone synchronously. The experiments were conducted in a circulating water tunnel with five various contraction ratios: β = 0.497, β= 0.6, β= 0.697, β= 0.751, and β= 0.799. The distributions of the cavitation bubble collapse positions behind the five different convex bodies were obtained by combining the images taken by the high speed camera. According to the collapse positions, it was found that no cavitation bubble was collapsed in the region near the wall until the ratio of the water head loss over the convex body height was larger than 20, which can be used to predict if the cavitation damage would occur in the tunnel with orifice energy dissipaters.
李瑶许唯临张亚磊张敬威陈春祺阿蓉
关键词:COLLAPSE
Experimental study of the interaction between the spark-induced cavitation bubble and the air bubble被引量:8
2013年
Experiments are carried out by using high-speed photography to investigate the interaction between the spark-generated cavitation bubble and the air bubble in its surrounding fluid. Three problems are discussed in detail: the impact of the air bubble upon the development of the cavitation bubble, the evolution of the air bubble under the influence of the cavitation bubble, and the change of the fluid pressure during the development of a micro jet of the cavitation bubble. Based on the experimental results, under the condition of no air bubble present, the lifetime of the cavitation bubble from expansion to contraction increases with the increase of the maximum radius. On the other hand, when there is an air bubble present, different sized cavitation bubbles have similarity with one another generally in terms of the lifetime from expansion to contraction, which does not depend on the maximum radius. Also, with the presence of an air bubble, the lifetime of the smaller cavitation bubble is extended while that of the bigger ones reduced. Furthermore, it is shown in the experiment that the low pressure formed in the opposite direction to the cavitation bubble micro jet makes the air bubble in the low pressure area being stretched into a steplike shape.
罗晶许唯临牛志攀罗书靖郑秋文
Influence of seismic input on response of Baihetan arch dam被引量:3
2014年
The dynamic responses of the arch dam including dam-foundation-storage capacity of water system,using two different earthquake input models,i.e.viscous-spring artificial boundary(AB)condition and massless foundation(MF),were studied and analyzed for the 269 m high Baihetan arch dam under construction in China.By using different input models,the stress and opening of contraction joints(OCJs)of arch dam under strong shock were taken into consideration.The results show that the earthquake input models have slight influence on the responses including earthquake stresses and openings of contraction joints in different extents.
徐强陈健云李静赵春风
重力坝岩基的整体损伤评价方法
本文采用Mazars模型提出了重力坝岩基的整体损伤因子。通过推导损伤和孔隙水压力及黏聚参数的关系,将求整体损伤因子的问题化为一个优化模型。并在同时使用了迭代法对重力坝岩基的损伤场与应力场的耦合的过程进行解耦运算,提高了计...
徐强陈健云李静赵春风
关键词:迭代法
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自由液面附近空化泡的溃灭特性被引量:4
2017年
研究自由液面附近空化泡的溃灭特性对认识水利水电工程中的空蚀破坏机理具有重要意义。为进一步认识自由液面附近空化泡的溃灭特性,开展了电火花激发空化泡试验。结果表明:(1)空化泡与自由液面距离较近时总是背离自由液面溃灭,背离的临界条件为空化泡与自由液面的距离约是空化泡最大半径的5倍。空化泡尺寸越大或空化泡与自由液面距离越近,其背离现象越明显。(2)自由液面附近双空化泡相向溃灭融合,且融合体背离自由液面移动。(3)在自由液面和空气泡的共同影响下,空化泡的溃灭方向是二者分别对空化泡作用的矢量和。通过本文研究,对自由液面附近空化泡的溃灭有了定量认识,可以在一定条件下预测空化泡的溃灭方向。
张亚磊许唯临张祺翟俨伟
关键词:空化泡自由液面
泥沙粒径对45号钢的磨蚀影响研究
在高含沙量的河流上兴建高水头、大流量的水利工程,泄水建筑物和水力机械等常常发生磨蚀破坏,严重威胁工程的安全运行。本文采用改进的振动空蚀试验方法,利用5种粒径的泥沙(0.531 mm、0.253 mm、0.063 mm、0...
缑文娟练继建王斌吴振
关键词:空蚀磨蚀泥沙粒径
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