带键槽透水底板上举力特性模型试验研究

发布时间：2018-12-12 05:39

【摘要】：为保护高坝下游河床和岸坡不受泄洪高速水流的严重冲刷,危及大坝安全,需修建各类消力塘防护结构以构建大坝安全第一道防线。各类消力塘防护结构的安全是高坝泄洪安全的前提保障。随着对高坝下游防护工程的研究不断深入,相继提出了带键槽消力塘底板、透水底板等不同结构形式的底板,增加消力塘的稳定性,消力塘形式也从"被动防护"模式向"主动防护"模式转变。对"主动防护"与"被动防护"相结合的带键槽的透水底板进行研究,通过模型试验从最大值、概率密度分布、幅值和功率谱等角度分析上举力的特性。结果表明,与带键槽的底板相比,增加透水孔可以降低上举力;上举力概率密度分布基本符合正态分布;上举力幅值降低;功率谱密度更加的趋近于低频。
[Abstract]:In order to protect the downstream riverbed and bank slope from the serious erosion of flood discharge and high speed flow and endanger the safety of the dam, it is necessary to construct various protective structures of stilling ponds to construct the first line of defense for dam safety. The safety of various protective structures of stilling ponds is the premise of flood discharge safety of high dams. Along with the research of the downstream protection engineering of the high dam, the bottom slab with different structure, such as the bottom plate of the stilling pool with the keyway and the permeable floor, has been put forward one after another to increase the stability of the stilling pool. The form of Xialieshang changed from "passive protection" to "active protection". The permeable bottom plate with keyway combined with "active protection" and "passive protection" is studied. The characteristics of lifting force are analyzed from the angles of maximum value, probability density distribution, amplitude and power spectrum through model tests. The results show that, compared with the bottom plate with keyway, increasing the permeable hole can reduce the lifting force, the probability density distribution of the lifting force basically accords with the normal distribution, the up lift amplitude decreases, and the power spectral density approaches to the low frequency.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家自然科学基金青年基金项目(51309177) 国家科技支撑计划(2011BAB05B05) 高等学校博士学科点专项科研基金(新教师类)(20120032120051)~~
【分类号】：TV653;TV135.2

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