多弯段溢洪道糙条对水流消能导流作用研究

发布时间：2019-01-18 21:08

【摘要】：多弯段溢洪道等水工建筑物,在工程实践中,常会因当地地形、地质等因素限制,溢洪道在平面上因地制宜扭转一个角度,不仅充分利用地形,而且可以节约工程量。以“635”水库溢洪道为研究对象,对于弯道环流发生等问题,采用模型试验与数值模拟相结合的方法,在多弯段溢洪道内布置合适尺寸的导流墩、糙条等辅助措施达到消能导流的目的,最终得到以下结论:(1)多弯段溢洪道加设糙条是一种解决弯道环流较为理想的工程措施。它不仅使加糙区流速大幅度降低,而且糙条布置与溢洪道横断面成一定夹角将水流导向凸岸,减小了凹凸两岸的水位差。(2)多弯段溢洪道上连续一定距离布置多个糙条,对水流的消能导流作用要优于单一糙条布置型式。对于直线过渡段溢洪道弯道,在弯道段合理布置糙条,防止弯道上游水位雍高水流翻越边墙等现象产生。(3)对三种不同糙条宽度及四种布置角度的设计方案,分别进行了组合试验研究。结果表明,针对“635”溢洪道糙条宽度b=2.50m时消能导流效果优于b=1.33m的设计方案。而布置角度θ=30°的消能导流效果远不如角度θ=11.785°~24°的布置型式。同时,也表明加设糙条后凹岸一侧的水流流速消减效果较好。(4)根据糙条设计布置角度θ、设计宽度b及设计凹凸岸高度h1、h2,共有135种组合设计方案。对多弯段溢洪道糙条消能导流作用进行了探讨。当糙条宽度b=1/21B~1/39B(B为溢洪道宽度);糙条高度h1为1/2.17h~1/3.4h,糙条高度h2为1/3.2h~1/6.7h(h为溢洪道凹岸平均水深)时,多弯段溢洪道糙条消能导流效果显著。
[Abstract]:In engineering practice, the spillway of multi-curved section and other hydraulic structures are often restricted by local topography, geology and other factors, and the spillway turns an angle according to the local conditions on the plane, which not only makes full use of the topography, but also saves the engineering quantity. Taking the spillway of "635" reservoir as the research object, the flow guide piers of appropriate size are arranged in the spillway of multi-bend section by the method of model test and numerical simulation. The results are as follows: (1) the addition of rough strip in spillway of multi-curved section is an ideal engineering measure to solve the circulation of curved channel. It not only reduces the velocity of flow in roughened area by a large margin, but also leads the flow of water to the convex bank at a certain angle between the stripe arrangement and the cross section of the spillway, thus reducing the water level difference between the concave and convex banks. (2) multiple stripes are arranged continuously at a certain distance on the spillway in the multi-curved section. The effect of energy dissipation and diversion on water flow is superior to that of single stripe arrangement. For spillway bends in the straight transition section, rough strips are arranged reasonably in the bend section to prevent the upstream water level of the bend from surpassing the sidewall and so on. (3) the design scheme of three different stripe widths and four layout angles, Combined experiments were carried out respectively. The results show that the energy dissipation and diversion effect of "635" spillway is better than that of bang 1.33 m when the width of stripe is 2.50 m. However, the effect of energy dissipation and diversion at the angle of 胃 = 30 掳is far less than that of the arrangement of angle 胃 = 11.785 掳~ 24 掳. At the same time, it is also shown that the flow velocity reduction effect on the side of the coarseness bank is better. (4) according to the angle 胃 of the stripe design, the design width b and the height of the convex bank h _ 1 / h _ 2, there are 135 kinds of combined design schemes. The energy dissipation and diversion of spillway in multi-curved section are discussed. When stripe width b=1/21B~1/39B (B is spillway width); When the stripe height H1 is 1 / 2.17hU / 1 / 3.4h, the stripe height H2 is 1/3.2h~1/6.7h (h is the mean water depth of the spillway concave bank), the energy dissipation and diversion effect of the multi-curved spillway is remarkable.
【学位授予单位】：新疆农业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TV651.1;TV135.2

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