本文選題：水力自控翻板閘門 + 淤沙��； 參考：《西北農(nóng)林科技大學(xué)》2016年碩士論文

【摘要】：水力自控翻板閘門構(gòu)造簡單,維護和消能的投入少,可靠性高,具有較大的泄流能力和較小的壅水,廣泛應(yīng)用于中小型水利工程,尤其在管理不便,水流湍急的山區(qū)低水頭閘壩工程中,有廣泛的應(yīng)用前景。在山區(qū)多泥沙河流中修建翻板閘門,閘前泥沙淤積是關(guān)鍵問題之一。研究淤沙對水力自控翻板閘門的影響對完善翻板閘門理論,改進門體結(jié)構(gòu)具有重要意義。論文針對目前我國應(yīng)用最廣泛的連桿滾輪式水力自控翻板閘門,以理論分析為基礎(chǔ),通過試驗和數(shù)值模擬系統(tǒng)地研究了泥沙淤積對閘門開啟過程、面板受力變形等產(chǎn)生的影響。得到的主要結(jié)論如下:(1)分析國內(nèi)外翻板閘門的研究成果,指出已有研究的不足是未充分考慮閘前泥沙淤積對水力自控翻板閘門的影響。(2)考慮法向淤沙壓力及附著力對連桿滾輪式翻板閘門受力的影響,建立翻板閘門開啟前極限平衡狀態(tài)下的力矩平衡方程,推求得出啟門水位的理論計算方法。(3)以理論計算為基礎(chǔ),通過模型試驗,對不同淤沙高度下的閘前水位與閘門傾角關(guān)系以及啟門水位與淤沙高度關(guān)系進行研究,得出閘前淤沙主要導(dǎo)致翻板閘門的啟門水位升高,對閘門的漸開性并無明顯的影響。與無淤沙狀態(tài)的啟門水位相比,設(shè)計淤沙高度下的啟門水位計算值升高了0.3%~5%,升高值占門頂水深的10.5%~62.3%;啟門水位實測值升高了1.4%~5.6%,升高值占門頂水深的19.9%~48.3%。這表明,淤沙引起的啟門水位升高是不能忽視的。在設(shè)計淤沙高度下,啟門水位的實測值與計算值的相對誤差為2.9%~4.0%,證明研究結(jié)果具有一定的可靠性。為簡化計算,對啟門水位計算值與淤沙高度的關(guān)系曲線進行擬合,得到了啟門水位的擬合公式。(4)運用ANSYS軟件,建立翻板閘門面板的有限元模型,對不同高度的泥沙淤積和啟門水位下的有限元模型進行數(shù)值模擬,得出泥沙淤積及啟門水位的升高導(dǎo)致門體的等效應(yīng)力、第一主應(yīng)力和變形不同程度地增大。閘前淤沙高度為0.4m和0.8m時的等效應(yīng)力最大值分別比無淤沙時增加了5%和11.8%,說明淤沙及啟門水位的升高對面板等效應(yīng)力的影響較大。淤沙高度為0.4m和0.8m時的第一主應(yīng)力最大值分別比無淤沙時增加了3.0%和5.8%,位移最大值分別增加了3.6%和7.0%,可見淤沙及啟門水位升高對面板的第一主應(yīng)力和變形也有一定的影響。(5)結(jié)合論文的研究成果,對翻板閘門閘前淤沙問題的研究提出了一些建議。
[Abstract]:Hydraulic automatic control gate with simple structure, less investment in maintenance and energy dissipation, high reliability, large discharge capacity and small backwater, is widely used in small and medium-sized water conservancy projects, especially in the inconvenient management. In the project of low head sluice dam in mountainous area with rapid flow, it has a wide application prospect. It is one of the key problems to build the sluice gate in the mountainous area with silt and silt in front of the sluice. The study of the influence of silt on hydraulic automatic control gate is of great significance to improve the theory and structure of the gate. Aiming at the most widely used hydraulic automatic control gate of connecting rod roller wheel in our country at present, based on theoretical analysis, the influence of silt deposition on the opening process of gate and the deformation of face slab is systematically studied by means of experiments and numerical simulation. The main conclusions are as follows: (1) the research results of flip gate at home and abroad are analyzed. It is pointed out that the influence of sediment deposition in front of sluice on hydraulic automatic control gate is not fully considered. (2) considering the influence of normal silt pressure and adhesion on the force of connecting rod rolling wheel gate. The moment equilibrium equation under the limit equilibrium state before the opening of the flip gate is established, and the theoretical calculation method of the opening gate water level is derived. (3) based on the theoretical calculation, the model test is carried out. The relationship between sluice front water level and gate inclination angle and opening gate water level and silt height under different silt height are studied. It is concluded that the silt level in front of sluice gate mainly leads to the increase of opening water level, but has no obvious effect on the gradual opening of gate. Compared with the open gate water level without silt state, the calculated value of the open door water level at the design silt height has increased 0.33%, and the increase value is 10.5% and 62.3% of the water depth at the top of the gate, and the measured value of the opening door water level has increased by 1.4 ~ 5.6%, which accounts for 19.948.3% of the water depth at the top of the gate. This shows that the elevation of water level caused by silt can not be ignored. Under the design silt height, the relative error between the measured value and the calculated value of the open door water level is 2.9 and 4.0, which proves that the research results have certain reliability. In order to simplify the calculation, the curve of relation between the calculated value of the open gate water level and the silt height is fitted, and the fitting formula of the opening gate water level is obtained. (4) the finite element model of the flip gate face plate is established by using ANSYS software. The finite element models of siltation and open gate water level at different heights are numerically simulated. It is concluded that the equivalent stress of the door body is caused by the silt deposition and the increase of the opening water level, and the first principal stress and deformation increase in varying degrees. The maximum equivalent stress at the height of 0.4m and 0.8m in front of sluice increases by 5% and 11.8m, respectively, compared with that without silt, which indicates that the increase of silt and water level at the opening gate has a great influence on the equivalent stress of the face slab. The maximum value of the first principal stress at the height of 0.4m and 0.8m increased by 3.0% and 5.8%, respectively, and the maximum displacement increased by 3.6% and 7.0%, respectively, when the silt height was 0.4m and 0.8m, respectively. It can be seen that the first principal stress and deformation of the face slab are also affected by the increase of silt and opening water level. (5) combined with the research results of the paper, Some suggestions are put forward for the study of silt in front of the gate.
【學(xué)位授予單位】：西北農(nóng)林科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TV663.8

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