【摘要】：在水利樞紐中,為了防止洪水漫過壩頂危及樞紐安全,必須布置泄水建筑物,以宣泄超過樞紐調(diào)蓄能力的多余水量,來保證擋水建筑物和其他建筑物的安全。本文是在江西省浯溪口水利樞紐的可行性研究報告和水工模型試驗的基礎(chǔ)上,對樞紐中的泄水建筑物的泄流規(guī)模和溢流壩的孔口尺寸進(jìn)行方案比選,確定了泄水建筑物和下游消能工程的布置。同時也對堰面曲線、下游消能、泄流能力和結(jié)構(gòu)穩(wěn)定設(shè)計分別進(jìn)行了計算,并且同水工模型試驗數(shù)據(jù)相比較,得出采用設(shè)計計算數(shù)據(jù)來進(jìn)行設(shè)計是安全的。本工程的溢流壩及消能型式的設(shè)計和研究也具有一定的代表性,也可供其他相似工程設(shè)計作為參考依據(jù)。本文在確定了泄水建筑物的設(shè)計方案后,也全面考慮了影響浯溪口水利樞紐泄流風(fēng)險的水文和水力的不確定性因素,建立了壩前水位和下泄流量兩種方式下的泄流風(fēng)險計算模型,通過對模型中洪水過程、泄流能力以及本文中定義的消減系數(shù)的隨機模擬,產(chǎn)生大量的隨機變量,利用Monte-Carlo模擬的方法分別計算了水文因子、水力因子以及兩者綜合因素下的泄流風(fēng)險值。其計算結(jié)果表明,水文因子的不確定性對泄流風(fēng)險計算的影響占主要地位,水力因子的不確定性對泄流計算的影響很小,可以忽略不計。在建立兩種泄流風(fēng)險計算模型時,利用壩前水位建立的風(fēng)險計算模型時考慮洪水過程線不確定性因素時,是利用對典型洪水過程放大的方法,對洪水過程線的不確定性考慮的不全面。在建立第二種風(fēng)險模型時,利用消減系數(shù)的大量隨機抽樣來實現(xiàn)了對洪水過程線的量化。兩種模型計算出的綜合風(fēng)險值,表明影響泄流的風(fēng)險因子越多,風(fēng)險的計算結(jié)果也就會越大,同時洪水過程線這一不確定性因素對泄流風(fēng)險也會產(chǎn)生影響。兩種模型下的綜合泄流風(fēng)險值都是在公認(rèn)的綜合性可接受風(fēng)險內(nèi),說明本文對泄水建筑物的設(shè)計是安全可靠的。
文內(nèi)圖片：
圖片說明：圖3.1兩條洪峰位置不同的洪水過程線
[Abstract]:In the water conservancy project, in order to prevent the flood from overflowing the dam top and endanger the safety of the project, it is necessary to arrange the drainage structure to vent the excess water quantity which exceeds the storage capacity of the project, so as to ensure the safety of the water retaining structure and other buildings. Based on the feasibility study report and hydraulic model test of Wuxikou Water Control Project in Jiangxi Province, this paper compares and selects the discharge scale of the discharge structure and the orifice size of the overflow dam, and determines the layout of the discharge structure and the downstream energy dissipation project. At the same time, the Weir surface curve, downstream energy dissipation, discharge capacity and structural stability design are calculated respectively. compared with the hydraulic model test data, it is concluded that it is safe to use the design calculation data to carry out the design. The design and research of overflow dam and energy dissipation type of this project are also representative, and can also be used as a reference for other similar engineering designs. After determining the design scheme of the discharge structure, this paper also comprehensively considers the hydrological and hydraulic uncertainty factors that affect the discharge risk of Wuxikou Water Control Project, and establishes the calculation model of discharge risk under two modes of water level and discharge in front of the dam. Through the random simulation of flood process, discharge capacity and reduction coefficient defined in this paper, a large number of random variables are generated. The discharge risk values of hydrological factor, hydraulic factor and their comprehensive factors are calculated by Monte-Carlo simulation method. The results show that the uncertainty of hydrological factors plays a major role in the calculation of discharge risk, and the uncertainty of hydraulic factors has little effect on the calculation of discharge risk, which can be ignored. When two kinds of discharge risk calculation models are established, the uncertainty factors of flood process line are considered when the risk calculation model established in front of dam water level is taken into account, and the uncertainty of flood process line is not considered comprehensively by using the method of amplifying typical flood process. In the second risk model, a large number of random sampling of reduction coefficients is used to quantify the flood process line. The comprehensive risk values calculated by the two models show that the more risk factors affect the discharge, the greater the risk calculation results will be. At the same time, the uncertain factor of flood process line will also have an impact on the discharge risk. The comprehensive discharge risk values under the two models are recognized as comprehensive acceptable risks, which shows that the design of drainage buildings in this paper is safe and reliable.
【學(xué)位授予單位】：南昌工程學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV61;TV65

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