浯溪口水利枢纽泄水建筑物设计及泄流风险分析

发布时间：2019-07-04 20:52

【摘要】：在水利枢纽中,为了防止洪水漫过坝顶危及枢纽安全,必须布置泄水建筑物,以宣泄超过枢纽调蓄能力的多余水量,来保证挡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枢纽的可行性研究报告和水工模型试验的基础上,对枢纽中的泄水建筑物的泄流规模和溢流坝的孔口尺寸进行方案比选,确定了泄水建筑物和下游消能工程的布置。同时也对堰面曲线、下游消能、泄流能力和结构稳定设计分别进行了计算,并且同水工模型试验数据相比较,得出采用设计计算数据来进行设计是安全的。本工程的溢流坝及消能型式的设计和研究也具有一定的代表性,也可供其他相似工程设计作为参考依据。本文在确定了泄水建筑物的设计方案后,也全面考虑了影响浯溪口水利枢纽泄流风险的水文和水力的不确定性因素,建立了坝前水位和下泄流量两种方式下的泄流风险计算模型,通过对模型中洪水过程、泄流能力以及本文中定义的消减系数的随机模拟,产生大量的随机变量,利用Monte-Carlo模拟的方法分别计算了水文因子、水力因子以及两者综合因素下的泄流风险值。其计算结果表明,水文因子的不确定性对泄流风险计算的影响占主要地位,水力因子的不确定性对泄流计算的影响很小,可以忽略不计。在建立两种泄流风险计算模型时,利用坝前水位建立的风险计算模型时考虑洪水过程线不确定性因素时,是利用对典型洪水过程放大的方法,对洪水过程线的不确定性考虑的不全面。在建立第二种风险模型时,利用消减系数的大量随机抽样来实现了对洪水过程线的量化。两种模型计算出的综合风险值,表明影响泄流的风险因子越多,风险的计算结果也就会越大,同时洪水过程线这一不确定性因素对泄流风险也会产生影响。两种模型下的综合泄流风险值都是在公认的综合性可接受风险内,说明本文对泄水建筑物的设计是安全可靠的。
文内图片：

图片说明：图3.1两条洪峰位置不同的洪水过程线
[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.
【学位授予单位】：南昌工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV61;TV65

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