發(fā)布時(shí)間：2018-04-15 16:53

  本文選題：堤防決口 + 封堵方法��； 參考：《水利水運(yùn)工程學(xué)報(bào)》2017年03期

【摘要】：堤防決口搶險(xiǎn)需以水流水力學(xué)特性為依據(jù),封堵方法亦直接影響其封堵效率。首先對(duì)決口水流遇障礙物的洪水演進(jìn)過程進(jìn)行模擬,將水深計(jì)算結(jié)果與Biscarini等的試驗(yàn)數(shù)據(jù)進(jìn)行對(duì)比,結(jié)果吻合較好,驗(yàn)證了數(shù)值模型的可靠性、準(zhǔn)確性。以上饒市某一河道為例,基于FLOW-3D軟件建立了堤防決口水流模擬的三維數(shù)值模型,對(duì)立堵法、平堵法封堵決口進(jìn)行數(shù)值模擬,得到封堵過程中決口附近水位場(chǎng)和流速場(chǎng)分布規(guī)律。數(shù)值模擬結(jié)果顯示:該堤防決口進(jìn)口附近立堵法、平堵法塊石前水位壅高明顯,流速增大,最大水深分布在決口靠右位置,最大流速分布在決口靠左位置。根據(jù)決口附近流速分布規(guī)律,封堵時(shí)建議先對(duì)左側(cè)決口堤腳進(jìn)行裹頭處理,而后可考慮采用大粒徑塊石單體拋投以降低流速,再采取群體拋投方式進(jìn)占合龍。所用模擬方法和數(shù)值模型可為堤防搶險(xiǎn)及制定堤防決口封堵方案提供參考。
[Abstract]:The emergency rescue of levees should be based on the hydraulic characteristics of water flow, and the plugging method also directly affects the plugging efficiency.First, the flood course of the flow in the crevasse is simulated, and the results of water depth calculation are compared with the experimental data of Biscarini et al. The results are in good agreement, and the reliability and accuracy of the numerical model are verified.Taking a river course in Shangrao city as an example, based on FLOW-3D software, a three-dimensional numerical model of embankment flow simulation is established. The distribution law of water level field and velocity field near the crevasse is obtained by numerical simulation of water level field and velocity field in the course of sealing by opposing plugging method and horizontal plugging method.The numerical simulation results show that the water level in front of the block is obviously high, the velocity of velocity increases, the maximum water depth is distributed at the right position of the crevasse, and the maximum velocity of water is distributed at the left position of the crevasse by the vertical blocking method near the entrance of the dike crevasse.According to the distribution of velocity near the crevasse, it is suggested that the foot of the left side of the breakwater should be wrapped first, and then the mass throwing should be adopted to reduce the velocity of flow, and then the mass throwing should be adopted.The simulation method and numerical model can be used as a reference for dyke rescue and design of embankment closure scheme.
【作者單位】： 南昌大學(xué)建筑工程學(xué)院;中國人民武裝警察部隊(duì)水電第二總隊(duì);
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51269019,51469015) 廣東省水利科技創(chuàng)新基金資助項(xiàng)目(2014-08)
【分類號(hào)】：TV135;TV871

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1 曾秀娟;堤防決口封堵水力學(xué)數(shù)值模型研究[D];南昌大學(xué);2015年

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本文編號(hào)：1754973