圓柱橋墩清水局部沖刷透水三桿架體防護(hù)特性試驗(yàn)研究
發(fā)布時間：2018-11-27 19:34
【摘要】：鑒于透水三桿架體在護(hù)岸工程應(yīng)用中表現(xiàn)出的較好防護(hù)效果,通過變坡水槽試驗(yàn)研究了圓柱橋墩采用透水三桿架體防護(hù)后行近流速、行近水深、布設(shè)密度、沖刷歷時等特征因素對防護(hù)效果的影響,并分析了透水三桿架體的防護(hù)特性及最優(yōu)設(shè)計防護(hù)范圍。結(jié)果表明,布設(shè)密度相同時橋墩前最大沖深隨流速和水深的增加而增大,水流條件不變時增加布設(shè)密度能有效縮減橋墩周圍最大沖深;透水三桿架體桿件體積率大于0.229后水流條件和布設(shè)密度的變化均不能影響防護(hù)效果;透水三桿架體能有效減緩沖刷進(jìn)程,沖刷歷時最大可增至無防護(hù)時的3.28倍;最優(yōu)設(shè)計防護(hù)范圍可在不同布設(shè)密度時透水架體防護(hù)下的最大沖刷范圍和2.8倍墩徑之間選取。
[Abstract]:In view of the good protective effect of the permeable three-bar frame in the application of bank protection engineering, this paper studies the near velocity, depth and density of the cylindrical bridge piers protected by the permeable three-bar frame through sloping flume test. The effect of the characteristic factors such as scour duration on the protective effect is analyzed. The protective characteristics and the optimum design range of the permeable three-bar frame are analyzed. The results show that the maximum impact depth increases with the increase of flow velocity and water depth when the layout density is the same, and the maximum impact depth around the pier can be effectively reduced by increasing the layout density when the water flow condition is constant. The change of water flow condition and arrangement density can not affect the protective effect after the volume ratio of permeable three-bar frame is greater than 0.229, and the permeable three-bar frame can effectively slow down the scouring process, and the maximum scour duration can be increased to 3.28 times of that without protection. The optimal design protection range can be selected between the maximum scour range and 2.8 times pier diameter under the protection of permeable frame with different density.
【作者單位】： 南通航運(yùn)職業(yè)技術(shù)學(xué)院交通工程系;南通市水利勘測設(shè)計研究院有限公司;河海大學(xué)水利水電學(xué)院;
【基金】：交通運(yùn)輸部應(yīng)用基礎(chǔ)研究項(xiàng)目(2013329284210) 江蘇省高�！扒嗨{(lán)工程”中青年學(xué)術(shù)帶頭人培養(yǎng)計劃 江蘇省交通科學(xué)研究計劃項(xiàng)目(2013Y27-04) 南通市社會事業(yè)科技創(chuàng)新與示范計劃(HS2012014)
【分類號】：U443.8
本文編號：2361825
[Abstract]:In view of the good protective effect of the permeable three-bar frame in the application of bank protection engineering, this paper studies the near velocity, depth and density of the cylindrical bridge piers protected by the permeable three-bar frame through sloping flume test. The effect of the characteristic factors such as scour duration on the protective effect is analyzed. The protective characteristics and the optimum design range of the permeable three-bar frame are analyzed. The results show that the maximum impact depth increases with the increase of flow velocity and water depth when the layout density is the same, and the maximum impact depth around the pier can be effectively reduced by increasing the layout density when the water flow condition is constant. The change of water flow condition and arrangement density can not affect the protective effect after the volume ratio of permeable three-bar frame is greater than 0.229, and the permeable three-bar frame can effectively slow down the scouring process, and the maximum scour duration can be increased to 3.28 times of that without protection. The optimal design protection range can be selected between the maximum scour range and 2.8 times pier diameter under the protection of permeable frame with different density.
【作者單位】： 南通航運(yùn)職業(yè)技術(shù)學(xué)院交通工程系;南通市水利勘測設(shè)計研究院有限公司;河海大學(xué)水利水電學(xué)院;
【基金】：交通運(yùn)輸部應(yīng)用基礎(chǔ)研究項(xiàng)目(2013329284210) 江蘇省高�！扒嗨{(lán)工程”中青年學(xué)術(shù)帶頭人培養(yǎng)計劃 江蘇省交通科學(xué)研究計劃項(xiàng)目(2013Y27-04) 南通市社會事業(yè)科技創(chuàng)新與示范計劃(HS2012014)
【分類號】：U443.8
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1 杜兵;;移動式腳手架[J];工程力學(xué);1985年03期
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