水利水电科技进展
水利水電科技進展
수이수전과기진전
ADVANCES IN SCIENCE AND TECHNOLOGY OF WATER RESOURCES
2014年
4期
57-61
,共5页
冰凌%开河流量%冰流密度%实体模型试验%包神铁路黄河大桥
冰凌%開河流量%冰流密度%實體模型試驗%包神鐵路黃河大橋
빙릉%개하류량%빙류밀도%실체모형시험%포신철로황하대교
ice%discharge at thawing period%ice flow density%physical model test%Baoshen Railway Bridge across Yellow River
为了研究包神铁路黄河大桥建成后在冰凌开河期对冰凌水体的壅高程度，基于冰流重力相似、冰流阻力相似、冰流量相似、浮冰运动相似等冰凌运动相似原理，采用添加少量石膏粉的石蜡作为模型冰，进行实体模型试验。试验结果表明：将模型冰块制作成不规则形状能够较好地模拟桥梁附近的卡冰现象；当开河流量为1200 m3/s、冰流密度为80%时，拟建桥梁、现状桥梁工况的上游水位壅高值分别为1.36 m和2.21 m；拟建桥梁的主跨比现状桥梁增加了近1倍，桥位断面排冰过流能力大大增强。
為瞭研究包神鐵路黃河大橋建成後在冰凌開河期對冰凌水體的壅高程度，基于冰流重力相似、冰流阻力相似、冰流量相似、浮冰運動相似等冰凌運動相似原理，採用添加少量石膏粉的石蠟作為模型冰，進行實體模型試驗。試驗結果錶明：將模型冰塊製作成不規則形狀能夠較好地模擬橋樑附近的卡冰現象；噹開河流量為1200 m3/s、冰流密度為80%時，擬建橋樑、現狀橋樑工況的上遊水位壅高值分彆為1.36 m和2.21 m；擬建橋樑的主跨比現狀橋樑增加瞭近1倍，橋位斷麵排冰過流能力大大增彊。
위료연구포신철로황하대교건성후재빙릉개하기대빙릉수체적옹고정도，기우빙류중력상사、빙류조력상사、빙류량상사、부빙운동상사등빙릉운동상사원리，채용첨가소량석고분적석사작위모형빙，진행실체모형시험。시험결과표명：장모형빙괴제작성불규칙형상능구교호지모의교량부근적잡빙현상；당개하류량위1200 m3/s、빙류밀도위80%시，의건교량、현상교량공황적상유수위옹고치분별위1.36 m화2.21 m；의건교량적주과비현상교량증가료근1배，교위단면배빙과류능력대대증강。
To study the effect by the Baoshen Railway Bridge to be built across the Yellow River on water level in thawing period, the physical model test has been applied according to similarities of ice flow gravity, ice flow resistance, ice flow volume, floating ice dynamics, using paraffin mixed with a little gypsum powder as model ice. The results show that the model ice with irregular shape can be used effectively to simulate blocking around the bridge. Additionally, under the conditions of 1200m3/s discharge and 80% ice flow density, backwater heights before the bridge to be built and the current bridge are 1.36 m and 2.21 m, respectively. Furthermore, the results also show that the bridge to be built has doubled main span compared to the current bridge, and therefore has stronger ice-passing ability.
