复杂水流条件下抛石漂移距离的试验研究

发布时间：2018-09-03 09:55

【摘要】：抛石漂移是河道治理、护岸、潜丁坝、桥墩防冲等实际工程中经常遇到的问题,依托长江南京以下12.5 m深水航道二期工程口岸直水道整治工程,针对抛石漂移距离在试验室水槽内开展了一系列物理模型试验,对水深、流速、抛高、块石质量及块石形状的不规则等因素对抛石漂距的影响进行了研究;同时在考虑水流流速垂向分布的基础上,通过块石在动水中的受力分析推导出水上抛石漂移距离计算公式,利用模型试验结果拟合出公式中各系数的值,并将其计算结果与模型试验数据和现场观测数据进行比较,结果吻合较好,验证了公式的合理性。
[Abstract]:Riprap drift is a common problem in practical projects such as river channel regulation, bank protection, submersible dike, bridge pier anti-scour and so on. Relying on the second phase of the deep-water channel project of 12.5 m below Nanjing of the Yangtze River, the port direct waterway regulation project is relied on. A series of physical model tests were carried out on the drift distance of ripraps in the laboratory flume. The effects of water depth, velocity of flow, throwing height, mass of block and irregular shape of rock mass on the drift distance of riprap were studied. At the same time, on the basis of considering the vertical distribution of the flow velocity, the formula for calculating the drift distance of the rock in the moving water is derived through the force analysis of the block rock in the moving water, and the values of the coefficients in the formula are fitted by the model test results. The calculation results are compared with the model test data and the field observation data, and the results are in good agreement with each other, which verifies the rationality of the formula.
【作者单位】：长沙理工大学水利工程学院;中交天津航道局有限公司;
【基金】：国家重点研发计划项目(2016YFC0402108) 国家自然科学基金项目(51309038)
【分类号】：TV85;U617

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