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拦砂坝溢流口过流能力的大小是工程设计中的关键参数之一,也是影响坝体安全的重要设计参数。结合泥石流过流特点,分析推导了拦砂坝溢流口过流能力的参数计算式;在此基础上,通过水槽实验建立了流量系数的经验公式。水槽实验表明,溢流口过流能力随泥石流密度的增大而减小,随沟道坡度的增大而增大,随相对沟道宽度的增大而增大,溢流口位置与沟道中心相对者大,溢流口位置与沟道中心偏离者小。与现有计算方法相比,所提通过理论推导和水槽实验建立起的拦砂坝溢流口过流能力参数计算式,计算结果更为精确可靠,可用于泥石流拦砂坝溢流口设计时的过流能力验算。
The size of overcrossing capacity of the overflow dam of the sand bar is one of the key parameters in engineering design and is also an important design parameter affecting the safety of the dam. Combined with the characteristics of debris flow, the calculation formula of the over flow capacity of the overflow gate was analyzed and deduced. Based on this, the empirical formula of flow coefficient was established through the experiment of sink. Sink experiments show that the overflow capacity of the overflow decreases with the increase of the debris flow density, increases with the slope of the channel, increases with the increase of the relative channel width, The center of the relative large, overflow port position and channel center deviate from small. Compared with the existing calculation methods, the formulas for calculating the over-flow capacity parameters of the overflow spillway which are established by the theoretical derivation and the sink experiment are provided. The calculation results are more accurate and reliable and can be used in the design of the overflow port of the debris flow dam Overcurrent ability checking.