摘要
高含沙河流汛期常常发生大水大沙的高含沙洪水,由于高含沙洪水的性质不同于一般挟沙水流,在涨洪过程中常常出现强烈的河槽冲刷。在这样的河流上,管道设计埋深是保障穿越工程安全的重要参数之一,它与河流的冲刷深度有关。在长输管道的穿跨越设计规范中,对河道的冲刷计算是沿用60年代初期铁道部门研究提出的“64—1”公式。从工程角度出发,根据高含沙水流特点,对高含沙洪水冲刷的计算方法进行了分析推导,并对几种常用计算方法进行了理论分析比较和实例资料检验。分析表明,“64—1”公式不适用于高含沙水流条件。提出的以张瑞谨起动流速公式为基础的冲刷计算方法,与实例资料吻合较好。
A full-loaded river frequently produces in wet season high peak discharge flow that carries a quite large amount of sediments. Such flow often causes very strong erosion on the river bottom during flood rising,since its behavior is different from ordinary silt carrying flow. Great probability of the erosion arising leads design buried depth to become one of important design parameters for long distance pipeline works to cut through the river in safety. However, the calculation about the scouring has still followed the design standard-'64-1' formula which was established in 1960's for the common circumstance of erosion. This paper, taking the distinguishing feature of hyperconcentration flood into account ,deduced approach to computing probable maximum eroded depth and studied the existing common calculations (including '64-1' formula) both in theoretical and practical cases as well. The conclusions drawn from the study are that '64-1' formula does not apply to the case of hyperconcentration flood and the Zhang Ruijing's initial velocity based approach which was proposed in this paper can fit the practical case well.
出处
《油气储运》
CAS
北大核心
2001年第4期23-27,共5页
Oil & Gas Storage and Transportation
关键词
油气管道
穿越工程
高含沙洪水
冲刷
冲深计算
公式
full-loaded river, hyperconcentration flood, probable maximum scouring depth, pipeline crossing engineering
