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DOI:
工程科学与技术:2009,41(3):165-171
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泥石流弯道超高与流速计算关系的研究——以巴塘通戈顶沟地震次生泥石流为例
(中国科学院 山地灾害与地表过程重点实验室,四川 成都 610041)
Research on the Relationship between the Calculation of Debris flow Velocity and Its Super Elevation in Bend
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中文摘要: 我国山区尤其是地震山区暴发众多的泥石流, 泥石流的流速计算始终是一个科学难题。对于在弯道运动的泥石流,假设凹凸两岸角速度相等,可以利用动能与势能的平衡及速度关系,计算泥石流的流速。据观测,在泥石流的弯道运动中,凹凸两岸的角速度并不相等,所以利用角速度相等得出的流速与真实情况有一定的误差。在角速度不等的基础上,依据流体力学基本方程和泥石流的弯道运动的基本特征,推导泥石流弯道运动超高现象与流速关系的基本方程,利用实地调查的泥深及弯道断面特征计算弯道泥石流流速,并对弯道角速度相等或不等的流速计算方法和结果进行比较,得出采用用角速度假设计算更为合理的结论。同时,还提出了根据泥石流弯道流速推算沟床糙率的计算方法,并将该计算糙率应用与直道流速计算,以验证泥石流沟道的整体流速计算的合理性。将本方程应用于川藏公路四川段通戈顶地震次生泥石流沟,分析结果证明按沟道凹凸两岸角速度不等计算,流速沿沟床断面并非直线分布,泥深为一条近似的抛物线分布,而且流速计算数值较角速度相等情况下偏小,这与野外观测的泥石流弯道运动的特征更为接近。
中文关键词: 弯道超高  泥石流  流速  沟床糙率
Abstract:Debris flow velocity can be calculated through the dynamic and potential energy or the relationship between line speed and radius as the debris flow moving in a bend channel. A practical formula of super elevation in bend based on the theory of unequal angle speeds and hydromechanics was put forwars. The bend bed roughness parameter can be gotten through velocities and experiential theories. The velocities of straight channels also can be gotten by the roughness parameter. The calculation of Tonggeding debris flow velocity and its distribution showed that the results by two models above are very close. Indeed for the “unequal velocity model”, the calculated mud line distributed with a parabola shape, which is more close to the reality. The velocity from “unequal velocity model” is a little lower than that of calculated by “equal velocity model”
文章编号:20090323     中图分类号:    文献标志码:
基金项目:国家科技支撑资助项目(2006BAJ06B02-5)
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引用文本:
陈宁生,杨成林,李战鲁.泥石流弯道超高与流速计算关系的研究——以巴塘通戈顶沟地震次生泥石流为例[J].工程科学与技术,2009,41(3):165-171.
.Research on the Relationship between the Calculation of Debris flow Velocity and Its Super Elevation in Bend[J].Advanced Engineering Sciences,2009,41(3):165-171.