瓤打曲泥石流运动特征及参数研究

苗晓岐

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铁道工程学报 ›› 2022, Vol. 39 ›› Issue (4) : 20-25.

长大干线：工程地质与路基

瓤打曲泥石流运动特征及参数研究

苗晓岐^**

作者信息 +

Research on the Movement Characteristics and Parameters of Debris Flow in Rangdaqu

MIAO Xiaoqi

Author information +

文章历史 +

摘要

研究目的: 瓤打曲泥石流沟位于藏东南复杂艰险山区,规划中的西藏某铁路建设跨越瓤打曲泥石流沟,研究该泥石流暴雨洪峰及冰崩涌浪作用下泥石流运动特征及流速、峰值流量、一次总量、一次最大堆积厚度、泥石流整体及块石冲击力等参数,从而为工程设置提供依据。
研究结论: (1)瓤打曲泥石流具备暴发大规模泥石流灾害的基本条件;(2)当冰川退缩至大于15°的冰川陡峭区容易发生冰崩涌浪,可能形成“冰崩涌浪-冰湖溢流-洪水-泥石流”的灾害链;(3)综合研究了瓤打曲暴雨泥石流及冰崩涌浪产生的泥石流两种工况下泥石流的容重、泥石流流速、峰值流量、泥石流整体冲击力、块石冲击力、一次总量和一次最大堆积厚度等工程设置需要的参数;(4)本文研究可为藏东南峡谷区冰崩涌浪产生的泥石流运动参数的分析计算提供借鉴。

Abstract

Research purposes: The mud-rock flow ditch of Ruandaqu is located in the complex and dangerous mountainous area in southeast Tibet. The construction of a railway in Tibet is under planning to cross the mud-rock flow ditch. The parameters such as the movement characteristics and flow velocity of debris flow, peak flow, volume, the maximum accumulation thickness at a time, the impact force of overall debris flow and block stone under the action of rainstorm peak and ice avalanches swells are studied, to provide the basis for the project setting.
Research conclusions: (1) The mudslides in Rangdaqu have the basic conditions for the formation of large-scale debris flow disasters; (2) When the glacier retreats to the steep area of the glacier greater than 15°, it is prone to ice avalanche swells, which may form the disaster chain of "ice avalanche swells-glacial lake overflow-flood-debris flow"; (3) The parameters required for engineering settings such as bulk density of debris flow, debris flow velocity, peak flow, overall impact force of debris flow, rock impact force, total volume and maximum accumulation thickness of debris flow under the two working conditions of debris flow caused by heavy rain and ice avalanche swell are comprehensively studied; (4) The research result can provide reference for the analysis and calculation of the motion parameters of debris flow generated by ice avalanches and swells in the canyon area of southeastern Tibet.

导出引用

苗晓岐. 瓤打曲泥石流运动特征及参数研究[J]. 铁道工程学报, 2022, 39(4): 20-25

MIAO Xiaoqi. Research on the Movement Characteristics and Parameters of Debris Flow in Rangdaqu[J]. Journal of Railway Engineering Society, 2022, 39(4): 20-25

中图分类号： U212.22 U212.35

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