| 降雨模式对震后泥石流起动模式影响的试验研究: 以九寨天堂沟为例 |
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| 引用本文： | 刘世康,范宣梅,王文松,魏振磊,杜三林,郭劲松.降雨模式对震后泥石流起动模式影响的试验研究: 以九寨天堂沟为例[J].地质科技通报,2022,41(6):278-286. |
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| 作者姓名： | 刘世康 范宣梅 王文松 魏振磊 杜三林 郭劲松 |
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| 作者单位： | 1.成都理工大学环境与土木工程学院, 成都 610059 |
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| 基金项目： | 华能集团总部科技项目"冰雪灾害链对雅下水电工程影响评价与未来风险预测研究" |
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| 摘 要： | 降雨过程中降雨强度的变化会影响土体渗透率及饱和过程, 从而改变土体的力学性质, 影响泥石流起动模式及破坏规模。为探究不同降雨模式对震后泥石流起动机制的影响, 自制了小比例模型槽, 结合可控雨型的降雨模拟系统, 进行了人工降雨诱发泥石流的室内模型试验; 基于不同降雨模式下泥石流的起动过程分析, 对坡体内部含水率和孔隙水压力的变化规律进行了研究。研究结果表明: 递增型降雨模式下泥石流发生突然, 呈整体滑坡转化为泥石流起动模式, 坡体破坏规模最大; 递减型降雨模式下表现为后退式溃散失稳起动模式; 均匀型降雨模式下则表现为溯源侵蚀起动模式; 中峰型降雨模式下以局部滑坡转化为泥石流起动模式; Ⅴ型降雨模式下则由坡面侵蚀加剧转化为泥石流启动模式, 破坏规模最小。研究结果可以为九寨沟地区泥石流的预报预警提供参考。
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| 关 键 词： | 降雨模式 泥石流 物理模型试验 含水率 |
| 收稿时间： | 2022-03-18 |
Experimental study on the effect of rainfall patterns on the failure mode of debris flows after earthquakes: A case study of Tiantanggou,Jiuzhai |
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| Affiliation: | 1.College of Environment and Civil Engineering, Chengdou 610059, China2.Huaneng Xizang Hydropower Safety Engineering Technology Research Center, Tibet 850000, China |
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| Abstract: | Variable rainfall intensity can influence soil permeability and saturation processes, change the mechanical properties of soil, and affect the initiation mode and damage scale of debris flows. To explore the response mechanism of debris flows under different rainfall modes after earthquakes, laboratory tests of artificial rainfall-induced debris flows was performed through a small-scale model trough and rainfall simulation system. Based on the starting process of debris flow under different rainfall patterns, the variation of water content and pore water pressure in the slope was studied. The results show that the landslide transforms to a debris flow under the increasing rainfall model, and the damage scale of the accumulation is the largest; the debris flow under the decreasing rainfall occurs after the backward breaking instability; the initiation of debris flow under uniform rainfall mode results from traceable erosion; local landslides are transformed into debris flows under the middle-peak rainfall pattern; under the Ⅴ-shaped rainfall pattern, the slope erosion is intensified and transformed into debris flow, with the smallest damage scale.The research results can provide reference for the forecast and warning of debris flow in Jiuzhaigou area. |
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