元阳梯田滑坡泥石流灾害链致灾模式研究
RESEARCH ON THE DISASTER MODEL OF LANDSLIDE AND DEBRIS FLOW DISASTER CHAIN IN YUANYANG TERRACED FIELDS
李林 1陈安 1孔德彪 1和江宏 1杨子川 1徐继刘 2付俊3
作者信息
- 1. 昆明理工大学国土资源工程学院,昆明 650093
- 2. 云南铜业股份有限公司,昆明 650051
- 3. 同济大学土木工程学院,上海 200092
- 折叠
摘要
以元阳梯田滑坡泥石流灾害链为研究对象,以野外精细化调查为基础,结合室内试验模拟,对试验中滑坡泥石流演化过程和基质吸力变化进行分析,对灾害链致灾模式展开研究.试验共设置两种工况共3组试验,其中暴雨工况试验共进行了两次,挑选试验结果较好的一次工况进行分析,试验结论为灾害治理和区域减灾提供依据.研究结果表明,滑坡泥石流灾害链致灾过程极为复杂,降雨使得坡面碎石块大量出露之后,地表水流速也会逐渐降低,更有利于地表水入渗,梯田边坡受持续强降雨影响发生滑动后演化为泥石流继续沿梯田区运移,上部坡体形成巨大临空面,不稳定性增加,相比于持续暴雨而言持续中雨诱发坡体滑动所需时间更长,滑坡破坏力相比暴雨偏小,该灾害链致灾模式分为滑坡致灾和泥石流致灾,前者破坏力较大,后者影响范围较大,且不同区域致灾程度差别较大.
Abstract
Based on field investigation and laboratory simulation,the evolution process of landslide and debris flow and the change of matric suction were analyzed in the terraced fields of Yuanyang County,China,research on the disaster-causing model of disaster chain.Three groups of tests were carried out under two working conditions,among which the rainstorm test was carried out twice,and the one with better test results was selected for analysis.The results show that the process of landslide and debris flow disaster chain is very complex,and the surface water flow velocity will decrease gradually after the large amount of debris on the slope surface is exposed by rainfall,which is more advantageous to the infiltration of surface water,due to the continuous heavy rainfall,the slope of terraced field slides and then evolves into debris flow which continues to move along the terraced field,compared with the continuous heavy rain,the time of landslide induced by continuous moderate rain is longer,and the destructive force of landslide is smaller than that of heavy rain,the latter has a larger impact area,and the disaster-causing degree varies greatly in different regions.
关键词
强降雨/梯田边坡/灾害链/试验模拟/致灾过程Key words
heavy rainfall/terraced slope/disaster chain/experimental simulation/disaster-causing process引用本文复制引用
出版年
2023
NETL
NSTL
维普
万方数据