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

作　　者：李林 陈安[1] 孔德彪 和江宏 杨子川 徐继刘 付俊 LI Lin;CHEN An;KONG De-biao;HE Jiang-hong;YANG Zi-chuan;XU Ji-liu;FU Jun(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Copper Co.,Ltd,Kunming 650051,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[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

出　　处：《地质灾害与环境保护》2023年第4期20-27,共8页Journal of Geological Hazards and Environment Preservation

基　　金：《地质工程》教学案例库,云学位[2019]17号。

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。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 

分 类 号：P642.22[天文地球—工程地质学] P642.23[天文地球—地质矿产勘探] TU411[天文地球—地质学] TV131.61[建筑科学—岩土工程]