中国地质灾害与防治学报2025，Vol.36Issue(6)：23-36,14.DOI:10.16031/j.cnki.issn.1003-8035.202503032
董志塬地区降雨诱发型黄土流滑的发育特征与成因机制分析
Development characteristics and genetic mechanism analysis of rainfall-induced loess flowslides in the Dongzhiyuan area
摘要
Abstract
Under extreme rainfall conditions,loess flowslide is widely developed in the loess plateau.Loess flowslides refer to a type of geohazard involving a combination of"flow"and"slide"movements occurring in the unsaturated surface loess on slopes.These events are characterized by their high frequency,shallow failure depths,and widespread distribution.The sliding mass typically exhibits high moisture content and plastic flow behavior,and may evolve into more hazardous and destructive loess mudflows,posing significant threats to life and property in loess regions.In this paper,the rainfall-induced loess flowslide in Qingyang Dongzhiyuan area is taken as the research object.Based on field investigation and UAV survey,80 detailed flowslide cases were documented and analyzed to summarize their spatial distribution and developmental characteristics.A slope stability evaluation model for unsaturated loess slope was established using the infinite slope model.The results indicate that:(1)Rainfall-induced loess flowslides in the Dongzhiyuan area can be divided into five types:landslide accumulation flowslide,vegetation cover loess flowslide,gully lateral erosion loess flowslide,monomer flowslide,and group flowslide.Group flowslides can be further subdivided into parallel and convergent types based on the relative location of their source areas.(2)These flowslides are generally small in scale due to the terrain constraints of Dongzhiyuan area,often exhibiting low mobility and limited travel distance,making them significantly different from irrigation-or earthquake-induced loess flowslides.(3)A stability evaluation model for vegetation-covered loess slope under unsaturated conditions is proposed,along with integrated mitigation strategies combining engineering,biological,and chemical approaches.These findings offer valuable insights for the prediction of slope stability under rainfall conditions and for the early warning and mitigation of loess flowslide hazards.关键词
董志塬/黄土/流滑/斜坡稳定性/降雨Key words
Dongzhiyuan/loess/flowslide/slope stability/rainfall分类
天文与地球科学引用本文复制引用
朱佳豪,朱兴华,张卜平,冯笑瑞,吴浩天..董志塬地区降雨诱发型黄土流滑的发育特征与成因机制分析[J].中国地质灾害与防治学报,2025,36(6):23-36,14.基金项目
国家自然科学基金项目(42090053 （）
42377163) （）
陕西省重点研发项目(2023-ZDLSF-61) （2023-ZDLSF-61）
中央高校基金项目(300102264912) （300102264912）
