沉积与特提斯地质2025，Vol.45Issue(3)：659-670,12.DOI:10.19826/j.cnki.1009-3850.2024.11002
川西南红层区浅层土质滑坡特征和失稳模式研究
Study on disaster characteristics and instability mode of shallow soil landslide in red bed area of southwest Sichuan Province
摘要
Abstract
The red bed develope in southwestern Sichuan,and the shallow soil landslides in red bed area exhibit characteristics of cluster occurrences,large quantities,and great hazards.Taking Xide County of Liangshan Prefecture as the research area,deformation and failure characteristics,physical and mechanical characteristics and instability modes of shallow soil landslides in southwestern Sichuan are studied by means of mathematical statistics,engineering geological surveys,drilling,trench exploration,as well as soil physical and mechanical tests.Statistical analysis was conducted on the characteristics of landslide development in 5 aspects:thickness,scale,slope,profile form,and slope structure.The landslides demonstrate features of shallow surface sliding to flow failure and multi-stage sliding.Additionally,the accumulation body is in a state of high water saturation and has obvious hierarchy.The decay law of material composition and shear strength of residual slope soil in the red bed is revealed.The dominant particle sizes of the soil are concentrated in 2-5mm and 0.075-0.25 mm ranges.As water content increases,cohesion briefly rises to a peak and then continuously decreases,while the internal friction angle decreases continuously.With increasing saturation time,both cohesion and internal friction angle exhibit a continuous decreasing trend.Combined with landslide examples,three instability models of red bed soil landslides in complex terrain are extracted.The research results can provide data support for disaster prevention and mitigation in southwestern Sichuan and provide reference for improving the targeted prevention and control capability of mass disasters in red bed areas.关键词
红层地区/浅层土质滑坡/变形破坏特征/强度衰变规律/失稳模式Key words
red bed area/shallow soil landslide/deformation and failure characteristics/intensity attenuation law/instability mode分类
天文与地球科学引用本文复制引用
徐伟,冯文凯,霍柱北,易小宇,白慧林,田凯..川西南红层区浅层土质滑坡特征和失稳模式研究[J].沉积与特提斯地质,2025,45(3):659-670,12.基金项目
国家自然科学基金(U2005205) （U2005205）
中国地质调查局项目(DD20221746,DD20251300215) （DD20221746,DD20251300215）
四川省自然科学基金(2023NSFSC0286) （2023NSFSC0286）
四川省自然资源厅项目(KJ-2023-012) （KJ-2023-012）
