岩土工程学报2024，Vol.46Issue(6)：1136-1145,10.DOI:10.11779/CJGE20230090
裂隙优势流入渗诱发堆积层滑坡浅层破坏机理研究
Mechanism of fracture preferential flow infiltration-induced shallow damage of colluvial landslides
摘要
Abstract
Soil fissures provide infiltration channels for rainfall,and the dominant flow formed along these channels dominates the infiltration process of rainfall,leading to the gradual deterioration of landslide stability and the continuous development of deformation.Taking Xuwa landslide as an example,the geological survey,on-site macroscopic inspection and monitoring data are combined.By analyzing the deformation characteristics of Xuwa landslide,the phenomenon of shallow landslide damage induced by dominant inflow infiltration is elaborated,and numerical simulation is used to analyze the process of dominant inflow infiltration caused by fissures at different depths.Thus,the stability evolution characteristics of shallow landslide under the action of dominant inflow are calculated by the infinite slope model,and the mechanism of shallow damage induced by the dominant flow infiltration is clarified.The study shows that:(1)The fissures improve the permeability and deformation of the slope as well as the promoted fissure development,and the shallow damage is often caused by the continuous evolution of the surface tension fissures generated by landslide deformation.(2)The fissures change the infiltration process of rainwater,part of which infiltrates vertically downward along the surface of the slope,part of which infiltrates along the fissures to the end of the fissures and spreads around,and with the development of fissures,the infiltration of rainfall is dominated by the dominant flow of fissures.(3)The relationship between landslide deformation and fissure development is close.When there is no fissure,the slope is only in an unstable state,characterized by surface erosion damage,while with the evolution of a fissure,the slope is in an unstable state within the depth of fissure influence,manifesting a sliding damage,and the temporary saturation area at the end of the fissure is the most dangerous slide surface.关键词
堆积层滑坡/优势流入渗/失稳机理/变形特征/浅层破坏Key words
colluvial landslide/preferential flow/instability mechanism/deformation characteristic/shallow damage分类
建筑与水利引用本文复制引用
黄晓虎,魏兆亨,易武,郭飞,黄海峰,肖宇煌..裂隙优势流入渗诱发堆积层滑坡浅层破坏机理研究[J].岩土工程学报,2024,46(6):1136-1145,10.基金项目
三峡库区地质灾害教育部重点实验室(三峡大学)开放基金项目(2022KDZ16) （三峡大学）
国家青年科学基金项目(42007237) （42007237）
国家自然科学基金面上项目(42172303) （42172303）
