中国地质灾害与防治学报2024，Vol.35Issue(4)：1-12,12.DOI:10.16031/j.cnki.issn.1003-8035.202408001
梅大高速公路路基边坡失稳条件与滑坡机理初探
Study on the instability condition and landslide mechanism of subgrade slope in Mei-Da Expressway
摘要
Abstract
This paper presents a preliminary investigation of the instability and landslide of a road subgrade slope that occurred on May 1,2024 along Mei-Da Expressway.The investigation method is on the basis of past investigation results and findings about instability and landslide of road subgrade slopes in Hong Kong.The Mei-Da Expressway subgrade was constructed by cutting and filling on mountainous slopes.The landslide occurred at a fill slope along a gully.The fill soil was excavated from local soil of completely decomposed granite(CDG).The paper tests the particle size distribution and liquid and plastic limits of the three CDG soil samples that were excavated from adjacent natural slopes.It then examines the stability of the fill slope with a simplified geological slope model.It further investigates the catchments before and after the road construction.It then presents a possible mechanism for the slope instability and landslide.The field observations by others can confirm this mechanism.The cutting and filling of the hillside slopes significantly changed the runoff paths of the three natural catchments above the road.The road can intercept the runoff along the three gullies and direct all the runoff into the fill slope.The large volume of rainfall water can erode and liquefy the fills,which can cause the instability and landslide of the road subgrade slope.There is an urgent need to further investigate this mode of road subgrade instability and landslide since it is not uncommon.关键词
边坡稳定性/滑坡机理/山区公路/降雨/汇水盆地/跨流域调水Key words
slope stability/landslide mechanism/mountainous road/rainfall/catchment basin/water transfer across basins分类
天文与地球科学引用本文复制引用
岳中琦..梅大高速公路路基边坡失稳条件与滑坡机理初探[J].中国地质灾害与防治学报,2024,35(4):1-12,12.基金项目
国家自然科学基金项目(41372336) （41372336）
