研究目的:巴南广高速公路位于地形地貌平缓、基岩产状近水平、构造相对简单的川东红层地区,线路修建时滑坡病害频发,其中工程造价超过10万元的滑坡达192处,工程治理费用约4亿元,严重影响了高速公路的正常建设。基于此,笔者依据咨询的这192处滑坡建立样本数据库,对滑坡高发的成因进行分析,以期能为今后类似红层区的高速公路的安全、经济修建提供借鉴。研究结论:(1)以富水粉质粘土为主的堆积体滑坡是项目区滑坡主要类型,且以小-中型滑坡为主,滑坡密度大,治理费用高,这是项目区滑坡的主要特征。(2)红层区特殊的地质环境是滑坡高发的基础,主要体现在地表广泛分布的可塑-软塑状粉质粘土和下伏的富水砂泥岩地层对工程扰动敏感,易使坡体在开挖卸荷和填方加载后,利用土岩交界面和最大剪应力形成的同生滑面产生堆积层滑坡、在近水平产状的砂泥岩中形成平推式、错落式和破碎岩质滑坡。(3)欠合理的设计对滑坡高发具有控制作用,主要体现在地质选线贯彻较差,路基填挖规模偏大而使坡体防护工程针对性差,造成大量工程滑坡的出现,且处治设计周期过长,使滑坡范围不断扩大。(4)施工方责任心欠缺,不合理的工程开挖或填方是滑坡高发的重要因素。 Research purposes: The Bannan-Guangrao Expressway is located in a gentle topography with near-horizontal bedrock occurrence and relatively simple structure of red beds in the eastern part of Sichuan Province. There are frequent landslide hazards when the line is constructed. Among them, there are 192 landslides whose construction cost exceeds 100,000 yuan , Project management costs about 400 million yuan, seriously affected the normal construction of the expressway. Based on this, the author based on consulting these 192 landslides to establish a sample database to analyze the causes of the high incidence of landslides, with a view to providing reference for the future safety and economic construction of expressways with similar red beds. Research conclusions: (1) Landslides, mainly composed of silty clay, are the main types of landslides in the project area, dominated by small-medium landslides, with large landslide densities and high treatment costs, which are the main features of landslides in the project area. (2) The special geological environment in the red layer area is the foundation of high landslide, which is mainly reflected in that the plastic-soft plastic silty clay and the underlying water-rich sandstone and mudstone strata widely distributed on the surface are sensitive to the disturbance of the project, After excavation unloading and filling, the landslides of landslides are produced by the syn-originated landslides formed by the interface of the earth and rock and the maximum shearing stress, forming the push-push, scattered and broken rock in the sand-mudstone near the horizontal formation landslide. (3) Owing to the reasonable design, it has control effect on the high landslide, which is mainly reflected in the poor implementation of geological alignment, the large scale of embankment excavation and the poor pertinence of slope protection engineering, resulting in a large number of engineering landslides, and the design cycle Too long, so that the scope of landslides continue to expand. (4) The construction side has a lack of responsibility and irrational excavation or filling of the project is an important factor in the high incidence of landslides.