成仁高速红层分布区开挖边坡变形特征及机制

四川盆地红层分布广泛，其特殊的工程特性常导致严重的地质灾害。通过分析成仁高速文宫连接线边坡的变形破坏特征，得出边坡在开挖和降雨的影响下破坏机制为蠕滑-拉裂。进一步用FLAC3D进行数值分析，显示开挖卸荷和降雨影响导致滑坡灾害，其后缘发生拉裂破坏，并引发滑坡前部发生剪切滑移破坏。针对该类型的边坡，开挖后应对路堑以上部分及时采取加固措施，避免降雨入渗软化土体，加剧滑坡变形破坏。 

Deformation characteristics and mechanism of an excavation slope in red bed area of Chengren highway

The special engineering properties of the red beds which distribute extensively in Sichuan basin often result in serious geological disasters. Through the characteristic analysis of deformation and destruction of the slope in the connection line between Wengong town and Chengren Highway, failure mechanism of the slope under the influence of excavation and precipitation is concluded as creep-sliding and fracturing. Further by FLAC3D numerical analysis, the deformation and failure mechanism of slope were verified. The results point out that cracking damage at the trailing edge as well as the shear slip failure at the front of landslide were caused by the excavation unloading and rainfall. For this type of slope, reinforcement measures should be taken in time in the part above the cutting slope after excavation to prevent rainfall infiltration from softening the soil and intensifying deformation and failure of the landslide.