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黄土坡滑坡是三峡库区4个大型滑坡之一,因其典型性和重要性,“长江三峡库区地质灾害研究优势学科创新平台”在此建立了巴东野外大型综合试验场.野外试验场隧洞群揭露滑坡结构,有助于深入认识和研究黄土坡滑坡的地质结构特征和成因机制.通过试验隧洞开挖揭露黄土坡滑坡临江I号崩滑体特征发现:(1)临江I号崩滑体滑床基岩普遍发育层间剪切软弱夹层;(2)主隧洞与Ⅲ号支洞揭露滑体特征表明,滑体物质组成为棕红色泥岩、粉砂岩碎石土,灰色泥灰岩、灰岩碎石土,各类破碎岩层,滑体内潜水丰富,渗水量较大;(3)试验隧洞揭露滑带具有多层位顺层发育特征,平面范围与前人勘察成果较一致,厚度在不同剖面处存在较大差异;(4)深部钻孔监测资料显示,在土层与基岩面及层间剪切带均有蠕滑位移.分析得出:临江I号崩滑体是在重力和构造应力作用下顺多层软弱夹层、土层与基岩面发生蠕滑变形形成的,具有多层滑动面.
The Huangtupo landslide is one of four large landslides in the Three Gorges reservoir area. Due to its typicality and importance, the “Great Platform for the Study of Discipline of Geological Hazards in the Three Gorges Reservoir Area” has established a large-scale comprehensive test field in the Badong area. It is helpful to understand and study the geological structure and mechanism of Huangtupo landslide in the test tunnel tunnel group.Through the test of tunnel excavation to reveal the characteristics of the collapse and collapse of Linjiang I landslide in Huangtupo landslide, (2) The characteristics of the exposed bodies of the main tunnel and No. Ⅲ branch hole reveal that the composition of the slide body is brown red mudstone, siltstone and gravel soil, gray Marl, limestone and gravel soil, all kinds of broken rock layers, abundant diving in the slippery body, and large amount of seepage; (3) The test tunnel exposes the sliding belt to have multilevel bedding development features. The plane range is better than previous survey results (4) The data of deep borehole monitoring show that there is creep displacement in both the soil and bedrock surface and the interlaminar shear zone.It is concluded that the collapse of Linjiang I The sliding body is a multi-layered soft interlayer under the action of gravity and tectonic stress, Bedrock surface layer and occurrence of creep deformation is formed, having a multi-layered sliding surface.