摘要
黄土坡滑坡是三峡库区地质条件最复杂的滑坡之一,因巴东县城在历史搬迁过程中曾坐落于该滑坡体上而备受关注。为揭示对黄土坡滑坡起控制作用的临江1号滑坡滑带空间分布和工程性质规律,根据野外大型试验场隧洞群直接揭露,结合钻孔、室内试验和现场监测手段,对滑带空间分布、厚度、物质组成、物理力学性质和变形规律等方面进行了研究,获得了较系统全面的创新成果。研究结果表明:临江1号滑坡中存在双层滑带,下层主滑带呈南高北低东高中低状,位置靠近滑坡东部;次级滑带靠近滑坡西部;临江1号滑坡主滑带物理力学参数在空间分布上呈现不均一性,滑带强度的黏聚力和内摩擦角值随着滑坡主滑方向从后缘到前缘呈递增趋势,而滑带中的黏粒和粉粒含量随着滑带从后缘到前缘的延伸同样有所增长。临江1号滑坡次级滑带变形速率受控于滑带分布,前缘滑带变形速率明显大于后缘速率。滑带变形响应随滑带位置不同受外界因素影响程度各异,前缘受库水位升降显著影响,中后部滑带变形主要受降雨影响。
Huangtupo landslide,geologically one of the most complicated landslides in the Three Gorges Reservoir area,attracted much attention for being the old site of Badong county. To reveal the true condition of the spatial distribution,mechanical behavior and deformation properties of slip zone in Sub-landslide 1#,the major and controlling part of Huangtupo landslide,a large-scale investigation tunnel group,combined with boreholes,tests and in-situ monitoring are applied to study the spatial distribution,thickness,formation,physical properties and deformation rules of slip zone. Relatively systematic and comprehensive innovations are obtained during the study.The results show that there are two slip zones in the upper and lower part of Sub-landsldie 1#. The major lower slip zone is located at the eastern part of Sub-landsldie 1#,with the elevation decreasing along the main sliding direction. The elevation is lower in the middle and higher in the eastern part. In addition,the spatial distribution of strength parameters show the trend of increasing along the main sliding direction from the edge to front part. The trend also shows in the content change of clay and silt particles along the main sliding direction. As to thedeformation distribution,the slip zone at the landslide toe creep slower than the middle edge part of landslide. The deformation response shows spatial svariation to the external influencing factor water level and rainfall.
出处
《工程地质学报》
CSCD
北大核心
2018年第1期129-136,共8页
Journal of Engineering Geology
关键词
黄土坡滑坡
野外大型试验场
滑带
空间分布
Huangtupo landslide
Large-scale investigation tunnel group
Slip zone
Spatial distribution
