地球物理工作在地质灾害调查中的作用逐渐凸显, 特别在西藏等高海拔地区, “为大地做CT”来检测区域地质灾害清醒便捷可靠; 本次工作在西藏隆子县开展地面高密度电法剖面测量, 进行地层划分, 结合野外调查和钻探资料, 准确解译异常体位置、形状、规模及埋深等, 查明目标区域特殊地质体位置及延伸方向; 本次工作①通过物性测量将工作区主要地层分为3个电性层, 即低阻层 (冲洪积扇粘土、亚粘土; 冲洪积卵砾石) 、中低阻层 (碎石土; 下层角砾土; 强风化板岩) 、中高阻层 (表层角砾土; 中等风化硅质岩) ; ②结合地面调查、钻探编录等资料进行了综合解译, 分析了剖面深部地球物理特征, 并根据异常形态和特征进行了地层划分; ③高密度反演解译结果表明, 玉麦-桑曲村公路Ⅳ滑坡表层为干燥、孔隙度大的角砾土层, 中上部为湿润的角砾土层, 基岩为中~强风化构造混杂岩, 滑动面为基覆面, 滑动面深度0~20m。本次工作初步查明滑坡体内部物质结构, 为全面筛查工作区地质灾害隐患情形, 查明工作区范围内地质灾害潜伏区域的分布、发育特征和危害程度提供依据。

The role of geophysical work in geological disaster investigation has gradually become more and more prominent, especially in high-altitude areas such as Tibet, "CT for the earth" to detect regional geological disasters is convenient and reliable; In this work, high density electrical profile survey was carried out in Longzi County, Xizang Autonomous Region to divide strata. The location, contour, scale and burial depth of anomalous bodies were accurately interpreted in combination with field investigation and drilling data, and the location and extension direction of special geological bodies in the target area were identified. In this work, ① the main strata in the working area are divided into three electrical layers by physical property measurement, namely, low resistivity layers (alluvial fan clay, subclay; Alluvial gravel) , mediumto- low resistance layer (gravel soil; Lower breccia soil; Highly weathered SLATE) , medium-to-high resistivity layer (surface breccia soil; Moderately weathered siliceous rock) ; (2) Combined with the ground survey, drilling records and other data, the deep geophysical characteristics of the section are analyzed, and the stratigraphic division is carried out according to the abnormal morphology and characteristics; (3) Highdensity inversion interpretation results show that the surface layer of landslide Ⅳ in Yumai-Sangqucun Road is dry breccia soil layer with large porosity, the middle and upper part is wet breccia soil layer, the bedrock is medium-strong weathered structural melange, and the sliding surface is the base covering surface with a depth of 0~20 meters. This work preliminarily identified the internal material structure of the landslide, providing a basis for comprehensively screening the hidden geological disaster situation in the working area, and identifying the distribution, development characteristics and harm degree of the geological disaster latent area within the work area.