青藏高原堆积层斜坡的滑坡特征及处治措施研究

以青海省S101省道K359+881~+929段滑坡处治工程为例，分析高原堆积层斜坡的结构特征、稳定性因素对滑坡的控制效应和诱发模式。总结了目前各类滑坡防治措施对高寒地区滑坡的适宜性。结合地质综合分析和数值模拟，论述了斜坡的滑坡机理及时空演化过程。研究表明:青海省道K359+881~+929段堆积层斜坡受到岩土体性质、坡体结构及水热变化过程等因素的影响，在冻融作用下堆积体持续蠕动，暴雨入渗使堆积体沿基覆面整体滑动，形成浅、深两层滑坡。微型桩具有柔性变形卸载特性，是一类可以优先选择的寒区滑坡支挡措施。

Study on Geological Characteristics of Colluvial Landslide on Qinghai—Tibet Plateau and the Control Measures

Taking the landslide control works in K359+881~+929 Section of Provincial Highway S101 in Qinghai as an example, the structural characteristics of colluvial slope on plateau, as well as the control effect of the stability factors on the landslide and the induction mode thereof, were analyzed; then the adaptability of every current control measures for the landslide in alpine region was summarized. In combination with comprehensive geological analysis and numerical simulation, the landslide mechanism and its time-space evolution process were discussed. The results of the reaearch show that, the colluvial slope along K359+881~929 Section of the Qinghai Provincial highway, which is affected by the factors, including rock-soil mass properties, slope structure and hydro-thermal change, keeps creeping under the action of freeze-thaw cycles and slides as a whole on the bedrock surface caused by heavy rain infiltration, thus shallow and deep seated landslide are formed. Micropile, featured by flexible deformation unloading,is rather a preferred retaining structure for landslide in cold regions.