三峡库区泄滩滑坡滑带土特征研究

在滑坡地质灾害勘察过程中,如何准确地辨识滑带土的特征和确定滑动面的具体位置,是让大多数工程技术人员都感到头痛的问题。本文以三峡库区泄滩古滑坡为例,较为详细地介绍了泄滩滑坡滑体的结构特征,以及通过勘探平硐、钻孔岩芯和地表露头等多种手段揭露的滑带土的基本特征。研究结果表明,泄滩滑坡滑带土中不仅可见明显的擦痕、镜面以及碎块石印模,而且在个别钻孔可见滑带土呈糜棱岩化现象,地表露头还可见到滑带土在地下水和高速下滑过程中被碾压、搓揉原有结构被破坏后又重新胶结的痕迹。同时,在滑带以下还存在一层特殊的滑坡影响带。泄滩滑坡滑带土特征非常典型,具有一定的代表性,可供同行在实际工作中确定滑面时参考。

STUDY ON SOIL PROPERTIES IN SLIDING ZONE OF XIETAN LANDSLIDE ON THE THREE-GORGES RESERVOIR

How to determine the properties of soil sliding zone and the location of sliding plane accurately in the course of landslides investigation is a difficult problem. The structural features of landslide body and soil properties in sliding zone of Xietan landslide on Three-Gorges Reservoir are introduced in this paper. Stria, mirrors and casts of gravels can be clearly bound in soil of sliding zone of Xietan landslide, and even mylonitic and re-cementation of soil can be also found in the sliding zone. Furthermore, landslide-influenced zone was observed under the sliding zone of Xietan landslide. The soil properties in sliding zone of Xietan landslide are very typical, so it is helpful for identifying sliding plane in practice.