青石梁近坝滑坡基本特征与稳定性分析

通过工程地质测绘、钻探、平硐及岩土测试等勘察工作,查明青石梁滑坡体积约81万m~3,为中型岩质顺层滑坡,现状整体处于基本稳定性状态。水库运行后或建坝前后叠加暴雨久雨滑体饱水等多种工况下,滑坡整体基本上处于欠稳定—不稳定状态,为此滑坡需要采取工程治理措施。经比较,建议结合大坝二期围堰建设对滑体中部、后缘予以削方减载(用作围堰填筑土料),使滑坡稳定达到安全标准。

Basic characteristics of landslide near dam and analysis of its stability in Qingshiliang

By engineering geological mapping，drilling，aditing，laboratory testing of soil and rocks and other surveying work，the accounted volume of Qingshiliang landslide site is about 810 000 m 3 ，regarded as a medium- sized rocky bedding landslide． The whole landslide has been in stable condition recently． However，after the oper- ation of the reservoir or around construction of the dam， the landslide site would be in a substantially less stable- un- stable status from a variety of conditions including intense and long- time rainfall yielding saturated slip mass． Therefore， the landslide engineering management is demanded． By comparison and combined with the second phase cofferdam construction，it is proposed to cut and lighten the central and trailing edge of the sliding body (used as cofferdam filling material)，so as to make the landslide stability meeting safety standards．