丽宁公路九贝老滑坡的形成机制与稳定性分析

Formation Mechanism and Stability Evaluation of Jiubei Old Landslide on Lining Road

丽宁公路丽江古城至宁蒗开元桥段改扩建工程k34+899~k35+860段为九贝老滑坡发育区。为保证拟建道路安全稳定,需对滑坡稳定性进行分析。在查明滑坡的分布范围、岩土体结构、变形特征、主要诱发因素、形成条件、危害特征等的基础上对滑坡活动性进行定性分析,并采用传递系数法对老滑坡两个主滑剖面在4种工况下的稳定性进行定量评价。结果表明:在天然状态、暴雨状态、天然状态+库区蓄排水作用下滑坡体处于稳定状态,在天然状态+地震作用下老滑坡体将失稳产生新的滑动。

The section k34＋899-k35 ＋860 of reconstruction and extension projects of Lijiang to Ninglang Kaiyuan Bridge on Lining Road is the developed area of Jiubei old landslide. In order to ensure the safety and stability of the planned road, iCs necessary to analyze the landslide stability. On the basis of investigation on the landslide distribution, rock mass structure, deformation characteristics, main in- ducing factors, forming condition and harm characteristics, qualitative analysis of landslide activity is tak- en, and the transfer coefficient method is adopted to quantitatively evaluate the landslide stability under four conditions. The results show that the landslide is stable under the native state, storm state, native state ＋ reservoir storage and drainage, the old landslide will have a new sliding instability in a native state ＋ earthquake.