某公路河岸古滑坡成因机制及稳定性分析

通过凉山州木里县俄亚乡四川坪子组地质调绘、钻探、物探、室内试验、数值模拟,查明金沙江某公路通过古滑坡区的环境地质条件、物质结构特征,并分析滑坡成因机制,定量计算滑坡安全系数及评价稳定状态.结果表明:在地震作用下,古滑坡处于基本稳定—欠稳定状态,在其前缘修建特大桥,须满足工程安全储备,难度较大,建议改线.

Formation Mechanism and Stability Analysis of an Ancient Landslide along a Highway

Through geological mapping, drilling, geophysical exploration, laboratory experiment and numerical simulation of Sichuan Pingzi Group, Oya Township, Muli County, Liangshan Prefecture, the environmental geological conditions and material structure characteristics of the landslide area in Jinsha river are ascertained, and the genetic mechanism of the landslide is analyzed, the safety coefficient of the landslide is calculated quantitatively, and the stable state is evaluated. The results show that under the action of earthquake, the ancient landslide is in the basic stable-unstable state, the construction of a super-large bridge in its leading edge must meet the safety savings of the project. Some suggestions for the site selection of Jinsha River Bridge are put forward.