三峡库区巫山县望霞乡廖家坪高陡斜坡失稳机制研究  

Mechanism on Un-stability of Liaojiaping High-Steep Slope in Gorges Reservoir,Wangxia Village,Wushan County

作　　者：黄波林[1] 刘广宁[1] 彭轩明[1] 

机构地区：[1]宜昌地质矿产研究所,湖北宜昌443003

出　　处：《华南地质与矿产》2008年第4期49-55,共7页Geology and Mineral Resources of South China

基　　金：中国地质调查局灾害预警项目(编号:1212010640601)

摘　　要：廖家坪高陡斜坡详细勘查结果表明廖家坪坡体上分布有7层软弱层,发育有两组高倾角节理,相互垂直,形成众多危岩体岩柱。上部软弱层为蠕滑层,悬崖壁存在的众多危岩体及岩柱以软弱层为基底。根据平推式滑坡的变形失稳机理分析,计算其起动临界水头高度,认为该斜坡上部坡体平推式滑动的可能性较小。根据工程地质类比法认为由于基础风化压缩,也可造成硬岩拉张,形成次生倾倒破坏;采用离散元分析验证了廖家坪高陡斜坡倾倒破坏演化过程,模拟结果与野外调查的变形破坏现象完全一致,表明该高陡斜坡的变形破坏机制为倾倒失稳模式。这一破坏模式的判定为廖家坪高陡斜坡的稳定性分析和防治提供了重要依据。Liaojiaping High- steep slope detailed exploration show that there are seven soft layer in the slope, there develops two teams joints, the two teams joints are high dips and vertical to one another, which forms many dangerous rockmass and rock columniation. The upper soft layer is creepping, which are the basis of dangerous rockmass and rock columniation in the cliff. According to horizontal pushing landslide failure mechanism, after calculating, the limited value of water high to slide for the first block, it is little possible for upper slope to horizontal push. According to the Geology Engineering analogy method, the hard rock can be tensed open or toppled down because of the soft basis is weathered or compressed. Using UDEC, the paper analyses that how Liaojiaping High - steep slope evolve. The simulation is consistent to the field phonomena, these show that Liaojiaping High - steep slope＇s failure mode is toppling mode. The failure mode judgement offer important base for the slope stability analysis and management.

关 键 词：软弱夹层 破坏机制 平推式滑动 倾倒 廖家坪高陡斜坡 

分 类 号：P642.2[天文地球—工程地质学]