印尼某火电厂Ａ２—Ａ４区人工边坡失稳机制研究

以印尼某火电厂涉外项目Ａ２—Ａ４区的问题人工边坡为研究对象，通过现场地勘、实际变形失稳过程、数值模拟等方法综合研究了该地人工边坡失稳机制。在此基础上，探讨了边滑坡加固措施的作用效果及合理性。所得主要结论:Ａ２—Ａ４区人工边坡变形失稳机制主要为软弱地层（煤层）切穿暴露所造成的组合滑移以及坡体沿土岩分界面所造成局部变形，变形破坏模式接近圆弧滑动，人工边坡中的软弱夹层是导致边坡失稳的主控因素；Ａ２、Ａ４区综合考虑桩锚＋坡面锚杆的方式进行加固，煤层和全风化泥岩及上部土层内的组合变形没有发展贯通趋势，边坡整体安全。Ａ３区在加固作用下存在沿二级坡脚＋煤层＋全风化泥岩＋上部土层内越顶组合滑移风险以及基坑开挖造成基坑侧壁坍滑风险，需要引起重视并加强监测。

Instability Mechanism of Artificial Slope in A2-A4 Area of a Thermal Power Plant in Indonesia

Taking the problem artificial slope in A2—A4 area of a thermal power plant in Indonesia as the research object,the instability mechanism of artificial slope in this area is comprehensively analyzed by means of on-site geological survey,actual deformation and instability process,numerical simulation and so on.The main conclusions are as follows.The deformation instability mechanism of the artificial slope in A2—A4 area is mainly the combined slip caused by the cut exposure of the weak stratum(coal seam)and the local deformation caused by the slope along the boundary surface of soil and rock.The change failure mode is close to the circular slip.The weak interlayer in artificial slope is the main controlling factor of slope instability.In Areas A2 and A4,the combined deformation in coal seam,fully weathered mudstone and upper soil layer has no trend of development and connection,and the slope is safe as a whole.Under the action of reinforcement,A3 area has the combined sliding risk along the second slope foot+coal seam+completely weathered mudstone+overtop in upper soil layer,and the risk of foundation pit side wall collapse and slide caused by foundation pit excavation,which needs to be paid attention to and strengthened monitoring.