摘要
黄河上某水电站坝后存在一大型顺层岩质滑坡。钻探、平硐、槽探和现场勘查勘察资料表明该滑坡具有平面分区和剖面分层的显著特征。运用地质环境系统全过程动态演化的观点,采用力学理论、物理模型、数值模拟等方法,分析了滑坡的形成机理和演化机制:该滑坡是在河流冲刷和地震活动等内外综合作用下因层状岩质斜坡岩体层间错动和溃屈基而形成,其演化具有明显时间和空间差异性的多次滑动。在此基础上采用多种极限平衡计算方法综合评价滑坡各区、各级在天然状态下的稳定状态,并结合滑坡所处的地质环境及其演化特征预测滑坡在雾雨、地震以及二者耦合作用下的演化趋势。
The landslide located at the downstream of a hydropower station on the Yellow river is a largescale consequent rock landslide. The data of drilling, cavern, trenching and field investigation shows that the landslide has remarkable characteristics, that are multi zones in plain and multi layers in profile. Based on the viewpoint of dynamical evolution of geological environment system, using the methods of mechanical theory analysis, physical model test and numerical simulation, its formation mechanism and evolution process are analyzed. The landslide formed due to shear between layers of bed rock mass in the slope and bed-burst under the actions of erosion of the river water, earthquakes and so on. The characteristics and evidences show that it slided repeatedly until now and each part has different sliding feature at different phase. Based on the knowledge mentioned as above, the stabilities under current situation of each zone and each layer in the landslide are comprehensively analyzed using many limit equilibrium methods. Combining geological environments where landslide located and their variation features, the develop trend of this landslide is also predicted under the coupled action of atomized rain and earthquake in future.
出处
《西北地震学报》
CSCD
北大核心
2008年第3期249-254,共6页
Northwestern Seismological Journal
关键词
顺层岩质滑坡
溃屈
地震
雾雨
形成机理
演化过程
Consequent rock landslide
Bed-burst
Earthquake
Atomized rain
Formation mechanism
Evolution process
