金坪子滑坡Ⅱ区变形特征与防护设计研究

Study on deformation characteristics of zone Ⅱ of Jinpinzi slide and its protection design

金坪子滑坡Ⅱ区虽远离枢纽建筑物,但若发生大规模失稳,则会影响乌东德水电站发电系统运行安全,须对其作适当防护。结合变形、地下水位、雨量等监测资料,系统分析了该滑坡Ⅱ区的变形特征,认为地下水(降雨)是变形的主控因素,据此提出了以地下排水为主的防护方案。渗流分析及三维极限平衡稳定分析表明,设计布置的地下排水系统效果明显,能够达到防护目的。

Zone Ⅱ of Jinpinzi slide body is far away from the dam structure, however, the generation system of the hydropower station would be affected if large scaled landslide occurs. The deformation characteristics of zone Ⅱ is analyzed systematicaly with consideration of the monitoring data such as deformation, underground water level, rainfall, etc.. The results showed that the un- derground water （rainfall） is the major controlling factor, so the protection scheme taking subsurface drainage as the mainstay is put forward. The seepage analysis and 3D ultimate equilibrium stability analysis reveals that the designed subsurface drainage sys tem is effective and the protection can be realized.