向家坝水电站马延坡边坡现场试验 及稳定性研究

本文通过向家坝水电站马延坡边坡现场试验研究，详细分析了含软弱夹层的边坡外部变形、深部变形和地下水位特性及其边坡稳定性计算等问题。主要研究结果表明：（1）边坡位移变形随时间增加而增大，位移变形随深度增加而减小。位移变化速率随时间增加而减小，基本与位移变化阶段相一致；（2）在考虑桩土、岩土体界面罚函数接触的基础上，建立了渗流～应力耦合的三维数值模型，采用有限元强度折减法分析了马延坡边坡的稳定性。

Study on stability and field test of Mayanpo Slope at Xiangjiaba Hydropower Station

Through the field test made on Mayanpo Slope at Xiangjiaba Hydropower Station，the characteristics of the external deformation，deep deformation，groundwater level and stability of the slope with weak interlayers are herein analyzed in detail.The results show that：（1）the slope displacement deformation increases with time and decreases with the increase of depth，while the displacement change rate decreases with time，and basically is consistent with the displacement change stage;（2） based on the consideration of the penalty function contact of the interface between pile soil and the surface of rock mass，a 3-D numerical model of coupling of seepage with strain is established，and then the stability of Mayanpo Slope is analyzed with the strength reduction FEM as well.