层间软弱夹层发育的切向边坡失稳模式及稳定性研究

通过系统分析边坡工程地质条件及岩体结构,采用定性分析结合有限元模拟研究了边坡变形破坏模式,并采用块体理论及极限平衡法系统分析边坡局部及整体稳定性。结果表明,切向边坡的变形破坏模式可以分为两类:深层变形破坏为受层间软弱夹层空间展布特征控制的块体失稳,浅表层破坏为局部块体失稳及强风化强卸荷带岩体沿最大剪应力带的滑移-拉裂变形。稳定性分析结果认为边坡浅表层岩体稳定性差,但发生深层破坏的可能性较小。

STUDY ON FAILURE MODEL AND STABILITY OF ONE TANGENTIAL SLOPE

This paper studied on the failure model and stability of tangential slope with many bed weak layers at spillway slope at one hydropower station.The deformation and failure model of the tangential slope was studied by qualitative analysis method and finite element modeling based on analyzing engineering geological conditions and rock mass structure,which indicates that the deep failure model of the slope is block broken that controlled by the extension of bed weak layers,and that the failure model of the slope is block broken in partial slope and slip-tension crack along maximum shearing stress band in the zone of heavy weathering and unloading rock mass.The partial and integral slope stability is analyzed systematically using block theory and limit equilibrium theory,which indicates that the stability coefficient of the area of heavy weathering and unloading rock mass in the superficial slope is low and the slope may destroy under some conditions such as storm rainfall and earthquake,while the stability in deep slope is fine.