侧翼与滑床复合锁固切向层状岩质滑坡动力学机理与稳定性判据

侧翼与滑床复合锁固滑坡是在斜坡渐进性变形过程中，切向层状岩体受特殊的边界条件控制，发生非同步和非均匀的变形而形成的。锁固段岩层的变形与破坏模式可以概化为两个相邻端固定而其余则为自由的多层矩形板结构，在横向荷载和纵向荷载共同作用下所发生的“屈曲．弯曲”变形和临界荷载下的断裂破坏问题。基于Rayleigh-Ritz能量变分法，建立了薄板的弹性挠度-荷载方程，应用塑性极限分析方法，确定板的临界荷载，建立了滑坡稳定性的判据。

DYNAMICS AND STABILITY CRITERION OF OBLIQUE LAYERED ROCKY LANDSLIDE UNDER LOCKUP WITH COMBINATION OF FLANK AND BEDDING PLANE

Oblique-layered rocky landslide under lockup with combination of flank and bedding plane is a new type of deformation and failure of slopes. For the oblique slopes of layered rocks,the dips of layered rocks and slope intersect each other, the angle between the strike of layered rocks and the strike of slope is more than thirty degrees, and the dip angle of the layered rocks is greater than ten degrees. Generally the progresive failure is developed of oblique-layered rocks at the pre-failure stage. In plane, one of flanks is free due to the preexisting fault and subsequent erosion by water, and another flank on the middle part of the deformed layered rocks is coonected with undisturbed rocks . In addition, the oblique-layered rocks spin asymmetrically around an axis perpendicular to the potential slip surface near the middle locked segment of the flank. On cross-section, along the perpential slip surface,the deformaed layered rocks are not completely sheared through the surface, and the downslope movement in the layered rocks decreases gradually from outside to inside where sliding is impeded. So according to the behavior of the layered rocks, pre-failure deformation of landslide can be described by bending of multilayered rectangular plates with two adjacent edges fixed and the other free under combined transverse and lateral loads, and the onset of failure of landslide can be viewed as buckling-bending and critical rupture of the plates. By means of Rayleigh-Ritz energy methods, an equation of elastic deflection-load of plate is established,and then the ultimate bearing capacity of plate is determined with the approach of plastic limit analysis.Consequently, a stability criterion of landslide is deduced and a case is analyzed, which is proved to be effective in the quantitative stability evaluation of this kind of landslide.