INFLUENCE OF INTERSECTION ANGLE BETWEEN TREND OF SLOPE AND STRATA ON STABILITY OF BEDDING SLOPE

Bedding slope is the most unstable and most easily deform and fail for all kinds of rock slopes.The upper limit of intersection angle between trend of slope and strata is closely related to rock hardness of bedding slope.In order to analyze the influence of intersection angle between trend of slope and strata on the stability of bedding slope,stability calculating model of bedding landslide is built.Considering the lateral resistance of bedding landslide,according to rock bridge transfixion theory of shear testt,he T2b2 and T2b3 rocks are selected as the representatives of soft and hard rocks respectively to analyze the sensitive degree of influence of different intersection angles between trend of slope and strata of bedding slope on slope stability.Finally,the upper limit of angle between the trend of slope and strata for bedding landslide is determined.It is indicated that the slope stability of hard rock is more sensitive than that of soft rock when the intersection angle between the trend of slope and strata changes.It is reasonable that upper limit of the angle for a bedding landslide is 30.°The conclusion is verified by landslides between head of reservoir to Badong in the Three Gorgers Reservoir.The analytical results are very important to analyze the stability of bedding slope and to divide slope structures in potential landslide mapping.