Study on the failure mechanism of rock slopes with dipped layered structures under various rock dip conditions
Bedded rock slopes are widely present in the nature.The research of the deformation and failure mechanism of bedded rock slopes is an important topic in slope engineering.Using bottom friction tests and numerical simulation methods,the failure mechanism of bedded rock slopes with different rock dip angles was contrastive analysis.The results show that:(1)the failure mechanism of slopes changes significantly with different rock dip angles.When the dip angle is 10°,the failure mode of slopes is slip-tension,when the dip angle is 30°,the failure mode is plane sliding shear,when the dip angle is 45°,the failure mode is slip-compression,and when the dip angle is 75°,the failure mode is bending-toppling.(2)Based on monitoring point image tracking technology,the failure process of bedded rock slopes is obtained,and the displacement results of characteristic points indicate that the deformation and failure of bedded slopes have obvious stages.(3)The safety factor of slopes is non-linearly related to the inclination angle of rock layers.When the inclination angle of rock layers is 0°-25°,the safety factor gradually decreases with the increase of the inclination angle of rock layers.When the inclination angle of rock layers is 25°-70°,the safety factor gradually increases with the increase of the inclination angle of rock layers.After the inclination angle of rock layers is greater than 65 °,the safety factor of slopes don't change much.The results of bottom friction test matches numerical analysis on slope stability closely.The significant difference in stability of bedded rock slopes with different rock dip angles is attributed to the significant changes in slope failure mechanisms.The findings of this study can provide reference for the safety evaluation and disaster identification of bedded rock slopes.
slope engineeringbedded rock slopesbottom model testfailure mechanismslope stability
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