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| Study on the failure mechanism of rock slopes with dipped layered structures under various rock dip conditions |
| SUN Shuwei1，LI Yuan1，YANG Xiaorui2，HU Jiabing1，LIU Liu1 |
(1. School of Energy and Mining Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；
2. Northern Engineering and Technology Corporation，MCC，Dalian，Liaoning 116622，China) |
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Abstract Bedding rock slopes are widely present in nature，and studying the deformation and failure mechanism of bedding rock slopes is an important topic in slope engineering. This study compared the failure mechanism of bedding rock slopes with different rock dip angles using bottom friction tests and numerical simulation methods. The results show that：(1) the failure mechanism of slopes changes significantly with different rock dip angles. When the dip angle was 10°，the failure mode of slopes was slip-tension，when the dip angle was 30°，the failure mode was plane sliding shear，when the dip angle was 45°，the failure mode was slip-compression，and when the dip angle was 75°，the failure mode was bending-toppling；(2) Based on monitoring point image tracking technology，the failure process of bedding rock slopes was obtained，and the displacement results of characteristic points indicated that the deformation and failure of bedding slopes had obvious stages；(3) The safety factor of slopes was non-linearly related to the inclination angle of rock layers. When the inclination angle of rock layers was between 0-25°，the safety factor gradually decreased with the increase of inclination angle of rock layers. When the inclination angle of rock layers was between 25°～70°，the safety factor gradually increased with the increase of inclination angle of rock layers. After the inclination angle of rock layers was greater than 65°，the safety factor of slopes did not change much. The results of bottom friction test matched numerical analysis on slope stability closely. The significant difference in stability of bedding rock slopes with different rock dip angles wat 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 bedding rock slopes.
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