- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
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| Citation: | ZHANG Yingbin, DONG Yan, CHEN Yanyan, LI Xiaoqin, FU Haiying, CHENG Qiangong, WEI Jiangtao. Effects of Strength Degradation of Sliding Mass on Movement of Vajont Landslide Numerical Simulation Based on Discontinuous Deformation Analysis[J]. Journal of Southwest Jiaotong University, 2021, 56(6): 1205-1213. doi: 10.3969/j.issn.0258-2724.20190913
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The strength degradation is an important reason for the high-speed and long-distance movement of landslides. In order to explore the influence of landslide strength attenuation on landslide movement ability, taking a high-speed Vajont landslide in Italy as an example, combined with field investigation and landslide history data and based on the shear strength attenuation theory of rock and soil mass, the discontinuous deformation analysis (DDA) method is used to study the influence of sliding band strength attenuation, sliding mass strength attenuation, and their joint action on the unique movement accumulation characteristics of the Vajont landslide. The results show that the remarkable high-speed movement and unique accumulation characteristics of the Vajont landslide are the consequences of strength degradation in both the sliding band and the sliding mass. Among them, the strength attenuation of sliding band play a dominant role in the movement velocity of the landslide. When the strength of sliding band is 15.8° and 6.9°, the maximum velocity of the monitored block is 5 m/s and 19 m/s, respectively. Meanwhile, the strength degradation of sliding mass has a significant effect on its high-speed duration and greatly improves the long-distance ability of landslide movement. When the strength of sliding mass is 40.0° and 14.0°, the maximum horizontal displacement of the monitored block is 140m and 260m, respectively. The ‘en masse’ motion character in the sliding mode can explain well the good strata sequence in the slide deposit after the landslide is fully started.
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