甘肃省白龙江流域典型高位堆积层滑坡成因机制研究及其危险性预测

doi:10.13722/j.cnki.jrme.2022.0428

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Abstract Through the field survey，multi-phase remote sensing data analysis，surface displacement monitoring，indoor test and numerical simulation analysis，the run-off slope in Wudu District，Bailongjiang River Basin，Gansu Province was taken as an example to conduct a deep discussion about the development characteristics，activity characteristics，formation and evolution process of the landslide，and the safety of unstable blocks in the run-off slope landslide source area was scientifically evaluated and predicted. The results showed that：(1) run-off landslide was a large accumulation landslide in a high place，which was formed by the coupling effect of multiple factors，with a volume of 188.35 × 104 m3. It can be divided into three sections：the upper potential slip source area，the middle narrow flow area，and the lower siltation accumulation area，whose evolution was overall characterized by multiple stages，multiple layers，and progressive retrogression. Each slide body is characterized by the creep-tensile pattern and push deformation. (2) Under the conditions of different and uncoordinated landforms，the formation process of run-off landslide was dominated by active neotectonic movement and based on the disaster strata prone to slip，while the continuous deterioration of rainfall，the seismic cracking effect of historical strong earthquakes and the creep effect of faults were the main factors of landslide instability. (3) According to the stability calculation，it can be known that the landslide was basically in a stable state or an unstable state，and there were still different degrees of deformation and damage in several parts. After using River-Flow2D software to simulate the start and movement process of the upper potential slip source area under extreme rainfall conditions，it was shown that the maximum sliding distance was 810 m，the maximum velocity could reach 33.5 m/s，and the maximum accumulation thickness was 26.7 m，with the total accumulation volume of about 121 × 104 m3，forming a local river blockage disaster chain. This research can provide a scientific basis for the prevention and mitigation of such high-level landslides in the basin.

Key words： slope engineering Xieliupo landslide high-level accumulation landslides formation mechanism risk prediction The Bailongjiang River Basin

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0428 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I4/1003

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