![]() Under the river erosion influence of the slope toe, the cracks finally penetrate and cause landslide damage. Then, the cracks gradually expand to the front edge. ![]() The deformation starts from the middle and rear parts of the slope, and cracks are generated. The test analysis shows that the JDY ancient landslide demonstrates composite retrogressive sliding. However, when the water content is 15% and 20%, the landslide body is damaged, and the centrifugal acceleration required for slope instability is 100 g and 50 g, respectively. The tests show that when the water content is 10%, only a few cracks are generated in the middle and rear parts of the slope by the end of the test, but the landslide is still in a stable state overall. To study the reactivation mechanism of the JDY ancient landslide, based on field geological survey, the centrifuge simulation tests of the landslide body under 10%, 15%, and 20% water content conditions are carried out. ![]() Affected by fault activities, rainfall, river erosion, and human engineering activities, the JDY landslide has been repeatedly reactivated and blocked the Bailongjiang River, causing great disasters. The Jiangdingya (JDY) ancient landslide is a large-scale landslide located in the Bailongjiang River fault zone, Zhouqu County, Gansu Province.
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