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| Influence of rainfall preponderance infiltration path on reactivation of ancient landslides |
| ZHANG Yongshuang1，2，WU Ruian3，REN Sanshao1，2 |
| (1. Institute of Hydrogeology and Environmental Geology，Chinese Academy of Geological Sciences，Shijiazhuang，Hebei 050061，China；2. Key Laboratory of Quaternary Chronology and Hydrological Environmental Evolution，China Geological Survey，Shijiazhuang，Hebei 050061，China；3. Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing 100081，China) |
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Abstract Water is one of important factors leading to the reactivation of ancient landslides，and cracks can intensify rainfall infiltration. The coupling effect of water and cracks is the essential reason to promote the reactivation of ancient landslides. Based on studying lots of ancient landslide reactivation cases，the centrifuge physical model tests were carried out. The experiment results show that the permeability of ancient landslides is so weak that it is difficult for regular rainfall to infiltrate into the deep site of landslides，which cannot easily induce the reactivation of large-scale landslides. When cracks appear on the landslide surface and gradually expand downward，the reactivation possibility of ancient landslides in a large scale increases significantly. Furthermore，numerical simulation is performed to analyze the influence of the depth，location and number of cracks on the reactivation of ancient landslides under rainfall conditions. The results indicate that with increasing the crack depth，the influence range of seepage is larger and larger，and the time for rainwater to reach the sliding zone is shorter and shorter. When the crack is located at the rear of the landslide，the landslide is easy to reactivate with a push type along the ancient sliding zone. When the crack is located at the front of the landslide，it is easy to promote the occurrence of progressive reactivation from the front edge to the rear edge，and the required rainfall time is shorter. With increasing the number of cracks，the influence range of the seepage field in the landslide body is enlarged and the saturation time is shortened obviously，which aggravates the reactivation of the ancient landslide. It is suggested that timely treatment of the cracks in the ancient landslides is the key to effectively prevent the reactivation of ancient landslides.
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2021, Vol. 40 
