Reservoir Regulation for Control of an Ancient Landslide Reactivated by Water Level Fluctuations in Heishui River, China

• 作者: Jian Guo Mo Xu Qiang Zhang Shaoming He Shishu Zhang Xianxuan Xiao
• 来源期刊: 地球科学学刊（英文版）
• 年，卷（期）: 2020,（6）
• 页码范围: 1058-1067
• 页数: 10页
• 语种: 英文

摘要

Due to the complex geological processes of Qinghai-Tibet Plateau, numerous deposits, espe-cially the large-scale ancient landslide deposits, are characteristic features of the valleys incised in south-western China. Intense water level fluctuations since 2011 in Maoergai Reservoir, China, registered the reactivation of Xierguazi ancient landslide, and presented a significant risk to neighboring facilities. Based on detailed field survey and drilling exploration, the landslide was divided into Zone A and Zone B, and other characterizations of landslide were studied as well. To precisely measure the extent of landslide dis-placement during filling and drawdown stage, surface displacement monitoring system was deployed on the landslide. The monitoring analyses data reveal that reservoir fluctuation is the dominant factor influ-encing landslide displacement, especially during drawdown stage. Moreover, a future sliding is anticipated in Zone A, while a creep had already existed in Zone B. A reservoir regulation was then established using the lead-lag correlation between reservoir fluctuation and landslide displacement and landslide stability analysis. In the end, the follow-up deformation monitoring demonstrates that the reservoir regulation controlled the landslide effectively. Landslide control by reservoir regulation in Maoergai can serve as a case study for other settlements involved in similar construction activities.