Investigation and dynamic analyses of rockslide-induced debris avalanche in Shuicheng, Guizhou, China
- PDF / 24,571,518 Bytes
- 15 Pages / 595.276 x 790.866 pts Page_size
- 45 Downloads / 211 Views
Yanbo Zhang I Aiguo Xing I Kaiping Jin I Yu Zhuang I Muhammad Bilal I Shimin Xu I Yaoqiang Zhu
Investigation and dynamic analyses of rockslide-induced debris avalanche in Shuicheng, Guizhou, China
Abstract On July 23, 2019, a large catastrophic landslide occurred in Shuicheng, Guizhou, China. It was a rapid and long run-out landslide that resulted in more than 50 casualties. The displaced materials traveled an approximate distance of 1250 m, with a descending height of around 465 m. In this paper, seismic record analyses and numerical simulation were conducted to determine the run-out behavior of the Shuicheng landslide. To determine the main characteristics of the landslide, geological and climatic settings were obtained by conducting a detailed field survey. The DAN3D model was used to simulate the propagation and runout process of the landslide. It was observed that a combined Frictional-Voellmy model provides assuring results in simulating the Shuicheng landslide. The total duration of the landslide is 60 s with an average velocity of 20 m/s. The maximum velocity is estimated to be 40 m/s along the right bank of the valley, while a high initial velocity of 24 m/s was recorded at the initiation of the landslide. Seismic records obtained from the nearby seismic stations were used to calculate the location of the event and interpret the dynamic process of the landslide. The Arias intensity, HilbertHuang transform, and Empirical mode decomposition were used to obtain a detailed time history of the landslide. The results of the numerical simulation and seismic record analyses are expected to portray the process of similar landslides. This will improve the accuracy of landslide hazard mapping in the region. Keywords Shuicheng landslide . Numerical simulation . DAN3D . Seismic records Introduction In southwest China, especially in Guizhou province, karst is the dominant geological feature. In the past few decades, this region has been subjected to catastrophic long-runout landslides triggered by earthquakes, heavy rainfall, and human activities (Chigira et al. 2010; Xu et al. 2010; Yin and Xing 2012; Xing et al. 2015, 2016; Li et al. 2017). On July 23, 2019, at 8:40 p.m., a massive landslide occurred in Shuicheng, Guizhou, China, resulting in more than 50 casualties as well as a massive loss to infrastructure in that area. The pre- and post-event images are shown in Fig. 1. Distinctive efforts have been made to prevent and mitigate such kind of landslide hazard, and there is a significant reduction in the casualties caused by these disasters. To better understand the mechanisms involved in landslides, various methods are being used to analyze or simulate landslides, including seismic records, numerical simulation, and video records. Video records are the most perceptual method, but it is difficult to obtain, especially in remote areas (Zhu et al. 2019). In this paper, seismic record analyses and numerical simulation were conducted. Furthermore, their comparative analyses were done to determine the run-out behavior of
