Numerical investigation of the recent Chenhecun landslide (Gansu, China) using the discrete element method
- PDF / 5,007,910 Bytes
- 17 Pages / 439.37 x 666.142 pts Page_size
- 17 Downloads / 212 Views
Numerical investigation of the recent Chenhecun landslide (Gansu, China) using the discrete element method Zhuo Chen1 · Danqing Song2 Received: 19 March 2020 / Accepted: 18 September 2020 © Springer Nature B.V. 2020
Abstract Loess–mudstone landslides are widely distributed in Northwest China. However, the deformation features and kinematic processes of these landslides are still not well understood. The Chenhecun landslide occurred on June 10, 2016, near Chenhe village, Dongxiang County, China. Based on detailed field surveys, Google Earth images, and borehole investigations, a geological profile of the landslide was constructed. Using the two-dimensional discrete element software MatDEM, this work analyses the deformation behaviours and kinetic characteristics of the landslide. In the dynamic analysis, the landslide failure process, velocity, displacement, heat generation, and energy conversion are taken into account. During the whole simulated landslide process, the sliding mass at the rear and bottom edges exhibits lower mobility than at the front and upper edges. The kinetic energy of the landslide dominates in the acceleration stage, and friction is the main source of energy dissipation during the entirety of the landslide movement. A band-like high-heat zone is formed near the sliding belt, and this zone expands forward with sliding. The gravitational potential energy is mainly converted into heat, kinetic energy, and elastic potential energy. In addition, the simulated geometry and accumulation characteristics from the MatDEM are in good agreement with the topographic features of the landslide. This work could provide an important reference for understanding the motion of similar geological hazards in the area. Keywords Chenhecun landslide · Discrete element method · MatDEM · Baxie river basin · China
* Danqing Song [email protected] 1
State Key Laboratory of Hydraulic and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China
2
Department of Hydraulic Engineering, State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
13
Vol.:(0123456789)
Natural Hazards
1 Introduction The Loess Plateau of China, along the middle part of the Yellow River, covers an area of approximately 430,000 k m2 and has a thickness of 100–300 m (Zhuang et al. 2018; Li and Mo 2019). Loess is a typical type of clayey silt with unique structural features such as macro-pores, a strong water sensitivity, a loose texture and well-developed vertical joints, which makes it vulnerable to slope failure (Wen and Yan 2014). Landslides frequently occur in the Chinese Loess Plateau, causing property damage and loss of lives almost every year. To date, approximately one-third of the geohazards (such as earthquakes and landslides) in China have occurred on the Loess Plateau (Xu et al. 2017). Gansu Province is in one of the highest landslide susceptibility zones in the Chinese Loess Plateau. In the Longxi and Longdong regio
Data Loading...
