The “8·21” rainfall-induced Zhonghaicun landslide in Hanyuan County of China: surface features and genetic mechanisms

Ye, Fei; Fu, Wei; Zhou, Huakun; Liu, Yue; Ren-ji, BA; Zheng, Shuang

doi:10.1007/s10346-021-01722-5

Cited by 8 publications

(2 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of the strong influence of rainfall, earthquakes, and human engineering activity, landslides often occur along and near the expressways in the study area. For instance, at 03:50 on 21 August 2020, the Zhonghaicun landslide occurred due to heavy rainfall, and road traffic was interrupted for a long period [23], which seriously threatened the construction and safe operation of the expressways. Therefore, it is necessary to carry out wide area landslide detection along and around the expressways in the region as a matter of urgency.…”

Section: Study Areamentioning

confidence: 99%

Wide Area Detection and Distribution Characteristics of Landslides along Sichuan Expressways

Chen

Zhang

et al. 2022

Remote Sensing

View full text Add to dashboard Cite

Wide area landslide detection is a major international research hotspot in the field of geological hazards, and the integration of multi-temporal optical satellite images and spaceborne interferometric synthetic aperture radar (InSAR) appears to be an effective way to realize this. In this paper, a technical framework is presented for wide area landslide detection: (i) multi-temporal satellite optical images are used to detect landslides with distinguishable geomorphological features; (ii) Generic Atmospheric Correction Online Service (GACOS) assisted InSAR stacking is employed to generate annual surface displacement rate maps in radar line of sight using satellite SAR images from both ascending and descending tracks, which are in turn utilized to automatically detect active landslides from ground motion using hotspot analysis, and (iii) the distribution characteristics of the detected landslides are investigated by examining their relationships with topographic and hydrological factors. Three expressways in Sichuan Province, China—namely the Yakang (Ya’an-Kangding), Yaxi (Ya’an-Xichang), and Lushi (Luding-Shimian) expressways—and their surrounding regions (a total area of approximately 20,000 square kilometers) were chosen as the study area. A total of 413 landslides were detected, among which 320 were detected using multi-temporal satellite optical images, and 109 were detected using GACOS-assisted InSAR stacking. It should be noted that only 16 landslides were detected by both approaches; these landslides all exhibited not only obvious geomorphological features but also ground motion. A statistical analysis of the topographic and hydrological factors shows that of the detected landslides: 81% are distributed at elevations of 1000–2500 m, over 60% lie within the elevation range of 100~400 m, and 90% present with medium and steep slopes (20°~45°), and 80% are located within areas seeing an annual rainfall of 950~1050 mm. Nine landslides were found to pose potential safety hazards to the expressways. The research findings in this paper have directly benefitted the Sichuan expressways; equally important, it is believed that the technical framework presented in this paper will provide guidance for hazard mitigation and the prevention of transportation hazards in the future.

show abstract

Section: Study Areamentioning

confidence: 99%

Wide Area Detection and Distribution Characteristics of Landslides along Sichuan Expressways

Chen

Zhang

et al. 2022

Remote Sensing

View full text Add to dashboard Cite

show abstract

“…In the Midas GTS model, the groundwater level is de ned at the interface of the eluvial layer and weathered phyllite (Ye et al 2021). Rainfall simulation is realized by applying surface ow on the upper surface of the model, and the rainfall value is set according to the results of on-site monitoring.…”

Section: Model Descriptionmentioning

confidence: 99%

Study on Collapse Mechanism and Treatment Measures of Portal Slope of a High-speed Railway Tunnel

Xia

Zhong³

et al. 2022

Preprint

View full text Add to dashboard Cite

The slope of an open cut tunnel is located above the exit of the Leijia tunnel on the Changgan high-speed railway. During the excavation of the open cut tunnel foundation pit, the slope slipped twice, a large landslide of 92500 m³ formed. The landslide body and unstable slope body not only caused the foundation pit of the open cut tunnel to be buried and the anchor piles to be damaged but also directly threatened the operational safety of the later high-speed railway. Therefore, to study the stability change in the slope of the open cut tunnel under heavy rain and excavation conditions, a 3D numerical calculation model of the slope is carried out by Midas GTS software, the deformation mechanism is analyzed, anti-sliding measures are proposed, and the effectiveness of the anti-sliding measures is analyzed according to the field monitoring results. The results show that when rainfall occurs, rainwater collects in the open cut tunnel area, resulting in a transient saturation zone on the slope on the right side of the open cut tunnel, which reduces the shear strength of the slope soil; the excavation at the slope toe reduces the anti-sliding capacity of the slope toe. Under the combined action of excavation and rainfall, when the soil above the top of the anchor pile is excavated, two potential sliding surfaces are bounded by the top of the excavation area, and the shear outlet is located at the top of the anchor pile. After the excavation of the open cut tunnel, the potential sliding surface is mainly concentrated at the lower part of the downhill area, and the shear outlet moves down to the bottom of the open cut tunnel. Based on the deformation characteristics and the failure mechanism of the landslides, comprehensive control measures, including interim emergency mitigation measures and long-term mitigation measures, are proposed. The field monitoring results further verify the accuracy of the anti-sliding mechanism analysis and the effectiveness of anti-sliding measures.

show abstract

The activity, segmentation, and evolution characteristics of large-scale landslides along the Anninghe active fault zone, Southwest China

Zhou

et al. 2022

Bull Eng Geol Environ

View full text Add to dashboard Cite

The “8·21” rainfall-induced Zhonghaicun landslide in Hanyuan County of China: surface features and genetic mechanisms

Cited by 8 publications

References 27 publications

Wide Area Detection and Distribution Characteristics of Landslides along Sichuan Expressways

Wide Area Detection and Distribution Characteristics of Landslides along Sichuan Expressways

Study on Collapse Mechanism and Treatment Measures of Portal Slope of a High-speed Railway Tunnel

The activity, segmentation, and evolution characteristics of large-scale landslides along the Anninghe active fault zone, Southwest China

Contact Info

Product

Resources

About