A Case Study on the Integrated Application of Global Navigation Satellite System (GNSS) and Terrestrial Laser Scanning (TLS) for the Deformation Monitoring of Rural Road Slopes
D-Q. Xiao, Y-Q. Yu, W. Zhan, Z. Hu and X. Yan
The universal low cost monitoring technique of rural road slopes remains the focus of geotechnical engineering practitioners. Limited by the cost of transport operation and maintenance, the long-term in situ monitoring of mountainous pastoral road slopes is still deficient. In this paper the longterm field monitoring of a typical slope in mountainous areas is carried out using the global navigation satellite system (GNSS) and terrestrial laser scanning (TLS) technology. The instability and collapse of the slope are successfully monitored and forewarned. By analysing the temporal and spatial deformation evolution characteristics, the catastrophe mechanism of the slope is revealed. The results show that the results of TLS are in good agreement with GNSS data, and TLS has incomparable advantages for the surface monitoring of dangerous slopes. The geological condition is the internal cause of the landslide, and continuous heavy rainfall is the main trigger factor of the landslide. Loose deposits and sparse vegetation cover on the surface are also important reasons for sliding. This study provides reliable monitoring data for the subsequent reinforcement measures of the slope. Also, it provides a valuable reference for the low-cost monitoring and early warning of risk slopes in mountainous areas.
Keywords: Terrestrial laser scanner (TLS), global navigation satellite system (GNSS), road slope, deformation monitoring, rural, low-cost