Landslide Deformation Monitoring and Analysis of Influence Factors at K178 + 530 of the Bei’an to Heihe Expressway

Abstract

A landslide occurred at the end of July 2010, at the K178 + 530 section of the Bei’an–Heihe expressway in the Northwest Lesser Khingan Mountains of China. The landslide is located on the left of the road embankment. Waste from road construction, subgrade fill, and surface soil slid along the valley, seriously damaging the road. The landslide is located in the permafrost area of the island. Owing to the atmospheric precipitation, the presence of permafrost, regional climate conditions, and special geological conditions, landslides occur annually from late May to early November. The area is in a relatively stable state during winter. These seasonal landslides have seasonal, gradual, low angle characteristics. By November 2012, the studied landslide had moved a distance of up to 104.15 m at the rear edge and 24.8 m at the leading edge. With the soil at the rear of the landslide decreasing and the recorded movement of the landslide over time, the landslide deformation appears to show an apparent attenuation trend. This article reports on a 2-year geological survey monitoring the surface deformation and soil geothermal changes. Research and analysis of the deformation features and effects of the landslide, and large scene survey and monitoring information can provide valuable information for analyzing soil landslides occurring in high latitude permafrost areas. Research results of steady disaster control and the optimization of artificial slope design hold important reference value for high-latitude permafrost area landslides.