Characteristics and monitoring-based analysis on deformation mechanism of Jianshanying landslide, Guizhou Province, southwestern China

Under the influence of mining, a lot of cracks and deformation were developed on the back edge of the Jianshanying landslide. Through monitoring data analysis and numerical simulation of dangerous rock collapse after coal mining, the landslide deformation mechanism is analyzed. Results show that in the landslide after coal seam mining, the stress redistribution formed “increased stress area” and “stress weakened zone.” The deformation of the landslide is intensive, and the strongest deformation occurred in the goaf roof and boundary. Overlying strata moved forwards to goaf area, and thus, tensile stress concentrated in goaf boundary, producing amounts of tensile fractures. Tensile fractures further expanded by the influence of air surface. The formation mechanism of the Jianshanying landslide can be summarized as “tensile crack–creep–shear slip” failure in the mechanical model. The monitoring results provide fundamental data for evaluating the long-term performance of displacement change and for assessing deformation mechanism of the Jianshanying landslide under the effect of mining activity.