Study on instability mechanism of multi-stage rotational landslide in open-pit coal mine with soft rock slopes
LI Jindian
Abstract：The landslide of open-pit coal mine with soft rock slope in eastern Inner Mongolia has the characteristics of multi-polarity and rotation.In order to explore the formation mechanism and deformation mechanism of landslide,a multi-stage rotational land-slide in eastern Inner Mongolia was selected as the research object.Based on the analysis of the basic characteristics of the multi-stage rotational landslide in the study area,the variation law of the mechanical properties of soft rock under different water contents is discussed through the indoor rock and soil physical and mechanical properties test.Combined with global navigation satellite sys-tem(GNSS)slope monitoring data and the stress state of the landslide,the motion characteristics of different positions of the sliding body and the migration law of the sliding body itself,the migration state of each stage of the landslide,the stress action mode of each position of the landslide body are analyzed.Through the calculation of slope stability,the stability of the slope sliding along other weak layers and the stable state of the slope sliding along the weak layer at different depths are analyzed,and the later deformation trend of the landslide is speculated.Based on the numerical simulation method,a three-dimensional slope model of 1 500 m×1 000 m×360 m is established.By analyzing the changes of displacement and equivalent plastic strain in the process of slope deformation,the instability mode of multi-stage rotational landslide is revealed.The results show that the soft rock of slope is greatly affected by groundwater,and the formation of landslide is controlled by the weak layer of soft rock,which is the main factor of progressive de-formation of rock and soil mass;the landslide has a tendency to expand to the south and to the deep,the whole landslide deformation process can be divided into four stages:landslide incubation and weak layer activation,landslide creep and accelerated instability,landslide expansion and main sliding surface formation,landslide multi-stage expansion and instability.
Keywords：soft rock slopemultiple rotational landslideGNSSslope deformation characteristicslope failure mode
Publication Date：2025-11-20
Online Publishing Date：2025-11-25(First online date of this platform, not the publication date of the document)
Pages：7( 150-156 )