Study On Real-time Monitoring And Stability Of High And Steep Slopes Disturbed By Mining

The high-steep rock slope has the characteristics of steep slope,high steepness and strong suddenness.Under the disturbance of underground coal mining,the deformation of the slope is complicated,the monitoring is difficult,and it is difficult to prevent and control.The GNSS real-time monitoring technology is used to monitor the high and steep slopes in the mining area.Research on deformation laws and real-time early warning have become effective methods to prevent disasters.Aiming at the real-time monitoring and stability of high-steep slopes on the ground under mining disturbances,this paper takes the high-steep slopes of Luhu Village,Shanxi,China as the research object,based on the location of the high-steep slopes of Luhu Village and the location of the coal mining face.The relationship established a GNSS real-time monitoring system,trying to study the deformation mechanism of mining slopes,the research found that:(1)Mining,terrain,and rainfall are the main influencing factors that affect the movement and deformation of the slope.The moving speed and displacement of the measuring point can be used as a comprehensive reflection of the three influencing factors.Underground mining provides a continuous external driving force for the movement of the slope.The downslope direction of the slope has obviously aggravated the deformation,and the rainfall has a phased acceleration effect on the speed of the slope in the airside direction.(2)Establish an early warning model based on the slope moving speed and displacement index.The speed change has the characteristics of sinusoidal change.The mm/d speed scale data is suitable for long-term prediction,and the mm/h speed scale is suitable for early warning of sliding,which can be predicted through long Obtain the active period of deformation,combined with the pre-sliding warning for early warning;use statistical analysis methods to establish a three-level speed warning model,the first level early warning is dominated by mining,the second level is dominated by mining and rainfall,and the third level is affected by mining,rainfall and downhill direction Leading;a displacement warning based on the Verhulst model is established,and the initial displacement is determined by calculating the predicted value,which is used as the slope deformation displacement threshold.(3)Cumulative displacement,non-uniform deformation,and steep surface slope caused by underground mining are the direct causes of slope instability.Aiming at the stability of high and steep slopes,this paper analyzes the slope's non-uniform deformation,displacement field and The characteristics of the UAV disaster time series image showed that the surface damage was mainly concentrated in the period of non-uniform deformation.This stage increased the instability of the slope.At the same time,the non-uniform deformation was mainly concentrated in front of the advancing position of the working face.It is small,and the movement of the slope top is greater than the slope toe,the slope top stress stretch area,the slope toe is the stress concentration area.(4)Based on the change characteristics of the sudden change point of the slope displacement,a model of the stability stage of the mining slope is established,which is divided into:stabilization stage-destruction stage(concentrated and severe)-stability increase stage.This research contributes to the dynamic deformation laws and stability changes of high and steep slopes in mining areas,and fully demonstrates the sufficient advantages of the GNSS real-time monitoring system in coal mining subsidence areas.