Research Of Stability Analysis Methods For Landslide Plane Deformation

Landslide stability analysis of plane deformation is an important means of judging landslide security state.We can calculate plane coordinates variation of each network node by getting multi-cycle plane monitoring information of landslide deformable body,and analysis stability of each network by making use of the variation.This paper mainly analyzed the feature of landslide deformation,with the several current mainstream stability analysis methods,aimed at finding a suitable way to determine the stability of each network node from reference network and monitoring network.This paper mainly discussed the data source acquisition in the process of analyzing the stability of landslide plane deformation,the choice of adjustment reference system and the feature of several stability analysis methods.The main contents are as follows:(1)This paper analyzed the sources of deformation measurement error,and derived the measurement error on the effects of observations corrections according to the mathematical model,and also analyzed the influence of gross error of observation on the results of plane deformation monitoring,in order to avoid the existence of gross errors,this paper introduced two methods of gross error checking.(2)This paper analyzed the individual characteristic of adjustment reference system for plane deformation monitoring,and verified the importance of choosing adjustment reference system according to an example.(3)This paper discussed several common ways of plane deformation stability analysis,and studied the model,characteristics and applicability of each method in details.(4)This paper proposed an improved method on the basis of the normal gap method,The two dimensional characteristics of landslide plane deformation are considered in the improved method,and the displacement is decomposed into the displacement in X direction and the Y direction.At the same time,we make use of that the direction of the landslide deformation is roughly the same as the direction of the main axis of the landslide.An optimized method for stability analysis is proposed.(5)In order to realize the programmed and automation of the monitoring data processing,we developed the software of horizontal displacement monitoring data processing and stability analysis(DGO).Not only can DGO calculate adjustment of field monitoring data but also we can choose the corresponding stability analysis method for each network node.Judging the stability of the network points in the plane monitoring of landslide and grasping the deformation characteristics and deformation law provide the corresponding reference basis for the decision department,and formulate corresponding control measures,it has important meaning to disaster prevention and reduction.In the process of landslide monitoring,Whether the stability of the network can be judged accurately and reliably plays an important role in the landslide monitoring.