Slope stability depends on many factors like weight and properties of materials. Ground water saturation and its pressure produce stresses, which have major impact on the loss of slope stability. Under such circumstances, prediction of any slope movements must involve analysis of disturbing forces from gravity, water pressure and strength of rock mass. The widely used numerical modelling and seismic surveys have been employed for this purpose. However, one has to remember that modelling is not a trivial process, as the mass sliding may result from various failure mechanisms. Seismic interpretation should also be verified by survey excavations: drill holes or trenches. The numerical modelling allows determining the factor of safety and pointing out the probable failure surface. The seismic surveys are used to confirm localisation of failure surface with its complexity. Theoretically, according to the Mohr theory, orientation of failure surface depends on direction of the principal stresses. However, directions of these stresses and their distribution depend on stress history of a particular geological process, which led to slope formation (Ducan and Dunlop 1964; Lo and Lee 1973). Water pressure reduces effective stress and shear strength, as well. Increase of saturation in the zone of discontinuity may trigger mass movement. Under such circumstances, significance of numerical models depends on the actual situation and quality of input information such as forces due to gravity, water pressure, development of the failure process and the level of the forming sliding surface. Often, numerical modelling should anticipate a learning process, in which determination of the stress field should be compared with the actual values. Developing a method for empirical assessment of the rock sliding is needed for this purpose. It seems that seismic measurements in the landslide region may provide valuable information to be used for correction of modelling rock mass movement. Parameters describing any factor possible, including the compressive P-wave, S- wave and surface waves, are valuable in this context. The slope movement in clay and silts is described in the following text. The subject matter of the survey and stability analysis is the embankment of the national road.


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