Prediction of Slow-Moving Landslide Mobility Due to Rainfall Using a Two-Wedges Model

In the present study, the landslides cyclically reactivated by water-table oscillations due to rainfall are dealt with. The principal kind of motion that usually characterizes such landslides is a slide with rather small velocity. As another feature, soil deformations are substantially accumulated inside a narrow shear zone situated below the landslide body so that the latter approximately slides rigidly. Within this framework, a new approach is developed in this paper to predict the mobility of this type of landslides due to rainfall. To this end, a two-wedges model is used to schematize the moving soil mass. Some analytical solutions are derived to link rain recordings with water-table fluctuations and in turn to landslide displacements. A well-documented landslide frequently activated by rainfall is studied to check the forecasting capacity of the proposed method.

Secular deformations of the sand ground of Golgotha Mount on the Anzer Island of the Solovetsky Islands in the White Sea

Very slow secular horizontal movement of ground is commonly not taken into consideration during construction of buildings near slopes and bents with no risks of landslide. However, our observations indicate that a range of objects is marked with such movement. Current study is aimed at determining the rate of the sand ground dislocations near the ultimately steep slope. In order to determine the rate, we conducted periodical measurements of the width of the tensile fractures in the loadbearing walls of the building constructed in 1830. Building of the object and its restoration in the current century have led to the imperfect structure of the building, lacking steel ties in the brick walls, which should have been installed at different levels, specifically under the floor and at the level of the vault abutment. The absence of ties has resulted in rupturing of the examined building due to tensioning of the moving foundation. The errors of the constructors have transformed this building into an object that can be used to determine the rate of ground movement.It is not a unique case, as this small velocity is often neglected, which, however, results into the wall fracturing in the course of long-term use.

s-f(d) EXCHANGE MECHANISM OF MAGNON GENERATION BY SLOW SPINPOLARONS

It is shown that in a single-axis antiferromagnetic semiconductor placed in a strong magnetic field, dispersionless magnons start emitting at any arbitrarily small velocity of an electron occurring in a spinpolaron state. If magnons are dispersed they are generated when the spinpolaron velocity exceeds the minimum phase velocity of magnons. The maximum power of magnon generation caused by the drift of spinpolarons is estimated.