This report is devoted to one of topical questions of a seismic building-to specification of seismicity of a territory depending on concrete soil conditions of the building area. It is noticed that the method of seismo-districts widely applied now possesses suffer from grave shortcomings, in particular, with reference to concrete soil conditions. It in great degrees concerns a choice of the reference soil corresponding to seismicity of territory on a card of seismic zoning. For definition increment mark of seismicity on others soils concerning the reference the indicator of acoustic rigidity (product of density of a soil for speed of distribution of seismic waves) and position of level of subsoil waters is used. At such approach to the question decision all soils (except rock) give an identical increment mark, irrespective of their properties and conditions. As have shown results of numerous experimental researches, question decisions above-mentioned by practically in all cases yield the results far differing from observed phenomenon in the nature. It is based on that the indicator of acoustic rigidity not in all soils depends on their humidity (sand, gravel, rubble, rigid clay and rock). Humidity of a soil can be a matter only for clay soils in plastic conditions. Besides in the given approach to the question decision are not considered physic-mechanical and stability indicators of a concrete soil, in each special case providing its seismic stability. The proposed method offered by the author is deprived above mention lacks.
The article is devoted to experimental research of the major dynamic indicator of soil. The study describes the technique for conducting research on vibrating installation. There are marked changes in the adhesion of moist forest masses depending on density – humidity of the soil, intensity, duration, and parameteкs of dynamic effects. The possible values of soil adhesion in dry, moist, and water-saturated conditions have been analysed. The research results contribute to the appointment of protective measures, the prevention of seismic subsidence deformations of the constructions that cannot be obtained with weak soils during strong earthquakes.
Taking into account the rheological properties (creep) of clay soils when solving problems of soil mechanics is important, because many inaccuracies in forecasts related to soils arise from an under-accounting of these properties, which are characteristic of clay soils. The report deals with the issues of vibration creep of moisten loess soils, related to the precipitation of structures and the permissible load on the soil. The method of experimental research and the results of experiments on the dependence of the coefficient of soil vibration creep on the acceleration of vibrations are presented. The factors influencing the vibration creeping deformations of the forest, including the role of soil adhesion and the duration of shaking, are established. Research results are of great importance in the practice of constructing unique engineering structures in seismic areas.
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