DETERMINATION OF THE CALCULATED (PERMISSIBLE) PRESSURE ON THE LOESS FOUNDATION OF BUILDINGS AND STRUCTURES IN SEISMIC CONDITIONS
Keywords:
design pressure; allowable pressure; seismic load; loess soils; seismic deformation; strength characteristics; soil connectivity; duration and intensity; hydrodynamic pressure gradient; stress state; destruction zones; load bearing capacity.Abstract
This scientific article provides an improved method for determining the allowable (calculated) pressure on the loess foundation of buildings and structures during earthquakes. This improved method for determining the design pressure on the foundation is based on the condition that the average pressure from a structure erected in seismic areas should not exceed its design value, which is determined taking into account changes in the strength characteristics of soils during earthquakes. Obviously, in this case, when calculating the foundations for deformations, the additional seismic settlement of structures will be taken into account. In accordance with the proposed method, the design pressure on the base in seismic conditions is determined by the numerical value of the change in the stress state, soil connectivity and hydrodynamic gradient that occurs in the soil during its compaction. Therefore, the design pressure on the foundation in seismic conditions should be established based on the duration of the seismic load, which, as is known, depends on the soil cohesion and hydrodynamic gradient.
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