METHOD OF SEISMIC INSULATION OF STRUCTURAL FOUNDATIONS Russian patent published in 2010 - IPC E02D27/34 

FIELD: construction.

SUBSTANCE: method for seismic insulation of structure foundations includes development of pit, bottom surface of which is provided with a slope equal to 0.005-0.01, formation of drainage system on pit bottom connected to water-drainage network, filling of cushion at part of pit depth, arrangement of foundation blocks on cushion and filling of pit pockets. Lower level of predicted seismic hazard of foundation area is detected, afterwards, if lower level of predicted seismic hazard corresponds to level of vibrations of 4 points, filling of pockets and cushion is made of coarse-grained sand with cushion thickness of 0.5-2.0 m. If lower level of predicted seismic hazard corresponds to vibration level of 4.5 points, filling of pockets and cushion is made of gravel-pebble soil with cushion thickness of 0.5 m. If lower level of predicted seismic hazard corresponds to vibration level of 5.0 points, filling of pockets and cushion is made of crushed stone with size of up to 20 mm with cushion thickness of 0.1-0.15 m. If lower level of predicted seismic hazard corresponds to vibration level of 5.4 points, filling of pockets and cushion is made of crushed stone with size of up to 20 mm with thickness of cushion of 0.2-0.3 m. Upper level of vibration damping property for applied type of cushion is set as not lower than upper level of predicted seismic hazard, compliance with which for erected foundation is set on the basis of seismograms records by difference of values of two vibration levels (lower and upper ones) in system "base - cushion - foundation" from dissipation of seismic wave energy when passing through loose material cushion.

EFFECT: provision of reliable seismic protection of buildings, structures, reduced material intensity and labour intensiveness in assessment of seismic insulation of foundations.

6 tbl, 11 dwg