METHOD TO IMPROVE SEISMIC RELIABILITY OF FOUNDATIONS Russian patent published in 2010 - IPC E02D33/00 E02D27/34 

FIELD: construction.

SUBSTANCE: in pit of appropriate depth, fragment of foundation and elements of seismic insulation made of loose materials are arranged, comprising seismic-insulation cushion under foundation and filling of pit pockets. Limit values of foundation vibration speed amplitudes, specified in process of design and permissible by conditions of its strength preservation, are determined. Explosion parametres are designed to obtain average amplitudes of foundation vibration speeds at the level equal to the limit values, for this purpose the expression V_L=Vxyz=11.776X is used, with R²=0.815, where V_L is vector speed of vibrations of average amplitudes of components (x,y,z) (Vxyz) of speeds transmitted by foundation soil through a layer of loose material of foundation, - reduced mass of charge, kg, R² - coefficient of pairwise correlation, r - distance from explosion epicentre to the area of vibrations registration, m, h - depth of charge centre in well, m, Q_Σst - mass of charge in stage of explosion, kg, K_npc - coefficient that takes into account geological and relief conditions, varies from 1.0 to 3.0. On completion of explosive works, level of seismic action suppression is assessed, and if value of this characteristic is less than 2.7 points, thickness of cushion is increased, and/or composition of its material is chosen. Trials are repeated until amplitudes of foundation vibration speeds comply with conditions of its strength preservation.

EFFECT: improved reliability of building, structure seismic protection with reduction of capital and operational costs.

3 dwg