METHOD FOR RAISING STABILITY OF PILE FOUNDATION IN CRYOLITIC ZONE

摘要

FIELD: construction engineering. SUBSTANCE: method involves placement of heat-insulating screen on foundation bed surface and calculation of its desired parameters. Novelty is that heat- insulating screen is placed on surface of and inside foundation bed; its dimensions, geometry, thermal properties of material having spatial anisotropy are determined depending on coincidence between estimated temperature field affording stability of structure throughout entire operating period and calculated temperature field. Calculated temperature field is obtained by solving nonstationary two-dimensional nonuniform equation of thermal conductance in rectangular coordinates using finite- difference method for anisotropic medium which has movable phase interface. Anisotropic medium is engineering-geological section of foundation soil, which encloses heat-insulating screen under design and adjacent construction site. EFFECT: improved pile foundation stability due to thinning of seasonal thaw layer - frost penetration ground without displacement of general level of ground heat balance. 1 cl, 7 dwg