METHOD FOR FROST GROUND HEAVING DETERMINATION IN DEPENDENCE OF PRESSURE TRANSMITTED FROM FOUNDATION TO THE GROUND

摘要

FIELD: building, particularly geological engineering survey for foundation building on seasonally frozen heaving ground bases.;SUBSTANCE: method involves taking at least three ground samples; placing the samples in device, which determines degree of frost ground heaving caused by pressure applied to the ground; installing the device in cooling chamber; freezing the ground samples at predetermined rate; creating pressure p₁ in the first sample, wherein p₁ pressure is equal to average pressure caused by ground gravity at design frost depth; measuring maximal heaving pressure p_f(max) in the second sample with taking into consideration compressibility of ground sample and dynamometer; creating pressure p₂ in the third ground sample, wherein pressure p₂ exceeds that caused by ground gravity at design frost depth determined in particular territory, but is not less than 50 kPa; determining pressure p_f(max), ε'_fp1 and ε'_fp2 from above measurements; defining constant ground parameter m₁; determining m₂ parameter from p₁, p_f(max) and ε'_fp2; calculating average actual value m and actual value ε'_fpi depending on p_i from a given relation.;EFFECT: increased efficiency of frost ground heaving degree determination under any pressure.;1 ex, 2 dwg