| Abstract: | Conclusions 1. Experiments with full-scale foundations confirm that even after the start of ground bulging, foundation settlements may even continue to stabilize, the average settlements cease to be allowable, and the s-p curve is even simplified, approaching a linear curve, when the pressure beneath the foundation is increased. At the start of bulging, however, settlement nonuniformities of the foundations increase sharply and even become inadmissible.2. The limiting pressures initiating ground bulge correspond to that section of the s-p curve, where its initial segment converts into an inclined section that is close to a straight line. Up to pressures equal to half the limiting pressures and for shallow rigid foundations on sands of average density and dense sands, the s-p curve is close to linear, and the foundation settlements can be calculated in conformity with the recommendations of the Construction Rules and Regulations.3. For foundations on loose sands, the compaction of sand during shear, which may lead to inadmissible settlement nonuniformities even at minimal pressures due to the foundations, are the most dangerous settlements. The possibility of these nonuniformities should either be eliminated by compaction prior to construction, accounted for during design, In predicting settlement nonuniformity, we should proceed from data on plate tests of loose sands with consideration of the recommendations in 5, 6].VNIIOSP. Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 2, pp. 23–26, March–April, 1988. |
