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RATIONAL FOUNDATIONS ON FROST HEAVING SOILS

In Russia, there was patented a new non traditional way to raise foundations of cottages and multistory buildings on frost heaving soils, that was introduced into practice in conditions of seasonal freezing of soils and also in a region with severe climate and permafrost. The traditional ways of constructing foundations on the frost heaving soils require placing footings below the frost line, which in spite of the high costs of zero cycle stage construction does not guarantee the reliability and durability of foundations. Our new non traditional way of designing and construction of foundations allows the evaluation of normal frost heave forces and their non uniformity with a new precise method, make the recording and collection of designed loads acting on foundation from the side of expansive soil and, therefore, to create shallow foundations capable to stand additional forces originated due to non uniformity of frost heave (presently not listed yet in any of existing normative documents on construction), not to mention that it allows to practically completely eliminate zero cycle stage of construction (the cost of this stage of construction can reach 40 50% of a total cost of construction of a cottage). In this way concrete usually lying in the ground can be used for construction of one more technical floor, which could be used as a garage, heater, sauna, workshop, etc. This new non traditional way to raise foundations was introduced into practice in 1991 in the Leningrad (Saint Petersburg) region in construction of brick cottages. The installation of the bases was done in wintertime on frozen heaving loamy soils. Levelings were conducted on a regular basis for two years to control a condition of the foundations. The results of levelings have shown that the offered method of designing and raising of foundations is rational and reliable. Settling occurred only during the construction period starting from the beginning of thawing out of the basis (May) and continued due to growth of loads during construction of cottages, but then completely stabilized before the construction was completed (July),and did not develop anymore in the consequent years. The non uniformity of settlements, considerably smaller than accepted value of i = 0.005, was observed only during construction period due to non uniform growth of loads and completely disappeared after the construction was completed. There were no deformations observed in the new non traditionally constructed shallow foundations of the cottages for five winter seasons (1992 1997). We can help you evaluate the degree of heaving and frost resistance of soils and pick up the most rational type and construction of the foundation for your cottages. We can help you to build easier, faster, more reliably and cheaper.


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