Change of properties of the bases on long-term loading

Currently there is an issue of increasing load on the foundation in the reconstruction. It is necessary to take into account the changes in the physical and mechanical properties that occurred in the bases during the long loading. The changes in the properties of the soil under buildings were analyzed. Analysis and research of changes in experimentally determined physicomechanical characteristics of compacted soil under the effect of additional load and in the natural state according to the results of engineering geological experiment in the city of Dnipro. Determination of influence of soil characteristics on foundation settling. The results of field studies prove the conclusion that improvement of the strength and deformation characteristics of soils under influence of action of long-term heavy loads should be considered when designing reconstructed buildings. It is necessary to take into account the intensity and irregularity of buildings settling during exploitation. The purpose of the research is to analyze and study the changes of experimentally determined physical and mechanical characteristics of compacted soil under the action of additional load and in the natural state by results of engineering-geological tests in the city of Dnipro. The determination of influence of soil characteristics on foundation setting. Collection and analysis of field data on changes in soil characteristics in the bases of buildings and structures with different periods of operation. Obtaining dependence of the change in the strength characteristics and deformation characteristics of the soil bases. Determination of setting on the basis of buildings, which are reconstructed according to numerical modelling. Results. To draw conclusions and suggestions on forecasting changes in the characteristics of the soil basis for their use in determining the permissible pressures and setting of foundations at additional loads during reconstruction. Performed engineering geological surveys allowed to determine the physical, deformation and characteristics of soil strength in natural conditions and compacted by a long-acting load. Modified deformation module, internal friction angle, specific gravity, density and humidity, depending on the load on the base were determined.