Известия Томского политехнического университета: Инжиниринг георесурсов (Jan 2018)
Influence of the method for determining soil properties in numerical calculations of deformations
Abstract
The relevance of the research is caused by the need of quality of engineering-geological survey for construction in constrained urban environment. Quality research is ensuring the reliability of existing residential and industrial foundation, is a resource-saving, minimizes the volume of capital expenditures for reconstruction of buildings and structures caught in the zone of influence of new construction. It is necessary to determine the required soil parameters for later use in numerical simulation, it is a very important component of ensuring the quality, reliability of estimation of stress-strain state. The main aim of the research is to study the pattern of stress distribution, deformation at the base of a new building in dense areas, to compare the amount of precipitation of buildings and structures, obtained by various methods, to identify deficiencies of methodology for determining the parameters used in numerical simulation. Methods of the research: analysis of domestic and foreign experience; determination of soil strength parameters on bibliographical and archival sources; collection, systematization and analysis of available geological information; compiling the model of soil mass; calculation of strains by the layer wise summation and numerical modeling of the stress-strain state of a subgrade with the mechanical properties defined in various ways; mapping the simulation data and traditional calculations to SP 22.13330.2016 with the observations. Research results. The paper considers local lithotechnical system of interaction «foundation-soil» in the conditions of dense development on the territory of Moscow. The authors have compared the data on foundation deformation obtained in simulation with the observations and with calculations by the method of layer-by-layer summation. Mathematical calculations were carried out using both the table values of the parameters of soil mechanical properties and the ones experimentally determined at site. For more reliable results mathematical modeling requires data stabilometric test, especially to pay attention to the development of national standards to determine the Poisson's ratio, coefficient of lateral earth pressure and the angle of dilatancy.
