Abstract
Herein presented are the results of modeling and analysis of stress-strain state of layered inhomogeneous foundation soil when it is stabilised by injection to different depths. Produced qualitative and quantitative analysis of the components of the field of isolines of stresses, strains, stress concentration and the difference between the strain at the boundary of different elastic horizontal layers. Recommendations are given for the location of stabilised zones in relation to the border of different elastic layers. In particular, it found that stabilization of soil within the weak layer is inappropriate, since it practically provides no increase in the stability of the soil foundation, and when performing stabilisation of soil foundations, it is recommended to place the lower border of the stabilisation zone below the border of a stronger layer, at this the distribution of stresses and strains occurs more evenly, and load-bearing capacity of this layer is used to the maximum.
Highlights
In construction of mining buildings, civil and industrial buildings there is a frequent situation when soil foundations are made of two or more soils with different physical and mechanical properties while weak strata of the massif are located on top of more solid soil [1, 2]
When forming the stabilization zones according to the schemes (Fig. 1), additional areas of stress concentration are formed under the bases of these zones, as well as along their lateral surfaces
In analyzing the character of the distribution of vertical stress σz from the depth the massif along the axis of symmetry of the foundation z it was established that the formation of the field of vertical stress concentration is observed at z = 7.5...12.5m depending on the location of the stabilisation zones and relations E2 / E1
Summary
In construction of mining buildings, civil and industrial buildings there is a frequent situation when soil foundations are made of two or more soils with different physical and mechanical properties while weak strata of the massif are located on top of more solid soil [1, 2]. The base model for the formation of a database and further analysis (Fig. 1) is implemented for the two-step strip reinforced concrete foundation loaded with a vertical concentrated force P = 154.7kN, the height df = 3.0m and the following mechanical parameters: modulus of deformation Ef = 2000MPa; Poisson's ratio vf = 0.15; density ρf = 2500kg/m3.
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