Abstract
The article presents the analysis of the results of field experimental study of the effect of the contact surface forms of the foundation on the deformability of subgrade. Experimental data show peculiarities of intensely deformed state of subgrade loaded on a curved concave contact surface. Stiffening of the base in this case is due to higher modulus of deformation of soil deformation in the core base, due to the additional lateral compression of soil, relating to a form of the contact surface.
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