Abstract
The article provides an analytical solution of the soil pile and surrounding soil cylinder interaction problem, with the possibility of extension of the pile shaft in its construction. Presents a closed solution for determination of radial and tangential stresses in the process of expansion of the pile shaft, as well as the minimum vertical force sufficient for the crushing of the pile material and move it in radial direction to the specified value. The problem is most actual for compacted soil bases with use of piles-drains of sand and sand-gravel mixture.
Highlights
During construction on weak water-saturated clay soils, as a rule, use bored piles of finite stiffness, as well as jet-grouting piles or made of soil [1]
The diameter of piles – drains depends on the technology of their production during deep compaction, i.e. on the expansion of the initial borehole and fill it with sand – gravel mixture
On the basis of joint consideration of geometric (4), physical (5) equations and the equilibrium equations (3), the problem of stress-strain state of the soil cylinder can be reduced to the solution of the differential equation in displacements [8]: d 2u 1 du u dr 2 r dr r 2
Summary
During construction on weak water-saturated clay soils, as a rule, use bored piles of finite stiffness, as well as jet-grouting piles or made of soil (sand, gravel) [1]. Under the pressure of the foundation plate in this layer is formed a complex heterogeneous stress-strain state, which is in the process of loading can be transformed as a result of redistribution of load between the pile – drains and the surrounding soil up to the buckling pile – drains. Physical and mechanical properties of pile – drains, compacted surrounding and underlying soils;
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