It is of great practical significance to carry out pile foundation expansion isolation treatment in black cotton soil areas.A pile foundation expansion isolation treatment technology is proposed and studied by analytical method and numerical simulation.It is found that setting a double-layer separated cylindrical structure between bored piles and soil has a significant effect on expansion isolation.The method of reducing the stiffness of pile-black cotton soil interface is adopted in the engineering in black cotton soil areas in East Africa,the displacement of pile head caused by soil expansion and contraction will be significantly reduced;in terms of reducing the influence of expansion and contraction of black cotton soil on pile axial force,the effect of interface reduction is also obvious.The research results have important reference value for the engineering construction in similar areas in the future.
black cotton soilfoundationpile foundation expansion isolation
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