Numerical Analysis on Displacement and Stress Field of LCSG Pile under Vertical Loading

摘要

Concrete pile is widely used as one effective foundation type to strengthen soft soil in geotechnical engineering. Several special cross-section concrete piles are introduced and their defect of poor drainage ability is put forward. Concept of one concrete-gravel composite pile, namely long-concrete short-gravel pile (LCSG pile), is presented in terms of its material composition, bearing mechanism and drainage behavior. What?s more, FEM analysis on the working behavior of the LCSG pile under vertical loading is conducted by using Midas software. Distributions of displacement and stress field of soil around the LCSG pile are mainly discussed. The numerical results show that (a) LCSG pile can make good use of engineering materials to gain good working ability, (b) Increasing the length of outer gravel body can effectively achieve lowering the values of displacement and redistribute the Major Principal Stress (MPS) adjacent to LCSG pile and (c) End grouting is very conducive to reduce the magnitude and gradient of the displacement field and the MPS field. The above research results are available to related engineering design.