Analytic method of pile groups considering slipping between piles and soil and dynamic adjustment of integral stiffness

Based on the current studies on large pile groups,an analytical method considering slip of piles and soil and dynamic adjustment of integral whole stiffness of pile groups was put forward.The calculated result was verified by use of centrifuge tests.Furthermore,it was shown that load-displacement of pile groups and load distribution on pile top were affected by properties of soil and stiffness ratio of piles to soil,and by length,diameter,spacing,and number of piles.