关键词: 负摩擦排桩, 堆载, 三维有限元, 土拱效应

Abstract: Three-dimensional nonlinear elastic finite element method had been developed to study the negative friction behavior of the row piles subjected to surcharge nearby. The influence of the space between the row piles and the distance between surcharge and row piles on the negative behavior of the row piles was analyzed. The varying law of the axial force of this kind of piles was posted. Study showed that the axial force of piles increased as surcharge increased. While surcharge increased to a certain value, the soil between the piles brought soil-arch effect and then the axial force of piles decreased a little. While surcharge increased continuously, the soil-arch effect suffered destroy, the axial force of piles increased again. While surcharge increased to a certain value, tensile stress produced partly in the top of piles, it increased with the growth of distance between surcharge and piles, middle piles were more tensile stress than side piles. The most axial force of piles lay in 0.65－0.75 time pile length; side piles were more axial force than middle piles. With the increase of piles’ space the axial force of the piles increased; and soil-arch effect dented. The axial force of piles reached maximum, as a certain distance between surcharge and piles.