防灾减灾工程学报2016，Vol.36Issue(4)：512-519,8.DOI:10.13409/j.cnki.jdpme.2016.04.002
被动双桩侧向土压力群桩效应的三维数值研究
Three-dimensional Numerical Studies on the Group Effect of the Lateral Soil Pressure along the Pile Shafts for Coupled Passive Piles
摘要
Abstract
The group effect of the lateral soil pressure acting on the passive pile shafts was an important problem.Using the explicit finite difference code FLAC3D,the group effect of the lateral soil pressure along the pile shaft for coupled passive stiff piles(center to center "joining" line being in the directon of applied soil movements) with pined-head and pined-tip condition and uniform soil movement was investigated.The Mohr-Columb elastic-plastic constitutive model was employed to model the non-linear stress-strain soil behaviour and the coupled piles were assumed to have linear elastic behaviour and the interface model incorporated in FLAC3D code has been used to simulate the soil/pile contact.The results given by the numerical analysis indicated that the lateral soil pressures on the coupled passive piles were lower than those for single passive piles,the lateral soil pressure on the "near" pile was higher than those for "far" pile.In the shallow soil,The reinforcing effect was not obvious,but the shadowing effect was remarkable.In the deep soil,the reinforcing effect and the shadowing effect were all remarkable.The shape of the p-δ curves was different from the single pile.After a short linear rise,the lateral soil pressure experienced a non-linear growth before achieving the limiting soil pressure.The magnitude of relative displacement to mobilize the limiting soil pressure was more than those for single passive piles.When the pile spacing increased to 6 times the pile diameter,the group effect became very small.In the end,the group factors of ultimate soil pressure for various pile spacings were summarized and compared with the result of the laboratory model test in the literature.关键词
被动双桩/桩侧土压力/加筋效应/遮拦效应/群桩效应系数Key words
coupled passive piles/lateral soil pressure/reinforcing effect/shadowing effect/group factor分类
建筑与水利引用本文复制引用
李琳,程青雷,逯建栋,鹿群,张建新..被动双桩侧向土压力群桩效应的三维数值研究[J].防灾减灾工程学报,2016,36(4):512-519,8.基金项目
国家自然科学基金项目(41172233)、天津市自然科学基金(13JCZDJC35500)、天津市软土特性与工程环境重点实验室开放基金项目(2011SCEEKL005)资助 （41172233）
