路堤填筑荷载作用下深厚软基桥台桩变形及处理措施分析∗

摘要

Studies indicated that construction of sub⁃grade on deep soft foundation may produce significant influence on the piles. To explore the laws of deformation, this study selected the mechanical analysis software ABAQUS to explore the behavior of piles due to heaped load. The results show that construction of sub⁃grade on deep soft foundation will result in big vertical and horizontal pile displacements. With the increasing of embankment height, growth of pile horizontal displacement accelerated, vertical displacement slowed down. Some general measures are provided against the problem, and a longer bridge is provided to solve the problem.%针对某深厚软土地区桥台侧移现象，运用ABAQUS数值模拟软件，并采用扩展的Drucker⁃Prager模型模拟软土对台后分层填土的施工力学行为进行数值模拟。结果表明，在深厚软基上小厚度的填土即会对邻近桩基产生较大的影响，填土高度3m时承台侧移量就已接近规范允许值，且桩基变形量与填土高度呈非线性关系，随着填土高度增加，水平位移增速加快，竖向位移增速放缓。针对此实际工程问题，对不同的软基处理措施进行探讨，并根据此软基段实际工况采用了桥梁小范围接长的处理措施，取得了满意效果。