岩土力学2012，Vol.33Issue(6)：1774-1780,7.
刚性基础下现浇X形桩复合地基桩-土应力比分析
Analysis of pile-soil stress ratio of cast-in-place X-section concrete pile composite foundation under rigid base
摘要
Abstract
As one of the most important factors, pile-soil stress ratio can reflect the load transfer and deformation mechanism of composite foundation. Up to now, as a new pile, no uniform method has been found to calculate the pile-soil stress ratio for X-section pile. Sedimentation basin and filter chamber are typical buildings with concrete floor plate that is considered to be a rigid base. The bearing capacity of pile composite foundation under the rigid base is different from which under the soft base. The in-situ static load tests are carried out based on the foundation treatment project in Qiaobei sewage treatment plant. Besides, a finite element model is built to simulate the cast-in-place X-section concrete pile composite foundation under the rigid base by software ABAQUS. The pile-soil stress ratios are discussed considering some factors including elastic modulus of pile, compression modulus of surrounding soil, pile lengths, cushion thicknesses and compression modulus. The results reveal that the pile-soil stress ratio increases with the increasing of pile modulus, cushion modulus and pile length, while reduces with the increasing of modulus of surrounding soil and cushion thickness. The reasonable pile-soil stress ratio of X-section pile ranges from 20 to 25, corresponding to the pile modulus from 10 to 20 GPa, the cushion thickness from 20 to 40 cm, and the cushion modulus from 30 to 45 MPa.关键词
现浇X形混凝土桩/刚性基础/复合地基/有限元模拟/桩土应力比Key words
cast-in-place concrete pile X-section/ rigid base/ composite foundation/ finite element simulation/ pile-soil stress ratio分类
建筑与水利引用本文复制引用
吕亚茹,丁选明,刘汉龙,崔允亮..刚性基础下现浇X形桩复合地基桩-土应力比分析[J].岩土力学,2012,33(6):1774-1780,7.基金项目
国家自然科学基金高铁联合基金重点项目(No.U1134207) （No.U1134207）
国家自然科学基金青年项目(No.51008115,No.51008116). （No.51008115,No.51008116）
