摘要
在对双向复合地基的各组成部分及工作原理进行分析的基础上,基于薄板变形的有限差分法理论和Winkler弹性地基模型,对水平-竖直向增强体系进行合理假定,并考虑复合地基中碎石桩的双向排水作用,提出了桩土应力比随时间变化关系式以及路基工后沉降计算方法.该方法综合反映了桩土应力比随时间变化的特性以及荷载大小、网及桩间土的刚度、复合地基置换率、散体材料桩体的双向固结作用等因素对桩网复合地基的工后沉降的影响.用文中计算方法对一工程实例进行计算,验证了计算方法的可行性.
The composition and the work mechanism of double-direction composite ground were discussed. Based on the theory of sheet deformation and Winkler elastic foundation model and reasonably assuming the system of the vertical and horizontal reinforcement, a formula for the pile-soil stress ratio and a calculation method of the post-construction settlement were proposed, which took into account the two-direction drainage of the stone column system and the time effect of the pile-soil stress ratio. This method takes into account the following influence factors： the load, the stiffness of net, the stiffness of the soil between piles, the replacement rate of the composite foundation and the change of the two-direction consolidation. Finally, to validate the method pro- posed, a case history was illustrated. The calculation result of the case history shows that the calculated value is very close to the observed value based on the proposed method.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第6期1-6,共6页
Journal of Hunan University:Natural Sciences
基金
国家863计划资助项目(2006AA11Z104)
关键词
有限差分法
薄板挠度
WINKLER地基模型
双向固结
工后沉降
finite difference method
sheet deformation
Winkler foundation model
two-way consolidation
post-construction settlement
作者简介
赵明华（1956-），男，湖南邵阳人，湖南大学教授，博士生导师.通讯联系人。E-mail：mhzhaohd@21cn．com
