摘要
本文结合宁波机场、温州机场砂井超载预压等工程,论述了预压荷载下砂井地基固结有限元分析方法,通过室内外试验探讨了正常固结土的次固结变形特性,说明超载预压对减小土的次固结变形和推迟次固结变形的发生有肯定的效果。本文还提出了一种分析超载卸除后地基残余变形的方法,并建议用有效应力面积比来进行超载设计和卸载控制。
According to engineering practice of surcharge precompression on Ningbo Airport and Wenzhou Airport etc.,consolidation analysis of ground with sand drains under preloading by FEM is discussed in this paper. The deformation characteristics of normally consolidated soils are studied in laboratory and field preloading tests, which demonstrate that there are positive effects for surcharge precompression to reduce the deformation resulting from secondary consolidation and to delay the occurrence of secondary compression. A method of calculating deformation after unloading of the surcharge is developed. Furthermore, a so called effective stress area ratio is proposed, which may be used to determine the amounts of surcharge and the preloading period.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
1991年第2期1-12,共12页
Chinese Journal of Geotechnical Engineering
