CAJ | 학술논문

从复合地基的基本概念、分类、加固机理出发,着重阐述复合地基加固法中的CFG桩的加固机理、适应范围、设计原则及计算方法、施工工艺选择和质量检验。提出在公路工程软土地基处治中可采用CFG桩,并得出CFG桩施工工艺简单、适应范围广,所用材料是在碎石桩的基础上加入少量的水泥和粉煤灰,受力特性与水泥搅拌桩类似。它可用于杂填土、饱和及非饱和粘性土、粉土、砂性土及湿陷性黄土地基中,以提高地基承载力和减少地基变形。只是当原地基承载力标准值fk≤50kPa时其适用性值得考虑。若以挤密或消除液化为目的时,采用CFG桩是不经济的。
종복합지기적기본개념、분류、가고궤리출발,착중천술복합지기가고법중적CFG장적가고궤리、괄응범위、설계원칙급계산방법、시공공예선택화질량검험。제출재공로공정연토지기처치중가채용CFG장,병득출CFG장시공공예간단、괄응범위엄,소용재료시재쇄석장적기출상가입소량적수니화분매회,수력특성여수니교반장유사。타가용우잡전토、포화급비포화점성토、분토、사성토급습함성황토지기중,이제고지기승재력화감소지기변형。지시당원지기승재력표준치fk≤50kPa시기괄용성치득고필。약이제밀혹소제액화위목적시,채용CFG장시불경제적。
This paper started from the basic concept of composite foundation,classification and reinforcement mechanism.Then the reinforcing mechanism of CFG pile in composite foundation reinforcement as well as its adapting scope,design principles,calculation methods,construction process selection and quality inspection was mainly expounded.It was proposed in this paper that CFG pile could be applied to the soft ground treatment in highway engineering due to its simple construction process and wide applicability.As its material is gravel pile with addition of a small amount of cement and fly ash,it has similar mechanical properties as cement mixing pile.It can be applied to miscellaneous fill,saturated and unsaturated clay,silt,sandy soil and collapsible loess foundation to improve the bearing capacity of foundation and to reduce its deformation.However,its applicability is worth considering only when the standard value of original foundation bearing capacity fk≤50kPa.And it is uneconomic in terms of compaction or eliminating liquefaction.