软岩地区预制桩设计施工分析与探讨  

Discussion of Pile Design and Construction in Soft Rock Area

作　　者：卫佳琦 Wei Jia-qi(SGIDI Engineering Consulting(Group)Co.,Ltd,Shanghai 200093,China)

机构地区：[1]上海勘察设计研究院(集团)有限公司,上海200093

出　　处：《建筑科学》2020年第S01期40-44,共5页Building Science

摘　　要：桩基持力层基岩软化会削弱桩基承载力。本文结合软岩地区某工程中两个预制桩应用案例,分析了基岩软化对桩基承载力的影响,并提出相应的控制措施。研究发现,减小基岩软化对桩基承载力影响可以采用隔水措施和增加有效桩长,尤其是桩基入岩段的长度。软岩地区宜采用尖头型一体化桩尖和锤击工艺。尖头型一体化桩尖既可以起到防止地表水从桩孔下渗的作用,也可以增加入岩能力;对比静压工艺,锤击工艺的入岩能力更好。Rock softening reduces pile capacity.This manuscript analyzes the influence of rock softening on the pile capacity through two case studies in soft rock areas.It is found that separation of water and increase of pile length,especial in rock,are effective measures to deduce the effect of rock softening.The use of integrated pile tip and driven pile is recommended.Integrated pile tip can prevent water infiltration from the pile hole and improve the capacity of penetrating into rock.In addition,compared with jacked pile,driven pile takes more advantages in pile embedment depth.

关 键 词：预制桩 软岩 一体化桩尖 锤击工艺 

分 类 号：TU753.3[建筑科学—建筑技术科学]