摘要
以武汉深厚淤泥质地区“前斜后直”倾斜桩基坑支护为例,通过有限元分析,对比“前斜后直”与垂直双排桩支护结构位移、弯矩变化,探讨“前斜后直”倾斜桩基坑支护位移及内力变化特性,结果表明“前斜后直”双排桩位移最大值明显小于垂直双排桩的最大位移,且随基坑开挖深度加大,“前斜后直”双排桩位移控制作用更明显。倾斜支护结构有较好的降低桩身及连梁弯矩的作用,“前斜后直”支护结构中后直桩弯矩总体小于前斜桩弯矩。随基坑开挖深度增加,斜桩支护中桩身及连梁弯矩降低作用更加显著。现场监测表明,“前斜后直”倾斜桩在武汉深厚淤泥质地区的应用效果良好。
Taking the foundation pit project supported by inclined pile with inclined head and straight body in deep and thick silt stratum of Wuhan as an example,this paper carried out finite element analysis,compared the displacement and bending moment changes of pile with inclined head and straight body and vertical double-row pile,and discussed the displacement and internal force changing characteristics of pile with inclined head and straight body in foundation pit support.It was found that the maximum displacement of the double-row pile with inclined head and straight body is obviously smaller than that of the vertical double-row pile.With the increase of the excavation depth,the displacement control effect of double-row pile with inclined head and straight body is more and more obvious.The inclined support structure could reduce the bending moment of pile body and beam.The bending moment of pile with inclined head and straight body is smaller than that of inclined pile.With the increase of the excavation depth of the foundation pit,the bending moment reduction of the pile and the connecting beam is more and more obvious.Based on field monitoring,the pile with inclined head and straight body has favorable application effect in the deep silt stratum of Wuhan.
作者
田野
宋志
张涛
张松波
陈剑雄
TIAN Ye;SONG Zhi;ZHANG Tao;ZHANG Song-bo;CHEN Jian-xiong(General Construction Company of CCTEB Group Co.Ltd.,430070,Wuhan,China;Hubei Building Construction Technology Co.Ltd.of CCTEB Group Co.Ltd.,430070,Wuhan,China)
出处
《建筑技术》
2021年第11期1288-1291,共4页
Architecture Technology
基金
中建股份科技研发课题(CSCEC-2020-Z-34)。
关键词
武汉淤泥地层
斜桩支护
前斜后直
基坑设计
silt stratum of Wuhan
inclined pile support
inclined head and straight body
foundation pit design
