摘要
微型桩(Micropile)和常规钻孔灌注桩相比,具有单位体积混凝土承载力高、施工场地小、适用各种类型的土、布置形式灵活等特点,可以用做输电线路杆塔基础。本文通过软土地基上微型桩的单桩、群桩抗压和抗拔现场试验,研究其荷载-沉降特性、群桩效应、施工工艺等,以期为微型桩的设计和施工提供依据。试验结果认为:单桩荷载-沉降曲线是缓变型,属摩擦桩,可以以2 0mm沉降量对应的荷载作为桩的极限承载力;可以以2 0mm～3 0mm上拔量对应的上拔荷载作为单桩极限上拔荷载;斜桩可以更好地承担上拔荷载。
Compared with common bored-pile, micropile has the mer it of higher bearing capacity,less occupancy for construction,and greater adaptat ion to any type of soils.It can be used in the foundation of transmission tower. This paper introduced a series of field tests of single piles and pile groups. The curve of load-settlement of single pile indicated that the pile is a frictional pile,that the load corresponding to the settlement of 20mm can be reg arded as the ultimate load of single pile, and a batter pile can bear more u plift load than a vertical pile.
出处
《土木工程学报》
EI
CSCD
北大核心
2005年第3期99-105,共7页
China Civil Engineering Journal
关键词
微型桩
单桩
群桩
现场试验
micropile
single pile
pile group
field test
