极密实粉细砂层大直径钢管桩桩基参数分析  

Analysis of parameters of large-diameter steel-pipe piled foundations in very dense fine sand

作　　者：仝成才 施忠良[1] TONG Cheng-cai;SHI Zhong-liang(Dalian Branch Company of Tianjin Port Engineering Design & Consulting Co.,Ltd.of CCCC,Dalian 116000,China)

机构地区：[1]中交天津港湾工程设计院有限公司大连分公司,辽宁大连116000

出　　处：《水运工程》2019年第1期199-202,共4页Port & Waterway Engineering

摘　　要：现行桩基规范缺少极密实粉细砂层桩端阻力和桩侧阻力的规定。结合某海港工程钢管桩基静载及高应变检测,探讨大直径钢管桩在极密实粉细砂层中的桩侧阻力和桩端阻力。高应变检测结果显示,极密实粉细砂层单位面积桩侧阻力范围为93～120. 01 k Pa,平均值为106. 6 kPa,1 500 mm钢管桩桩端阻力范围6. 742～6. 845 MN,平均值6. 780 MN。针对国内外规范对桩基承载力的估算计算结果进行分析,建议极密实粉细砂层桩侧阻力值取90～120 kPa,桩端阻力值取8～12 MPa。The current pile foundation specification lacks the specification of the pile foundation parameters of very dense fine sand layers.This paper discusses the pile side of large-diameter steel-pipe piles in very dense fine sand layers in combination with the static load and high-strain testing of a steel pipe pile foundation in a harbor project.According to the results of high-strain testing,we know that the pile shaft-resistance range per unit area of the fine sand layer of this project is 93~120.01 kPa,and the average value is 106.6 kPa,and the tip-resistance range of 1 500 mm steel-pipe piles is 6.742~6.845 MN,and the average is 6.780 MN.After analyzing the calculation results of the bearing capacity of the pile foundation,it is recommended that the pile shaft-resistance value of the extremely dense fine sand layer takes 90~120 kPa,and the tip-resistance value of the pile takes 8~12 MPa.

关 键 词：极密实细砂 大直径钢管桩 侧阻力 端阻力 

分 类 号：U655.544.1[交通运输工程—港口、海岸及近海工程]