南京砂性土地区预制管桩抗拔承载特性试验研究  

Experimental study on uplift bearing capacity of precast tubular pile in Nanjing sandy soil area

作　　者：赵升峰[1,2] 黄广龙[1] 章新[2] 熊彬涛 孙苗[2] 

机构地区：[1]南京工业大学交通运输工程学院,江苏南京210009 [2]南京市测绘勘察研究院有限公司,江苏南京210019

出　　处：《河南理工大学学报（自然科学版）》2017年第3期145-150,共6页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(41472283);南京市测绘勘察研究院有限公司立项课题(2016RD05)

摘　　要：为研究南京地区砂性土中预制管桩抗拔承载特性,基于8根抗拔管桩的现场单桩破坏性静载试验,对比分析采用JGJ94—2008规范公式、倒圆锥台破坏模型、复合剪切破坏面模型和圆柱形破坏模型等4种方法计算得的预制管桩抗拔承载力与实测承载力的关系;同时分别采用双曲线函数、指数函数及幂函数对所有试桩的荷载-位移曲线进行拟合分析。结果表明:采用JGJ94—2008规范公式计算所得的抗拔承载力明显小于实测值,而倒圆锥台破坏模型计算值又明显大于实测值,圆柱形破坏模型计算值接近实测值;指数函数拟合曲线与实测荷载-位移曲线吻合度较高,拟合效果较好。In order to study the bearing capacity of precast tubular uplift pile in sandy soil of Nanjing, based on the destructive field static load tests of eight uplift piles, it is analyzed the relation by compared four theoretical methods of calculating bearing capacity of JGJ94 -08 standard formula, inverted truncated cone failure model, composite shear failure model and cylindrical failure model with the measured data. Meanwhile, fitting curves is carried on to analyze the load - displacement curves of test piles by hyperbolic function, exponential func-tion and power function. Results show that the calculated bearing capacity of JGJ94 - 08 standard formula is much less than the measured value, and the calculated value of inverted truncated cone failure model is much higher than the measured value, cylindrical failure model is the only theoretical methods close to the measured values. In addition, exponential function fitting curve has high goodness of fittness and with the measured load -displacement curve and satisfactory effect.

关 键 词：预制管桩 破坏性试验 抗拔桩 极限承载力 

分 类 号：TU47[建筑科学—结构工程]