基于动静比对试验的圆砾持力层预应力管桩选型分析  

Selection Analysis of Prestressed Pipe Pile in Round Gravel Layer Based on Dynamic and Static Comparison Test

作　　者：张建生 ZHANG Jiansheng(Guangdong Shunrong Test Technology Co.,Ltd.Foshan 528300,China)

机构地区：[1]广东顺融检测科技股份有限公司,广东佛山528300

出　　处：《广东土木与建筑》2024年第6期65-68,共4页Guangdong Architecture Civil Engineering

摘　　要：根据某工地4根不同桩径预应力管桩在沉桩后不同间歇时间的高应变和静载试验结果,分析高应变法与静载试验的机理差异,指出由于圆砾层的多成分颗粒结构,桩端阻力的发挥存在明显的“尺寸效应”,应谨慎对待大直径管桩高应变法的检测结果,为提高基桩承载力、降低单位承载力成本,宜优先选用大直径管桩。Based on the high strain and static load test results of four pre-stressed high-strength concrete piles with different pile diameters at different intervals after pile sinking,the mechanism difference between high-strain dynamic testing and static loading test is analyzed.It is pointed out that due to the multi-component particle structure of round gravel layer,there is obvious"size effect"in the exertion of pile tip resistance.The test results of high-strain dynamic testing of large diameter pipe pile should be treated with caution.In order to improve the bearing capacity of foundation pile and reduce the cost of unit bearing capacity,large diameter pipe pile should be preferred.

关 键 词：圆砾 尺寸效应 动静比对 管桩选型 

分 类 号：TU473.1[建筑科学—结构工程]