施工周期下静压管桩优化设计计算  

Optimized design and calculation of static jacking pipe piles in construction period

作　　者：周晓龙[1] 姬耀斌 萧凡[3] 金波[1] 

机构地区：[1]杭州科技职业技术学院,杭州311402 [2]浙江省工程勘察院,杭州310020 [3]湖州职业技术学院,浙江湖州313000

出　　处：《工程勘察》2014年第4期17-20,29,共5页Geotechnical Investigation & Surveying

基　　金：浙江省自然科学基金(Y1091175);浙江省教育厅科研课题(Y201010010)

摘　　要：大量工程实践和试验证明,静压预制管桩施工时的承载力会随时间变化而变化,广泛存在承载力时间效应现象,可以利用现场静压桩机的特点,采用隔时复压试验对管桩承载力变化规律进行预测。正常施工周期下静压工程桩受到建筑物施工影响,桩顶荷载在终压力后逐渐增加,直到工程竣工,受荷状况不同于隔时复压试验桩情况。综合考虑静压桩受荷状况,引入调节系数进行调节,对施工周期下工程桩承载力时间效应进行必要的修正。工程实例证明,正确应用施工周期下静压管桩承载力时间效应,可以对桩基进行优化设计,降低工程成本。A large number of engineering practice and testing show that the time effects of bearing capacity exist extensively in the construction of static jacking pipe piles. The change regularity of bearing capacity can be forecasted through the time interval re-pressing method. Static jacking piles are affected by building construction in normal construction period. The load on the pile top will increase gradually after the final pressure until the project is completed. The regulating coefficient is adopted to adjust the loads, because the load conditions are different to the piles in time interval re-pressing method. The project examples show that the proper use of the time effect of bearing capacity for the static jacking pipe piles in construction period can optimize the pile design and reduce the engineering cost.

关 键 词：施工周期 静压管桩 时间效应 优化设计 

分 类 号：TU473[建筑科学—结构工程]