(1 嘉兴学院建筑工程学院，嘉兴 314001； 2 江西理工大学建筑与测绘工程学院， 赣州 341000；3 浙江天海管桩有限公司，杭州 310000)

［摘要］现场单桩静载荷试验结果表明，新型带肋预应力管桩具有较高的承载力,特别是在沿海的粉砂土地区具有很大的优越性。基于静载试验结果,采用MIDAS/GTS有限元软件，分析了各级荷载工况下新型带肋预应力管桩的应力场和位移场变化规律。模拟结果表明，该类管桩对周边土产生一个与环状凸肋大小相当的圆筒剪切面，在环状凸肋处轴应力变化明显，环状凸肋能有效起到端阻力的作用，对邻近的下部土体产生一个附加应力作用。

［关键词］新型带肋预应力管桩；承载力；MIDAS/GTS；环状凸肋；附加应力

Numerical analysis on a new-type prestressed pipe-pile with rib under vertical load

Xiong Houren^1,2, Jiang Yuanhai¹, Niu Zhirong¹, Yang Jianyong², Zhou Zhaodi³(1 College of Civil Engineering & Architecture， Jiaxing University， Jiaxing 314001， China; 2 College of Architectural and Mapping Engineering， Jiangxi University of Science and Technology， Ganzhou 341000, China;3 Zhejiang Tianhai Pipe Pile Co., Ltd., Hangzhou 310000， China)

Abstract:The static loading test results show that the new-type prestressed pipe-pile with rib has high bearing capacity, and this type of pipe-pile is selected with significant advantage especially in silt soil. Based on the static load test results, the stress and displacement fields of the new-type prestressed pipe-pile with rib were analyzed by MIDAS/GTS at different load case levels. The simulation results show that this type of pipe-pile to peripheral soil has a cylinder shear in the form of surface damage, which is the same size as the annular flange rib, the axial stress changes obviously in the annular flange rib. The annular flange rib can effectively play the role of the end resistance, and has an additional stress to the neighbor lower part soil.

Keywords:new-type prestressed pipe-pile with rib; bearing capacity; MIDAS/GTS; annular flange rib; additional stress

*建设部科学技术项目(2008-k1-18)，江西省研究生创新资金资助项目(YC08A079)。

作者简介: 熊厚仁，硕士，助教，Email：104072005@163.com。

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