考虑桩身三维效应下的大直径薄壁管桩–桩端土塞耦合振动模型及其解析解

doi:10.13722/j.cnki.jrme.2018.1217

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摘要对大直径薄壁管桩而言，其在低应变测试条件下的动力响应特性需要同时考虑桩端土塞的影响以及桩身三维效应。据此，提出考虑桩身三维效应影响的大直径薄壁管桩–桩端土塞耦合振动模型，并得到其在复数域内的纵向振动解析解答及其时域内半解析解，并将该解答与基于Rayleigh-Love杆模型的既有理论解进行比对，2种解的一致性进一步证明了考虑横向惯性效应一维杆模型在解决含土塞管桩动力问题上的合理性，同时为这类问题提供了改进的解析模型及求解方法。在此基础上，利用该解的优势，对大直径薄壁管桩的外径尺寸、壁厚和土塞高度等参数组合对低应变测试结果的影响进行研究，使其结果能够为现场工程测试提供理论支持与指导意见。

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	吴君涛1
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关键词 ：桩基础, 管桩, 土塞, 三维效应, 拉普拉斯变换, 纵向振动

Abstract：For large diameter thin-wall pipe piles，the soil plug at the pile toe and the pile three-dimensional effect should be taken into account during low-strain testing. A coupled dynamic model of large diameter thin-wall pipe and pile-soil plug considering the pile three-dimensional effect was presented，and an analytical solution in Laplace domain and a semi-analytical solution in time domain were subsequently deduced subjected to the longitudinal vibration. Comparisons between the solution and the existing solution based on Rayleigh-Love rod model were carried out. It is indicated that the two solutions are identical，which verifies the reliability of the one-dimensional rod model considering the lateral inertia effect in solving the dynamic problems of a pipe pile with soil plug. The influence of the combinations of the outer radius and the wall thickness of the pipe pile and the height of the soil plug on the low-strain testing results adopting the presented solution. The study can provide theoretical support and practical guidance for the engineering test on site.

Key words： pile foundations pipe piles soil plug three-dimensional effect Laplace transform longitudinal vibration

引用本文:

吴君涛1，2，王奎华1，2，刘鑫1，2，孙梵1，2. 考虑桩身三维效应下的大直径薄壁管桩–桩端土塞耦合振动模型及其解析解[J]. 岩石力学与工程学报, 2019, 38(5): 1064-1072.
WU Juntao1，2，WANG Kuihua1，2，LIU Xin1，2，SUN Fan1，2. A coupled dynamic model of large diameter thin-wall pipe pile and soil plug considering pile three-dimensional effect and its analytical solution. , 2019, 38(5): 1064-1072.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1217 或 http://www.rockmech.org/CN/Y2019/V38/I5/1064

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