摘要
利用有限差分软件——FLAC(3D)建立了三维柱坐标下瞬态振动的计算模型,了解低应变反射波法检测大直径桩的效果。通过计算,得出桩顶振动速度的数值解,不仅得到各个角度的速度,还给出了实验验证。此外,探讨了完整桩在瞬态竖向激振力作用下的动力响应,给出了桩顶不同位置的速度时程,并探讨了三维干扰来源,以及桩周土层对检测结果的影响。最后,基于对管桩进行低应变完整性测试数据,验证了该数值算法的可靠性,并对大直径管桩检测提出了对策。
A real3-D pipe pile-soil model of transient vibration under cylindrical coordinate is established,using the finite difference software FLAC3D,in order to get a deep understanding of low strain integrity testing for pipe piles.The numerical solution for the transient dynamic responses at pile top are obtained.Not only velocities of different angles at pile top are obtained,but also the testing curves are presented,which directly reflects the3-D characteristics of wave propagating in the pipe pile.In practice,especially under the conditions that the analytical solution of3-D elastodynamic equations cannot be gotten,the numerical solution has some guiding significance.3-D interference source,and the soil layer surrounding the pipe-pile are discussed.Finally,based on the low strain integrity test data of the pipe pile,the reliability of the numerical algorithm is verified,and the countermeasures for the detection of large-diameter pipe pile are put forward.
作者
李隽毅
LI Juanyi(Shanghai Shen Yuan Geotechnital Engineering Co.,Ltd,Shanghai 200021)
出处
《福建建筑》
2018年第3期33-36,共4页
Fujian Architecture & Construction
