The torsional low strain integrity test (TLSIT) is now regarded as the most potent alternative to the longitudinal wave test for the existing pile evaluation. However, the lack of the 3D wave theory for the TLSITs greatly hinders the application of this method. This paper establishes a coupled 3D soil-pile model based on the continuum theory. A corresponding analytical solution of the dynamic pile response is derived and subsequently verified through the comparisons against the 1D wave theory and the Finite Difference Method. The proposed model exhibits the transverse wave interferences and finds: (1) The transverse wave interference that occurred during the TLSITs can be seen gradually alleviated from the pile center to the pile edge. (2) The larger the pile dimensions are, the greater the transverse wave interference would be.

中文翻译：

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扭转低应变完整性试验期间实心桩中的三维波传播

扭转低应变完整性测试（TLSIT）现在被认为是现有桩评估的纵波测试最有效的替代方法。然而，TLSITs 缺乏 3D 波理论极大地阻碍了该方法的应用。本文建立了基于连续统理论的耦合3D土桩模型。通过与一维波理论和有限差分法的比较，推导出了相应的动态桩响应解析解。所提出的模型展示了横波干扰并发现：（1）在TLSIT期间发生的横波干扰可以看到从桩中心到桩边缘逐渐减轻。(2)桩尺寸越大，横波干扰越大。