ABSTRACT

Among commonly used nondestructive testing techniques for evaluating the integrity of pile foundations, reflection methods based on stress wave propagation are widely accepted as cost-effective tools. For uncapped piles, the frequently used Impulse Response (IR) method has long been recognized as one of the most reliable methods. This paper extends prior developments on the IR method’s core mobility analysis by accounting not only for the pile, but also for the coupled pile-soil system through the introduction of suitable soil parameters. New expressions are derived encompassing the pile’s and soil’s stiffness and damping; the expressions are validated via numerical experiments over a wide range of stiffness and damping data. With the aid of the new mobility formulas, it would be possible to allow not only for the non-destructive assessment of the pile, but also for the recovery of the surrounding soil’s dynamic characteristics. Thus, the dynamic properties of the soil extracted from in-situ tests are referable data which can be potentially useful for the simulation of soil-structure-interaction effects in various types of dynamic problems related to soil dynamics and earthquake engineering.

摘要

在评估桩基完整性的常用无损检测技术中，基于应力波传播的反射方法被广泛接受为具有成本效益的工具。对于无盖桩，常用的脉冲响应 (IR) 方法长期以来一直被认为是最可靠的方法之一。本文通过引入合适的土壤参数，不仅考虑了桩，还考虑了耦合桩土系统，从而扩展了 IR 方法的核心流动性分析的先前发展。导出了新的表达式，包括桩和土壤的刚度和阻尼；这些表达式通过对各种刚度和阻尼数据的数值实验进行验证。借助新的流动性公式，不仅可以对桩进行无损评估，还可以恢复周围土壤的动态特性。因此，从原位试验中提取的土壤动态特性是可参考的数据，可用于模拟与土壤动力学和地震工程相关的各种动态问题中的土壤-结构相互作用效应。