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Evaluation of bridge foundations by impulse response methods

机译：冲激响应法评估桥梁地基

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Abstract: This paper summarizes the results of a series of impulse response tests on inaccessible drilled shafts constructed at the National Geotechnical Experimentation Site (NGES) at Northwestern University. The drilled shafts are 610 to 910 mm in diameter and 12 to 27 m long, and are covered by pile caps up to 1.5 m thick. Results of tests on drilled shafts obscured by the pile caps have shown that useful information can be obtained below a 'cutoff frequency' which is defined by the propagation velocity and the geometries of the intervening structure and the deep foundation. An extension of the conventional impulse response method using multiple geophones is described which makes interpretation of responses from the foundation easier by minimizing the effects of surface waves on the processed signals. Superposing the velocity responses from each geophone allows the reflections from the deep foundation to be more easily identified. !4
机译：摘要：本文总结了西北大学国家岩土工程实验站（NGES）上建造的无法触及的钻探井的一系列脉冲响应测试的结果。钻孔的井筒直径为610至910 mm，长为12至27 m，并被厚达1.5 m的桩帽覆盖。在桩帽遮盖的钻探井上进行的测试结果表明，在“截止频率”以下可以获得有用的信息，该“截止频率”由传播速度，中间结构和深层基础的几何形状确定。描述了使用多个地震检波器的常规脉冲响应方法的扩展，该方法通过最小化表面波对已处理信号的影响，使对地基响应的解释更加容易。叠加来自每个地震检波器的速度响应，可以更轻松地识别来自深层基础的反射。 ！4

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