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Measuring Thickness of Borehole Sediments by Using Ultrasonic Technology

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Sediments on the bottom of borehole is a major factor which is often responsible for reducing the bearing capacity of pile. The sediments thickness measurement is very important for foundation engineering. This paper discussed the technology and feasibility of detecting the sediments thickness in borehole by using ultrasonic technology. By analyzing the four work modes (single-frequency mode, dual-frequency mode, chirp mode, and parametric array mode) and the relationships between the parameters of ultrasonic transducer and detection indexes, a simplified experimental system with single-frequency mode is designed to measure the sediments thickness in borehole by tailor-made ultrasonic transducer. Several experiments have been performed by the designed experimental system in the artificial environments of borehole. The experimental results show that the echo signals of the sediments upper and lower interfaces are extremely clear and the time intervals between these two echo signals are basically proportional with the sediments thickness. So with the suitable work mode and suitable transducer, using ultrasonic technology to measure the sediments thickness is feasible and effective.
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Keywords: BOREHOLE; SEDIMENTS THICKNESS; ULTRASONIC MEASUREMENT

Document Type: Research Article

Publication date: 2012-05-01

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