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原文传递 Use of Nondestructive Techniques to Estimate the Allowable Vibratory Compaction Level during Construction.

题名：	Use of Nondestructive Techniques to Estimate the Allowable Vibratory Compaction Level during Construction.
作者：	jackson, n. m. hammons, m. i. walker, r. von quintus, h.
关键词：	structural analysis, ground motion, vibration, flexible pavements
摘要：	Earthborne vibrations from vibratory compaction equipment can be described as single-frequency continuous vibration. Human perception of ground vibrations is subjective and depends upon a number of factors. Damage to structures caused by earthborne vibrations can be categorized as either architectural or structural damage. Architectural damage is superficial damage such as hairline cracks in plaster walls or ceilings. While catastrophic damage to buildings from construction operations are extremely rate, some structural damage such as separation of masonry blocks and cracking in foundations, and other sensitive structures may occur in cases where earthborne vibrations exceed threshold levels. Various Federal, State, and foreign agencies have proposed vibration limit criteria, some intended to mitigate damage to structures, while others are based upon limiting human annoyance. Two of these existing criteria were selected to form the basis of the recommendations documented herein. These criteria are represented as three zones on a plot of peak particle velocity versus vibratory roller frequency. A square root scaling law of ground motion is used to predict the ground motions from vibratory compaction equipment from FWD data. A potentially vibration-sensitive portion of a project can be identified using displacement-time histories from the FWD obtained during routine pre-preconstruction testing. Detailed knowledge of the layering of the pavement structure or the geology of the surrounding site is not required. It is demonstrated that this predictor can be used to restrict vibratory compaction near sensitive structures and fragile buried infrastructure. / NOTE: Final rept. / Supplementary Notes: Sponsored by Florida State Dept. of Transportation, Tallahassee. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0718；80p
报告类型：	科技报告