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原文传递 FORMALIZED PROCEDURE FOR QUALITY ASSESSMENT OF CAST-IN-PLACE SHAFTS USING SONIC PULSE ECHO METHODS.

题名：	FORMALIZED PROCEDURE FOR QUALITY ASSESSMENT OF CAST-IN-PLACE SHAFTS USING SONIC PULSE ECHO METHODS.
作者：	Rausche-F; Likins-G; Hussein-M
关键词：	CAST-IN-PLACE-PILES; INSPECTIONS-; QUALITY-ASSURANCE; STRUCTURAL-INTEGRITY; SONIC-PULSE-ECHO-METHOD; TESTING-EQUIPMENT; NONDESTRUCTIVE-TESTING
摘要：	Cast-in-place concrete piles are produced by drilling holes in the ground and filling them with concrete. The constructed shape and structural integrity of this pile type is dependent on concrete quality, subsurface conditions, and workmanship. Many engineers are willing to consider this type of piling but require adequate inspection and shaft integrity verification. Dynamic low-strain testing and analysis by the Sonic Pulse Echo Method with equipment such as the Pile Integrity Tester provide a quick and inexpensive means to assess the integrity of all types of concrete piles (where modulus is much higher than surrounding soil) by measuring top motion (and force) under the impact of a small hand-held hammer and then applying one-dimensional wave propagation theories. Data interpretation can be either a simple visual inspection of the dynamic pile records, a rigorous numerical analysis, or a technique that generates an "impedance profile" as a function of length. Testing and data evaluation require experience and engineering judgment. The principles, application, and limitations of the low-strain integrity testing method are presented, and a step-by-step record evaluation and interpretation procedure is proposed. Finally, the value of the record for the quality-assurance process of pile foundations is assessed.
总页数：	Transportation Research Record. 1994. (1447) pp30-38 (7 Fig., 9 Ref.)
报告类型：	科技报告