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原文传递 Cone Penetrometer Equipped with Piezoelectric Sensors for Measurement of Soil Properties in Highway Pavement.

题名：	Cone Penetrometer Equipped with Piezoelectric Sensors for Measurement of Soil Properties in Highway Pavement.
作者：	zeng, x. d.
关键词：	piezoelectric sensors, prototypes, laboratory tests, shear modulus, poisson's ratio, wave propagation, design, modifications, ohio
摘要：	This project developed a mobile and robust cone penetrometer prototype with piezoelectric sensors to measure soil properties in highway pavement. Work in the initial stage focused on fabricating a prototype equipment with attention to its portability and ruggedness and other features necessary for field use. Sensors for the cone penetrometer were purchased and tested, and the original instrument design was modified to make it more rugged and sensitive. A software based on the theory of wave propagation in granular materials was developed for field data analysis. Laboratory tests on the system using two different types of soils, one fine grained and the other coarse-grained, showed good results and repeatability for resilient modulus, shear modulus and Poisson's ratio. The shear modulii of the soils agree well with that calculated by Hardin and Richards's equation. Work in the second stage focused on design improvement and field testing of the prototype equipment. Final design modifications to the prototype were made and the equipment was fabricated. The design modifications were aimed at making the equipment lightweight for easy handling and sensors waterproof to allow the use in wet soils. A vibration system was also introduced to help drive the penetrometer in the ground smoothly. The Ohio DOT has provided a test site in Delaware County for evaluating the equipment in the field. A commercial manufacturer has signed a memorandum of understanding with the University for commercialization of the equipment. / NOTE: Final rept. (Jan 2005-Jul 2006). / Supplementary Notes: Sponsored by Transportation Research Board, Washington, DC. / Availability Note: Product reproduced from digital image. 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：	u0717；30p
报告类型：	科技报告