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原文传递 Alternative Shallow Cross Pipe Installation Method.

题名：	Alternative Shallow Cross Pipe Installation Method.
作者：	st, m. a. humphrey, d. n.
关键词：	performance evaluation, soils, field testing, instrumentation, numerical modeling, installation methods, effectiveness, surveys, maine
摘要：	The objective of this study was to evaluate the performance of shallow cross pipes insulated with extruded polystyrene insulation as a method to distribute differential heave over larger distances. Research consisted of field testing, instrumentation, and numerical modeling of insulated and uninsulated cross pipes at five selected sites across Maine. The effectiveness of the installation methods with extruded polystyrene insulation placed above and below the cross pipe were evaluated. Cross pipe installations were evaluated based on: influence of insulation, effect on pattern of frost penetration, surface frost heave, influence of soil type, and severity of the freezing season. Heave surveys indicated that pipes that develop heave have greater total heave away from the cross pipe than over the pipe resulting in differential heave. Results showed for sites that experienced significant total heave, the placement of insulation over the cross pipe increased both the magnitude and abruptness of the differential heave. This showed that the length of the transition insulation on each side of the cross pipe was inadequate. The maximum differential heave was observed to occur at the end of the freezing season and start of the spring thaw. / Supplementary Notes: Sponsored by Maine Dept. of Transportation, Augusta. / 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：	u0723；290p
报告类型：	科技报告