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原文传递 Geotechnical Site Characterization of Transportation Construction Sites and Structures: Assessment of Karst Activity at Highway Construction Sites in Greene and Jefferson Counties Missouri, Using the Electrical Resistivity Method.

题名：	Geotechnical Site Characterization of Transportation Construction Sites and Structures: Assessment of Karst Activity at Highway Construction Sites in Greene and Jefferson Counties Missouri, Using the Electrical Resistivity Method.
作者：	anderson, n. l. apel, d. b. ismail, a. kovin, o.
关键词：	electrical resistivity, sinkholes, subsurface structures, geophysical surveys, missouri, bedrocks, voids, visual inspection, geology
摘要：	Two-dimensional (2-D) electrical resistivity data were acquired across and in proximity to active sinkholes at two Missouri Department of Transportation (MoDOT) highway-construction sites. Construction site No. 1 is located in Greene County, Missouri; site No. 2 is located in Jefferson County, Missouri. Two relatively dense grids (1A and 1B) of electrical resistivity data were acquired at Greene County site No. 1 as part of a geotechnical investigation of a proposed interchange. Several active sinkholes with exposed throat diameters on the order of 1.5 ft had been discovered during a routine visual inspection of the site, and the District Geologist decided that a geophysical investigation was warranted prior to routine boring. The primary objective of the electrical resistivity study was to determine if substantive air-filled karstic cavities were present in the subsurface. Secondary objectives were to estimate depth to bedrock and identify anomalous subsurface conditions that might compromise the integrity of the proposed intersection or complicate construction. The electrical resistivity data proved to be of significant utility. Substantive air-filled voids were not imaged on the resistivity profiles. A depth to bedrock structure contour map was generated for the site, and prominent clay-filled and apparently inactive karstic cavities were identified beneath segments of proposed new roadway. / NOTE: Final rept. / Supplementary Notes: Sponsored by Department of Transportation, Washington, DC. Office of Research and Special Programs. / 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：	u0720；22p
报告类型：	科技报告