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原文传递 Development and Verification of a Down-Hole Penetrometer.

题名：	Development and Verification of a Down-Hole Penetrometer.
作者：	vipulanandan, c. usluogullari, o. f.
关键词：	shear strength, compression, drilled shafts, clay, boreholes, geotechnical engineering, texas
摘要：	Drilled shafts are increasingly used as foundations to support bridges and transportation structures in geomaterials such as soft-rocks and hard clay. Locating the bottom of the borehole during construction with the required strength is critical. Hence, developing a simple device that could be easily adapted/used with the drilling tool was an interest of this study. Determining the shear strength of the geomaterial in the borehole and at the bottom of the borehole can lead to better designs by identifying the various layers based on strength. In this study, Down-Hole Penetrometer (DHP) was designed, built and tested to determine its effectiveness in measuring the strength of soil/soft rock at the bottom of the borehole. DHP was calibrated in the laboratory by using springs with various stiffnesses and then field tested in clay shale, clay and silty clay in a total of six locations in the Houston and Dallas districts. The test results were used in developing the correlation between undrained shear strength of soil/soft rock and DHP deflection. / Supplementary Notes: Sponsored by Texas Dept. of Transportation, Austin. Research and Technology Implementation Office. and Federal Highway Administration, Austin, TX. Texas Div. / 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：	u0818；56p
报告类型：	科技报告