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Cone Penetration Testing.
| 题名： | Cone Penetration Testing. |
| 作者： | mayne, p. w. |
| 关键词： | cone penetrometers, depth, surveys, measuring instruments, equipment, embankments, foundations, laboratory tests, subgrades, geotechnical engineering |
| 摘要： | Cone penetration testing (CPT) is a fast and reliable means of conducting highway site investigations for exploring soils and soft ground for support of embankments, retaining walls,pavement subgrades, and bridge foundations. The CPT soundings can be used either as a replacement (in lieu of) or complement to conventional rotary drilling and sampling methods. In CPT, an electronic steel probe is hydraulically pushed to collect continuous readings of point load, friction, and porewater pressures with typical depths up to 30 m (100 ft) or more reached in about 1 to 11/2h. Data are logged directly to a field computer and can be used to evaluate the geostratigraphy, soil types, water table, and engineering parameters of the ground by the geotechnical engineer on-site, thereby offering quick and preliminary conclusions for design. With proper calibration, using full-scale load testing coupled with soil borings and laboratory testing, the CPT results can be used for final design parameters and analysis.In this NCHRP Synthesis, a review is presented on the current practices followed by departments of transportation (DOTs) in the United States and Canada. A detailed questionnaire on the subject was distributed to 64 DOTs, with 56 total respondents (88%). The survey questions were grouped into six broad categories: (1) use of the cone penetrometer by each agency, (2) maintenance and field operations of the CPT, (3) geostratigraphic profiling by CPT, (4) CPT evaluation of soil engineering parameters and properties, (5) CPT utilization for deep foundations and pilings, and (6) other aspects and applications related to CPT. Of the total number of DOTs responding, approximately 27% use CPT on a regular basis,another 36% only use CPT on one-tenth of their projects, and the remaining 37% do not use CPT at all. Overall, it can be concluded that the technology is currently under utilized and that many DOTs could benefit in adopting this modern device into their site investigation practices; the survey results noted that 64% of the DOTs plan to increase their use of CPT in the future. / NOTE: Final rept. for 27 Sep 01-26 Dec 04. / Supplementary Notes: Prepared in cooperation with Texas Transportation Inst., College Station. Sponsored by John A. Volpe National Transportation Systems Center, Cambridge, MA. and Federal Highway Administration, McLean, VA. / 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： | u0809；126p |
| 报告类型： | 科技报告 |
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