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Truck/Pavement/Economic Modeling and In-Situ Field Test Data Analysis Applications. Volume 3: Stiffness and Modulus Estimation for Different Soil Types Using FWD Deflection Data.
| 题名： | Truck/Pavement/Economic Modeling and In-Situ Field Test Data Analysis Applications. Volume 3: Stiffness and Modulus Estimation for Different Soil Types Using FWD Deflection Data. |
| 作者： | sargand, s. kim, h. |
| 关键词： | soil tests, moisture content, subgrades, stiffness, soil dynamics, field tests, data analysis, compaction, modulus, aggregates, statistical data, falling weight deflectometers, criteria |
| 摘要： | In current U.S. practice, quality of sub grade in a pavement system is commonly evaluated using the degree of compaction in the field and comparing with the laboratory determined maximum dry density from Standard/Modified Proctor tests (AASHTO T-99/T-180) to confirm the degree of compaction. However density is inherently an indirect measurement of the sub grade quality. This report studies the use of nondestructive testing (NDT) devices, such as the Falling Weight Deflectometer (FWD), to directly and quickly measure sub grade and base stiffness and/or modulus. This study's main objective was assessment of material-specific stiffness and soil modulus of unbound granular soil materials using deflection data from 146 sections in ten states in the nationwide pavement database. In some cases, insufficient or unavailable in-situ soil data were supplemented with laboratory measurements. Calculation of stiffness and soil modulus was based on the linear elastic theory of granular soil material. To achieve high reliability of output results, establishment of the data screening procedures was another major concern in this study. Also, correlations between major engineering properties and stiffness or modulus of unbound granular materials were performed for validation of output results. Statistics for modulus and stiffness of 11 types of sub grade soils are presented, including mean with 95% confidence interval, median, standard deviation, and interquartile range. Similar statistics are given for bases made from aggregate mixed with soil. The sub grade modulus is then correlated with various engineering properties, including moisture content, maximum dry density, plasticity index, and grain size distribution. / NOTE: Final rept. / Supplementary Notes: See also PB2006-105741 and PB2006-110546. Sponsored by Ohio Dept. of Transportation, Columbus. Office of Research and Development. / 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： | u0715；48p |
| 报告类型： | 科技报告 |
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