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SOME OBSERVATIONS ABOUT BACKCALCULATION AND USE OF A STIFF LAYER CONDITION.
| 题名： | SOME OBSERVATIONS ABOUT BACKCALCULATION AND USE OF A STIFF LAYER CONDITION. |
| 作者： | Mahoney-JP; Winters-BC; Jackson-NC; Pierce-LM |
| 关键词： | PAVEMENT-LAYERS; LAYER-MODULI; BACKCALCULATION-; COMPUTER-PROGRAMS; STIFF-LAYER-CONDITION; SATURATED-SOILS; WATER-TABLES |
| 摘要： | For the last several years, advances in estimating layer elastic moduli by the use of pavement surface deflections and backcalculation computer programs have been rapid. As the available computer programs have continued to evolve, so too has the understanding of the input and output of such software. The stiff layer [its location (depth) and stiffness] is, of course, just one of the many important considerations in performing backcalculation of deflection data. Both the traditional and some of the more recent observations pertaining to the various mechanisms that can result in a stiff layer condition, and the effect on layer moduli in backcalculation, are reviewed. Recent project work in the state of Washington reveals that a saturated soil condition or water table can result in a stiff layer condition. Empirical evidence is offered suggesting that saturated soil conditions (or water table) should be considered when evaluating the results of current backcalculation processes. |
| 总页数： | Transportation Research Record. 1993. (1384) pp8-14 (7 Fig., 7 Tab., 7 Ref.) |
| 报告类型： | 科技报告 |
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