【第3回舗装工学講演会講演論文集 1998年12月】

舗装工学論文集 Vol. 3, 49-56, 1998.12

EFFECT OF ERRORS IN LAYER THICKNESS ON BACKCALCULATED LAYER MODULI

James W. MAINA¹, Hiroshi YOKOTA², Kunihito MATSUI³

¹Student Member of JSCE, Graduate Student, Dept of Civil and Environmental Eng., Miyazaki University (1-1 Gakuen Kibanadai Nishi, Miyazaki 889-2192, Japan)
²Member of JSCE, Professor, Dept. of Civil and Environmental Eng., Miyazaki University (1-1 Gakuen Kibanadai Nishi, Miyazaki 889-2192, Japan)
³Menber of JSCE & ASCE, Professor, Dept. of Civil Eng., Tokyo Denki University (Hatoyama, Hiki, Saitama 350- 0311, Japan)

A study on how errors in layer thickness would affect backcalculated pavement layer moduli is presented. A number of theoretical dynamic and static backcalculation analysis were performed on a hypothetical pavement model, where pavement layer thicknesses were systematically varied. Results obtained showed a pattern in which backcalculated pavement layer moduli were affected by errors in the layer thickness. Variations were also observed in the results obtained using different backcalculation methods. Similar findings were obtained for the case of actual FWD data from Road Test Section 609. The dynamic loading case and static backcalculation method that led to better results were also identified.

Key Words: FWD deflection, dynamic analysis, static analysis, backealculation, pavement layer moduli, pavement layer thickness errors

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本論文の目的は,舗装の層厚誤差が逆解析結果に与える影響を検討することである。あらかじめ舗 装断面を仮定し,測定たわみに誤差が含まれていることも考慮して,層厚の値を一層づつ変化させ逆 解析を行っている。また荷重には,静的荷重だけでなく動的荷重も考慮している.舗装誤差の影響は, 静的及び動的な解析方法又はFWDの種類に応じて種々みられたが,それは変動係数によって一義的 に評価されることが分かった。これは,第1回共通試験の609工区におけるデータを用いた解析でも 同様であった。解析手法とFWDの組合せの中で最も精度のよいものも得られている。