非破壞性撓度試驗法因具維持鋪面完整與量測迅速特性，已廣泛被公
路 養護單位所採用，做為調查鋪面結構強度之工具。為瞭解鋪面結構特
性，試 驗數據的演繹方式大致可分為1. 應力分析與2. 撓度指標法法兩
種；前者是 以力學分析與數學模式為基礎，對鋪面結構進行定量分析，
優點為精確，但 演繹方式相對地複雜許多，後者則以經驗公式及統計理
論對鋪面結構進行定 性研判，其雖有快速簡便之優點，但卻無法對各類
鋪面建立一體適用的準則 。鑑於此，本研究首先結合動態應力分析與統
計理論，分析傳統撓度指標評 估表之優缺點，針對原有指標未盡周詳處
加以改善，建立能有效監控路面成 層結構狀況，且適用於台灣高速公路
鋪面結構特性之穩態及衝擊式撓度指標 評估表。

　　研究發現，由於穩態撓度實驗之施測頻率多設定於25Hz，較一般鋪面
結 構的共振頻率範圍高出許多，致使鋪面慣性力控制系統反應，故下層
材料的 特性較無法被實驗反應出，造成傳統穩態撓度指標於鋪面下部結
構評估成效 不佳；此外，由於國內高速公路基層強度低於其上部之瀝青
材料層，厚度亦 遠小於路基土壤，故穩態、衝擊式撓度指標對該層之反
應相對地並不明顯。 基於此，本研究將傳統撓度指標配合組合式撓度指
標值，建立以動態理論分 析為基礎之撓度指標評估表。經實例分析證實
該撓度指標評估表除能有效詮 釋鋪面加鋪前後之整體及各層結構強度變
化外，其定性評估與動態回算結果 具有相當的一致性。


　　 As the Nondestructive deflection tests become more
popular in investigating

the pavement structural capacity, the data interpretation of the
tests are improved for batter accuracy. In general,
deflection index method and stress analysis method are
considered. The later is made by conducting mechanistic
analysis with differential equations of motion. It can
provide detailed deformations and stresses of the
structure. A quantitatively complex solution can be achieved
by this method. On the other hand, the former is based on
empirical formulations and theory of Statistics; the
deflection indexes are suggested for a special
pavement structure, although it is more conveniently used in
the practice, it can not be generalized for all cases.
Moreover, the solution only provides qualitative results of
the pavement. In order to provide a more theoretical-sound
base of the deflection index method, both steady-state and
impulsive tests are simulated on pavement sections of three
different local routes. Convent ional deflection indexes are
checked and modified. It is found that the conventional
steady-state deflection indexes work poor for the subgrade
layer in which the inertia effects of the dynamic
response of the pavement are caused by the testing frequency.
The structural capacity of the subbase is hard to detected
by the conventional deflection indexes. Modification of the
deflection indexes with theoretical dynamic stress
analysis and rigorous statistics methods can give better
estimation of the pavements . Based on a couple of case
studies, the newly proposed deflection indexes can provide
compatible results to the predictions of dynamics
backcalculations.