路面非破壞性撓度試驗主要目的為評估鋪面結構與路基承載力進而推估路面剩餘壽命或當作加鋪設計時所需之資料，並可作為路面養護管理時，策略研擬的依據。本研究即應用JILS-20型落錘式撓度儀觀測路面撓度，並根據該儀器特性及配合台灣地區公路路面狀況與氣候環境型態，研擬出一套屬於本土化之路面結構強度評估模式，以提供公路主管機關進行路面養護管理之用。 在本研究的進行過程中，首先利用一標準試驗斷面，針對路面撓度觀測時之影響因子進行分析探討，並且選擇對撓度值變化最具影響力之三個因子，溫度、鋪面厚度、施測荷重進行回歸分析，進而建立一套撓度數據校估模式。再者，根據養路工程師的經驗提供，以省、縣公路路面FWD撓度試驗資料，結合撓度數據校估模式與回算分析的應用，建立路面結構強度評估模式。本路面結構強度評估模式的特色，乃是完全以實務資料進行分析建立的，這跟僅以數值模擬方式的研究是不同的，而兩者間最大的差異就在於以實務法的分析較能夠對路面各層強度變化狀況有確實的了解。因此，本研究之成果，既以此特點達成將應用FWD評估路面結構強度評估模式本土化之目標。 The main purpose of using the Falling Weight Deflectometer (FWD), a widely used non-destructive testing equipment, is to evaluate the structural integrity and the bearing capacity of existing pavements. The data measured by FWD can be further analyzed to estimate the remaining life of a pavement and to design the overlay thickness. As such, FWD deflections provide the primary means of making rehabilitation decisions for highway agencies. The JILS-20 FWD was employed in this study for the evaluation of pavement conditions. The major goal is to develop a localized pavement evaluation model based on the characteristics of the testing equipment with the environmental conditions in Taiwan. FWD tests were performed on a standard pavement test section built in this study. The deflection correction model was developed based on FWD measurements using regression analysis with three prime affecting variables; the pavement temperature, the pavement thickness, and the test load. This deflection correction model was further verified to develop a pavement strength evaluation model using FWD data collected from in-service pavements together with site conditions observed by pavement engineers and the applications of backcalculation analysis. Unlike other researches using solely numerical methods for model development, this study used in-situ data to derive the pavement strength evaluation model. As a result, a localized pavement strength evaluation model using FWD deflections can be practically achieved.
