為了瞭解以可攜式落重撓度儀進行落重試驗能否適用於鋪面非破壞性檢測，本研究透過現地試驗與採用PLAXIS 2D進行之數值模擬進行探討。首先，進行既有文獻鋪面案例之數值模擬，並於已知土層性質之場址進行現地測試，藉此進行研究方法之可行性驗證。接著，再針對一假設機場跑道鋪面案例，以數值模擬方式檢視可攜式落重撓度儀對於鋪面結構分層施工檢驗之效果，並探討代表可檢測深度之應力影響範圍。模擬成果顯示，各分層力學性質在弱化幅度達25%或更高時，由可攜式落重撓度儀所測得之撓度能有效展現之；另一方面，可歸納出此案例之各分層材料應力影響範圍約介於1–3倍承重鈑直徑之間，以粒料基層或底層來說，可保守取50公分為可檢測深度參考值。最後，為了測試以可攜式落重撓度儀於既有鋪面面層施測能否反映基底層的材料性質差異，於實際道路鋪面進行現地試驗，並與直接於基底層施測之動態圓錐貫入儀所得結果進行比較。結果顯示，在可攜式落重撓度儀可檢測深度範圍內，鋪面結構基底層材料的力學性質差異確實能被顯現出來，但更深處的差異則不易被展現，故本方法應用於既有鋪面檢測有其限制。根據相關探討結果，本研究建議於進行鋪面施工成效檢驗時，可利用實際落重試驗所得撓度值與數值模擬正算分析所得撓度基準值相比對，此法相較於以反算分析推估分層材料彈性模數的方式能大幅減少計算時間，且於施工現場較易完成。

This study aimed to investigate the applicability of a portable falling-weight deflectometer (PFWD) to non-destructive testing on pavements through field tests and numerical simulation using PLAXIS 2D. Firstly, simulation of a pavement case in an existing literature was conducted, and field tests were performed at a site with known soil properties. Then, a hypothetical case of the airport runway pavement was simulated to examine the performance of PFWD in the inspection of construction quality of pavements and the influence range of stress. The results indicate that PFWD can effectively detect the degradation of mechanical properties of each layer with a decrement of 25% or more. The influence range of each tested layer in this case is approximately 1 to 3 times the diameter of the load plate. Finally, field tests using PFWD were conducted on actual road pavements, and the results were compared with those obtained from the dynamic cone penetrometer. The results show that the differences in mechanical properties of the base and subbase layers within the detection depth of PFWD can be revealed. Based on the discussions, it’s recommended that the actual deflection obtained from in-situ falling weight tests may be compared with the baseline deflection derived in advance by the forward analysis using numerical simulation in the inspection of construction quality of pavements. This is more efficient than the back calculation and more practical on site.

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