地表爆炸會對地下結構造成相當大的破壞，本論文研究進行一系列試驗和數值研究以探討加勁土在爆炸荷載下的性能與加勁機制。在現場爆炸試驗中，本研究爆炸試驗模型包含僅回填砂土(未加勁土)及用三層地工不織布加勁砂土的試驗坑，以113克TNT炸藥作為爆炸荷載置於試驗坑表面，並量測爆炸後空氣場與土壤中的爆炸壓力、地面變形和實際加勁材料的拉伸應變，用以比較未加勁土和加勁土的試驗結果，以評估使用加勁土作為抵禦爆炸荷載的衰減層之效能。在進行二次爆炸試驗結果顯示，加勁土中之尖峰爆炸壓力值分別僅為未加勁土中的10%和28%。本研究確定了兩種加勁機制：張力膜效應和橫向位移約束效應，此外，本研究亦進行一系列數值分析來評估加勁參數(即加勁材鋪設層數、極限張力強度和勁度)對爆炸壓力的影響，分析結果表示，加勁材鋪設層數和勁度的增加有效地降低了爆炸壓力。基於參數分析結果，實施以加勁土為爆壓衰減層的等值有效厚度研究，為土壤加勁抵抗爆壓力的應用與設計，提供了量化的結果與設計上的建議，以作為一種有效防爆措施選項，以保護地下結構免受地表爆炸的影響。

An explosion on the ground surface can cause considerable damage to underground structures. In this study, a series of experimental and numerical investigations were conducted to examine the performance and reinforcing mechanism of reinforced soil subjected to blast loads. An excavated pit backfilled with sand only (unreinforced soil) and sand reinforced with three layers of geotextiles (reinforced soil) were used as test models in a field explosion test. In the field explosion test, blast pressures in air and soil, ground deformation, and mobilized reinforcement tensile strain were measured. The test results obtained for the reinforced and unreinforced soil were compared to evaluate the effectiveness of using soil reinforcement as a protective barrier against blast loads. The test results indicated that peak blast pressure in the reinforced soil was only 10%-28% of those in the unreinforced soil. Two reinforcing mechanisms were identified in this study: the tensioned membrane effect and lateral restraint effect. Moreover, a series of numerical analyses were performed to evaluate the effects of reinforcement parameters on the blast pressure. This study provides useful insights for the application and design of soil reinforcement as an alternative antiexplosion measure to protect underground structures against surface explosions.

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