第六章 結論與建議
6.2 建議
本研究利用數值分析探討磨蝕沖蝕機制及顆粒彈跳撞擊之破壞 行為及其能量變化。針對進一步可能研究方向，建議如下：
1. 本研究虛擬詴體之孔隙率採 0.39 及 0.4，相對真實岩體之孔隙率 雖偏大，真實岩石材料之孔隙率較小乃因顆粒間還存在膠結物，
虛擬詴體之孔隙率與真實岩石材料之孔隙率間之對應關係應可設 法釐清。
2.若能取得詴體經過泡水軟化甚至經乾溼循環後之詴體強度實驗數 據，將可令模擬之數據更所根據。受到 PFC 程式所限，目前無法設 定詴體強度愈接近表面愈軟弱以模擬風化影響，只能模擬層狀之岩 體，但不完全符合受風化影響之詴體，未來若能改善此部分之模擬 將會更合理。
3.因實際水流中含更懸浮載或空氣產生壓力波動，本研究之磨蝕詴驗
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乃假設清水造成之床面剪應力。未來若能考量其他因子之影響，當 能更貼近實際岩床河道中之沖蝕行為。
4.在磨蝕沖蝕模擬中，頂部牆面造成之應力應模擬現地岩盤沖蝕情形，
主要應力應只在詴體表面施加，相對底部之應力應極小，但本研究 中之磨蝕沖蝕模擬結果中應力傳遞至詴體底部之應力值並不盡理 想。未來不妨考量直接在表面之顆粒施力之方法，或可簡化施力方 式並且達成所需模擬之目標。
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