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問題 · 2026-05-21
Could the whole California high speed rail be built underground so that it could be built faster and less dispute on land and environment?
全線地下化在技術上非不可能，但成本極高、工期延長、實務不可行。
將加州高鐵全線建於地下在理論上並非技術不可能，但在實務上存在多重障礙，無法實現「更快建設、減少爭議」的目標。隧道每英里造價遠高於地面或高架軌道數倍，全長約八百英里的全線地下化將使預算攀升至難以承受的規模。施工期不會縮短反而延長：隧道開挖受地質調查、地下水處理、通風系統與逃生設施等複雜因素限制，進度通常比地面工程更慢。加州位處地震帶，地下結構需投入更高的抗震設計與監測成本。此外，車站出入口、通風井與廢土運輸等仍需佔用地面空間，無法完全避免土地徵收與社區爭議，施工期間的噪音與交通改道也會持續影響周邊社區。環境評估程序同樣不會因地下化而消失。加州高鐵目前採取務實策略，僅在山區或高度城市化地區有選擇性地使用隧道，而非全線地下化。
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