From Environmental Liabilities to Negative Carbon Assets: Life Cycle Assessment and Circular Valorization of Tbm Spoils in Mountain Tunnels — Global Lessons and Application to Andean Infrastructure in Peru
環境負債からマイナス炭素資産へ：山岳トンネルにおけるTBMズリのライフサイクルアセスメントと循環型有価化 — 世界的教訓とペルーのアンデスインフラへの応用 (AI 翻訳)
GALVEZ PRP
🤖 gxceed AI 要約
日本語
TBM掘削ずりを従来の埋立処分ではなく、LCAに基づきリサイクル骨材や炭素吸収材（バイオ炭、ジオポリマーセメント）として有価化することで、カーボンネガティブ化が可能。世界の事例を比較し、ペルーのアンデストンネルへの適用モデルと実装ロードマップを提示。
English
This study proposes a Life Cycle Assessment framework to transform TBM tunnel spoils from waste into carbon-negative assets through circular valorization. Results show 25-40% carbon reduction versus landfilling, and a net-negative balance of -32.6 kg CO2 eq/tonne using biochar and geopolymer cements. A roadmap for Andean tunnels in Peru is provided.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本は山岳トンネルが多く、建設発生土の処理は重要な課題。本論文のLCA手法と循環型有価化戦略は、日本のSSBJやScope3算定にも応用可能で、ゼロエミッション建設への示唆に富む。
In the global GX context
This paper offers a replicable methodology for carbon-negative infrastructure using TBM spoil valorization, relevant to global tunneling projects under ISSB/CSRD reporting. The integration of carbon-capture materials and digital optimization aligns with Paris Agreement goals for embodied carbon reduction.
👥 読者別の含意
🔬研究者:The LCA framework and digital TunCO₂ tool provide a basis for further research on carbon-negative construction materials and lifecycle optimization.
🏢実務担当者:Construction firms can adopt the phased implementation roadmap to turn spoil liabilities into revenue-generating recycled aggregates and carbon credits.
🏛政策担当者:Regulators can incentivize circular economy in infrastructure by mandating LCA-based spoil management and supporting carbon-negative material certification.
📄 Abstract（原文）
<title>Abstract</title> <p>Mountain tunnel construction using Tunnel Boring Machines (TBM) generates massive volumes of excavated material (spoils), traditionally managed as environmental liabilities in landfills. This study proposes a methodological framework based on Life Cycle Assessment (LCA, ISO 14040/14044) to transform TBM waste into carbon-negative assets through circular valorization strategies. A comparative analysis is conducted on spoil management in emblematic projects from the Swiss Alps (Gotthard Base Tunnel, 28 Mt; >90% reuse), Brenner Base Tunnel (21.5 Mm³), Lyon-Turin (TELT), Crossrail (London, 95% reuse), Grand Paris Express (45 Mt), and experiences from the United States, France, Spain, Japan, China, Israel, and Australia. LCA results using Ecoinvent v3.9 and SimaPro 9.5 (ReCiPe 2016 Midpoint H) demonstrate that valorizing 80% of excavated material as recycled aggregates, structural fills, and technosols reduces carbon footprint by 25–40% relative to landfill baseline. Integration of carbon-capture materials — biochar (−1.2 kg CO₂e/kg) and geopolymer cements — enables a net carbon-negative balance of −32.6 kg CO₂ eq. per tonne. The TunCO₂ digital framework is introduced for lifecycle carbon optimization in TBM tunnelling. An applicability model for Peru's Andean tunnels (Olmos Trans-Andean Tunnel, 20 km; Punta Olímpica Tunnel, 4,738 m.a.s.l.) is proposed, leveraging favorable volcanic and andesitic geology for high-quality recycled aggregate production. A phased implementation roadmap (0–2, 2–5, 5–10, 10+ years) is outlined, establishing a replicable pathway for sustainable underground infrastructure in mountainous regions.</p>
🔗 Provenance — このレコードを発見したソース
- Research Square https://doi.org/10.21203/rs.3.rs-10021596/v1first seen 2026-06-20 04:51:53 · last seen 2026-06-21 04:45:00
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