Decarbonizing the Geological Premium: A Scenario-Based Carbon Footprint Assessment of Low-Carbon Vertical Nodes in Microtunneling Projects
脱炭素化と地質学的プレミアム：マイクロトンネル工事における低炭素垂直節点のシナリオベース炭素フットプリント評価 (AI 翻訳)
Wen-Sheng Ou
🤖 gxceed AI 要約
日本語
台湾花蓮の硬質礫層における立坑建設のA1–A5炭素排出を評価。地質学的プレミアム（機械エネルギー増加）と強制炭素ロックイン効果（高強度構造物必然化）を特定。ジオポリマー製プレキャストマンホール（セメント50%代替）によるグリーンプレミアムで相殺可能であることをシナリオ検証。グリーン公共調達への示唆を提供。
English
This study conducts a scenario-based carbon footprint assessment (A1-A5) of microtunneling shafts in hard gravel formations in Hualien, Taiwan. It identifies a 'Geological Premium' from increased machinery energy and a 'Forced Carbon Lock-in Effect' from high-strength structures. Empirical results show product stage (A1-A3) accounts for 51.1% and construction (A5) for 42.5% of emissions. Geopolymer precast manholes (50% cement replacement) can neutralize the geological premium, informing Green Public Procurement policies.
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
土木工事のLCAは日本のGX実践でも重要な領域だが、本論文は特に地質条件に着目した点で独自性がある。日本でも同様の地質リスク評価が求められるが、台湾事例であり直接の政策適用には地域調整が必要。建設分野の脱炭素化における国際比較の参考となる。
In the global GX context
This paper advances LCA methodology for underground infrastructure by incorporating geological variables, a factor often overlooked in global carbon accounting. The concept of 'Geological Premium' and 'Forced Carbon Lock-in' is novel and relevant for green procurement frameworks globally, though the empirical setting is Taiwan. It provides evidence for material substitution strategies in hard-rock conditions.
👥 読者別の含意
🔬研究者:Fills a gap in LCA for vertical nodes in extreme geology, offering a methodological framework for incorporating geological variables.
🏢実務担当者:Demonstrates that geopolymer precast manholes can offset carbon premiums in challenging ground conditions, a practical mitigation strategy.
🏛政策担当者:Supports inclusion of geological variables and low-carbon materials in Green Public Procurement (GPP) criteria for infrastructure.
📄 Abstract（原文）
Trenchless technologies are critical for global urban sewerage construction; however, existing Life Cycle Assessments (LCA) predominantly focus on horizontal segments under standard soft soil conditions, neglecting the massive embodied carbon of "vertical nodes" in extreme geology. Based on EN 15804, this study conducts an upfront carbon (A1–A5) inventory and scenario analysis of microtunneling shafts in Hualien, Taiwan, characterized by deep excavations (10–12 m) and hard gravel formations (SPT N > 50). The research reveals a dual climate challenge induced by extreme geology: the "Geological Premium" resulting from increased machinery energy consumption, and the "Forced Carbon Lock-in Effect" triggered by the necessity of high-strength permanent structures. Empirical results demonstrate that the product stage (A1–A3) of vertical nodes accounts for 51.1% of total emissions, while the construction stage (A5) contributes 42.5%. Consequently, a material-based compensation mechanism is proposed. Scenario simulations verify that introducing geopolymer precast manholes (50% cement replacement) generates a "Green Premium" that effectively neutralizes the construction's geological premium. This study fills the LCA gap for underground infrastructure, providing scientific support for integrating geological variables and low-carbon materials into Green Public Procurement (GPP) policies.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.20944/preprints202605.1049.v1first seen 2026-05-20 05:06:34 · last seen 2026-06-14 04:44:47
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