Recycling of Shield Muck with Industrial Solid Wastes for Low-Carbon Synchronous Grouting Materials: A Full Case Study from Laboratory Investigation to Field Implementation
シールド掘削泥の産業固形廃棄物を用いた低炭素同時注入材へのリサイクル：実験室調査から現場実装までの完全な事例研究 (AI 翻訳)
Weizheng Liu, Guiyong Liu, Yijun Yang, Tianshe Sun
🤖 gxceed AI 要約
日本語
本研究は、シールドトンネル掘削時に発生する泥水（シールド泥）を産業固形廃棄物（高炉スラグ、脱硫石膏、石炭フライアッシュ）と組み合わせて、低炭素の同時注入材を現場調製する方法を提示した。応答曲面法とNSGA-IIIアルゴリズムを用いて最適配合比を決定し、実現場で検証した結果、従来のセメント系材料と比べてCO2排出量を削減しつつ、セグメント浮き上がりを30-40%低減し、注入圧力を10-15%低下させるなど、性能が向上した。
English
This study presents a method for recycling shield tunnel muck with industrial solid wastes (slag, desulfurized gypsum, coal fly ash) to produce low-carbon synchronous grouting materials on-site. Using response surface methodology and NSGA-III algorithm for optimization, the field test showed reduced CO2 emissions, 30-40% reduction in segment uplift, 10-15% lower injection pressure, and 15-20% increase in grouting volume compared to conventional cement-based grout.
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
日本の建設業界では、トンネル工事から発生する建設廃棄物の処理とCO2排出削減が課題となっている。本研究成果は、シールド泥をリサイクルして低炭素な注入材を現場調製する手法を提供し、日本のゼロエミッション建設や循環型社会形成に貢献する可能性がある。また、応答曲面法や最適化アルゴリズムの適用事例としても参考になる。
In the global GX context
Globally, the construction sector seeks circular economy solutions to reduce waste and carbon emissions. This case study demonstrates a scalable method for converting tunnel spoil into low-carbon grouting materials, with proven field performance. It offers a replicable model for infrastructure projects aiming to meet net-zero targets and reduce material costs.
👥 読者別の含意
🔬研究者:The methodology combining response surface methodology and NSGA-III for optimizing waste-based geopolymer grouts can be applied to other construction waste recycling research.
🏢実務担当者:Construction firms can adopt this on-site grout preparation technique to reduce material procurement costs, lower carbon footprint, and improve tunnel construction efficiency.
🏛政策担当者:The study provides evidence to support policies promoting the use of industrial solid wastes in construction and mandating low-carbon alternatives in infrastructure projects.
📄 Abstract（原文）
This study employs ground-granulated blast-furnace slag, desulfurized gypsum, and coal fly ash to solidify shield-tunneling muck for the on-site preparation of synchronous grouting materials. The influences of curing-agent content (CAC) and muck suspension density (SD) on the grout properties were investigated in detail. The response surface methodology was adopted to establish nonlinear response models that accurately reflect the performance responses under the coupled effects of these two factors. Additionally, the microscopic hydration mechanism was analyzed via SEM, XRD and Zeta potential measurements. The NSGA-Ⅲ algorithm was utilized to optimize the volume fractions of grout components (curing agent, soil particles, and water). The optimized mix proportion was subsequently validated through full-scale engineering applications. The results indicate that SD and CAC exert a significant nonlinear coupling effect on the grout performance. This geopolymer system delivers excellent solidification performance for mucky clay-rich shield muck suspensions. Its 28-day unconfined compressive strength (UCS) reaches a maximum of 9.1 MPa with an average value of 2.89 MPa, which is markedly higher than the 1.17 MPa achieved by conventional cement–fly ash grout. With mechanical performance as the primary consideration, the optimal volume fractions are determined as 71.08% water, 6.19% curing agent, and 22.72% soil particles. The water content of the grout directly governs the activation degree of cementitious precursors and the types of hydration products formed; a higher SD promotes more thorough hydration but may induce larger pore structures. Field test results demonstrate that, compared with conventional cement-fly ash-based synchronous grouting materials, the novel grout reduces segment uplift by 30–40% and lowers injection pressure by 10–15%, thus weakening the disturbance to the surrounding soil. Owing to its excellent flowability and high filling efficiency, the grouting volume is increased by 15–20%.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.cscm.2026.e06313first seen 2026-07-13 05:54:53
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