Recycling of Shield Muck with Industrial Solid Wastes for Low-Carbon Synchronous Grouting Materials: A Full Case Study from Laboratory Investigation to Field Implementation

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬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.

本研究では、高炉水砕スラグ、脱硫石膏、石炭フライアッシュを用いてシールドトンネル掘削土を固化し、現場での同時注入材の調製を行った。固化材含有量（CAC）と泥土懸濁液密度（SD）がグラウト特性に及ぼす影響を詳細に調査した。応答曲面法を採用し、これら2因子の複合効果下での性能応答を正確に反映する非線形応答モデルを構築した。さらに、SEM、XRD、ゼータ電位測定により微視的な水和メカニズムを分析した。NSGA-Ⅲアルゴリズムを用いて、グラウト構成要素（固化材、土粒子、水）の体積分率を最適化した。最適化された配合比は、その後、実規模の工学的適用を通じて検証された。結果は、SDとCACがグラウト性能に有意な非線形複合効果を及ぼすことを示している。このジオポリマー系は、粘性土を豊富に含むシールド泥土懸濁液に対して優れた固化性能を発揮する。その28日間一軸圧縮強度（UCS）は最大9.1 MPa、平均値2.89 MPaに達し、従来のセメント-フライアッシュグラウトが達成した1.17 MPaを著しく上回る。力学的性能を主な考慮事項として、最適な体積分率は、水71.08%、固化材6.19%、土粒子22.72%と決定された。グラウトの含水量は、セメント系前駆体の活性化度と形成される水和生成物の種類を直接支配する。より高いSDはより完全な水和を促進するが、より大きな細孔構造を誘発する可能性がある。現場試験の結果は、従来のセメント-フライアッシュ系同時注入材と比較して、新規グラウトはセグメント浮上を30〜40%低減し、注入圧力を10〜15%低下させ、それによって周辺地盤への擾乱を弱めることを実証している。その優れた流動性と高い充填効率により、注入量は15〜20%増加する。

AI 翻訳（deepseek-v4-flash）。 正確を期す場合は下の原文を参照してください。

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%.

• openalex https://doi.org/10.1016/j.cscm.2026.e06313first seen 2026-07-13 05:54:53