Development of shield waste slurry-based tail grouting material for slurry pressure balance (SPB) tunneling: A geopolymer consolidation method

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-04-28 DOI:10.1016/j.tust.2025.106695

Tianhua Wu , Yongtao Gao , Changfu Huang , Yang Liu , Yi Xing , Yuandong Peng , Xiaocheng Qu , Yu Zhou

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引用次数: 0

Abstract

Owing to the substantial production of waste slurry in slurry pressure balance (SPB) shield tunneling, there is an urgent need to recycle SPB shield waste slurry (SWS). In this study, the proposed recycling method involves employing the geopolymer consolidation approach to develop an innovative SWS-based shield tail grouting material comprising SWS, geopolymers, and accelerators. Via the application of the Taguchi method, the optimal dosage ratio for the new grouting material was designed. An investigation was conducted to examine the influence of each component on the working and strength properties of the grouting material, and the results revealed that the most significant factor is the waste slurry specific gravity (WSSG). Moreover, the optimal grout formulation parameters included a WSSG of 1.10 g·cm⁻³, a geopolymer content (GC) of 95 %, and an accelerator content (AC) of 7 %, with the verification error of the results not exceeding 6 %. The microscopic hydration mechanisms of typical mixtures were qualitatively and quantitatively characterized via X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR), and the main gelatinous hydration structure identified is C-S-H gel. The optimal sample exhibited the highest Ca and Si concentrations of 43.21 %, and its Si-O stretching vibration band demonstrated the lowest wavenumber at 966.30 cm⁻¹. On-site industrial tests were performed against the backdrop of the Hengqin Mangzhou slurry shield tunnel (φ = 15.01 m), and the findings suggested that approximately 20.6 tons of SPB waste slurry is utilized for grouting per ring of segments. Compared with traditional mortar, the onsite production of the new grout is cost-effective, efficient, and environmentally friendly. Moreover, on the basis of real-time monitoring, ground-penetrating radar (GPR), and opening detection approaches, the new grouting material exhibited excellent deformation control (surface and segment) and high backfill density and effectiveness. In this study, effective in site resource reutilization of SPB SWS was achieved, which conforms with dual carbon goals.

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矿浆压力平衡（SPB）隧道用盾构废液基尾注浆材料的研制：一种地聚合物固结方法

由于料浆压力平衡盾构施工中产生大量废浆，迫切需要对料浆压力平衡盾构废浆进行回收。在本研究中，提出的回收方法包括采用地聚合物固结方法开发一种创新的基于SWS的盾构尾注浆材料，该材料由SWS、地聚合物和促进剂组成。应用田口法，设计了新型注浆材料的最佳掺量比。研究了各组分对注浆材料工作性能和强度性能的影响，结果表明，废浆比重（WSSG）是影响注浆材料工作性能和强度的最重要因素。优选的浆液配方参数为：WSSG为1.10 g·cm−3，地聚合物含量（GC）为95%，促进剂含量（AC）为7%，验证误差不超过6%。通过x射线衍射（XRD）、扫描电镜（SEM）和傅里叶变换红外（FTIR）对典型混合物的微观水化机理进行了定性和定量表征，确定了主要的胶状水化结构为C-S-H凝胶。最佳样品的Ca和Si浓度最高，为43.21%，其Si- o拉伸振动带在966.30 cm−1处波数最低。以横琴锰洲浆体盾构隧道（φ = 15.01 m）为背景进行现场工业试验，结果表明，每环管片注浆约使用20.6吨SPB废浆。与传统砂浆相比，现场生产新型砂浆具有成本效益高、效率高、环境友好等特点。通过实时监测、探地雷达和开孔检测等手段，新型注浆材料具有良好的地表和管段变形控制能力，充填密度高，充填效果好。在本研究中，SPB SWS实现了有效的场地资源再利用，符合双碳目标。

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来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.