Evaluation of temporarily flowable self-compacting backfill materials in large-scale sewer applications in Germany

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

Tunnelling and Underground Space Technology Pub Date : 2025-06-23 DOI:10.1016/j.tust.2025.106754

Nicole Kimmling , Matteo Rubinato , Bert Bosseler , Martin Liebscher , Mark Klameth , Mirko Salomon , Serdar Ulutas

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引用次数: 0

Abstract

Ground subsidence due to inadequate compaction of backfill materials and damaged sewer pipelines poses significant risks to urban infrastructure. This study evaluates the performance of Temporarily Flowable Self-Compacting Backfill (TFSB) materials in large-scale sewer applications, addressing key properties such as flowability, volume stability, re-excavation capability, and recyclability. Five TFSB formulations were experimentally assessed using a large-scale test rig replicating real-world sewer construction conditions. The study employed a multi-criteria evaluation framework, integrating innovative testing methodologies such as the Mini-MAC system for pipe-soil stiffness measurement and a walkability test to determine early load-bearing capacity.

Results demonstrated substantial variability in TFSB performance. While certain formulations exhibited superior flowability and bedding continuity, others faced challenges related to post-hardening and re-excavation difficulty. Compressive strength measurements revealed that materials exceeding 0.3 N/mm² at 28 days hindered future removability, necessitating formulation adjustments for optimal structural integrity and maintainability. Additionally, environmental assessments identified gaps in existing standards, emphasizing the need for regulatory updates tailored to TFSB-specific properties.

This research provides actionable insights for network operators and industry stakeholders, offering a framework for optimizing TFSB formulations to enhance urban infrastructure resilience. The findings contribute to the development of standardized guidelines for TFSB applications, promoting cost-effective, sustainable, and structurally reliable backfill solutions for sewer construction.

查看原文本刊更多论文

临时可流动自密实回填材料在德国大规模下水道应用的评价

由于回填材料压实不足和污水管道损坏造成的地面沉降对城市基础设施构成重大风险。本研究评估了临时可流动自密实回填（TFSB）材料在大规模下水道应用中的性能，包括流动性、体积稳定性、再开挖能力和可回收性等关键性能。五种TFSB配方通过模拟真实下水道施工条件的大型试验台进行了实验评估。该研究采用了多标准评估框架，整合了创新的测试方法，如用于管道-土壤刚度测量的Mini-MAC系统和用于确定早期承载能力的可行走性测试。结果显示，TFSB的表现有很大的可变性。虽然某些配方表现出优越的流动性和层理连续性，但其他配方面临与后硬化和再开挖困难相关的挑战。抗压强度测量显示，28天内超过0.3 N/mm2的材料会阻碍未来的可移除性，因此需要调整配方以获得最佳的结构完整性和可维护性。此外，环境评估发现了现有标准中的差距，强调需要针对tfsb的特定特性进行监管更新。本研究为网络运营商和行业利益相关者提供了可操作的见解，提供了优化TFSB配方以增强城市基础设施弹性的框架。研究结果有助于制定TFSB应用的标准化指南，促进具有成本效益，可持续和结构可靠的下水道回填解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.