Study on Key Technologies of Layered Filling Subgrade with Shield Drilling Sludge

DOI

10.2991/978-94-6239-682-1_22How to use a DOI?

Keywords

Shield drilling sludge; Layered filling; Pretreatment modification; Compaction quality; Resource utilization

Abstract

With the rapid development of urban rail transit and tunnel engineering, the output of shield drilling sludge is increasing year by year, posing urgent challenges for waste disposal and resource sustainability. The resource utilization of shield drilling sludge as subgrade filling material offers dual benefits of solving environmental pollution from sludge stacking and reducing reliance on traditional filling materials. However, existing research lacks targeted technical systems for applying shield drilling sludge—characterized by high moisture content, fine particle size, and poor stability—to layered subgrade filling. Moreover, the integration of pretreatment, compaction, and quality control technologies for this specific waste material remains underdeveloped. This study systematically investigates the key technologies of layered filling subgrade with shield drilling sludge. First, the physical and mechanical properties of the sludge (particle size distribution, moisture content, compaction characteristics, shear strength) are analyzed; then, core technologies including sludge pretreatment, layered compaction, and quality control are optimized; finally, field tests are conducted to verify the engineering effect. Results show that after pretreatment (natural drying + mechanical dehydration + 6% lime modification + screening) and scientific layered compaction (25cm layer thickness, 20t vibratory roller, “static-vibratory-static” process), the sludge meets subgrade filling requirements. The filled subgrade exhibits compaction degree (≥93.5%), bearing capacity (dynamic cone penetration resistance ≥185kPa), and stability (total settlement 8-12mm) that comply with design standards, with no significant environmental impact. This study fills the technical gap in targeted application of shield drilling sludge to subgrade engineering and provides a feasible technical framework for its resource utilization, contributing to sustainable construction practices.

Copyright

© 2026 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Tengda Gao
AU  - Yanan Zhang
AU  - Jianyong Zhang
AU  - Liyong Zhang
AU  - Wei Huang
AU  - Peng Chen
PY  - 2026
DA  - 2026/06/30
TI  - Study on Key Technologies of Layered Filling Subgrade with Shield Drilling Sludge
BT  - Proceedings of the 2025 7th International Conference on Civil Architecture and Urban Engineering (ICCAUE 2025)
PB  - Atlantis Press
SP  - 217
EP  - 226
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6239-682-1_22
DO  - 10.2991/978-94-6239-682-1_22
ID  - Gao2026
ER  -