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Experimental Study on the Road Performance of Geopolymer-based
Solidifiable Fluid Shield Waste Slurry
(1. China State Construction International Holdings Limited, Hong Kong 999077; 2. China State Civil Engineering Ltd.,
Hong Kong 999077; 3. China Construction Civil Engineering Co. Ltd, Hong Kong 999077; 4. College of Civil and
Transportation Engineering, Hohai University, Nanjing 210098; 5. College of Civil and Transportation Engineering, Shenzhen
University, Shenzhen 518060; 6. State Key Laboratory of Intelligent Geotechnics and Tunnelling, Shenzhen 518060;
7. Shenzhen Key Laboratory of Green, Efficient, and Intelligent Construction of Underground Metro Station, Shenzhen 518060)
Abstract The disposal of waste slurry generated during urban tunnel construction is challenging, while road construction often faces a shortage of fill materials. To achieve the resource utilization of shield slurry, this study explores and verifies the feasibility of the geocell-reinforced geopolymer solidification technology for the disposal of shield slurry. By comparing the solidification effects of geopolymer and cement on waste slurry, the study comprehensively evaluates the static and dynamic properties of the solidified materials, and analyzes their suitability as subgrade fill materials based on road performance criteria. The results indicate that: (1) Geopolymer solidification exhibits a faster strength development rate compared to cement solidification, with a strength increase of 42% to 238%,making it more likely to meet road strength requirements. (2) The introduction of geocells not only significantly enhances the strength of the solidified soil but also shifts the failure mode from plastic failure to elastic failure. It reduces both plastic and elastic strain under cyclic loading, and under 10,000 cycles of the load with 400 kPa, the geopolymer-solidified sample accumulates less than 0.6% plastic strain, demonstrating superior dynamic performance.(3) When dynamic stress exceeds 600 kPa, the deformation between the embossed surface of the geocell and the solidified soil becomes non-coordinated, leading to cyclic shear damage at the contact interface, though no significant adverse effects on normal road use are observed.
Abstract：
The disposal of waste slurry generated during urban tunnel construction is challenging, while road construction often faces a shortage of fill materials. To achieve the resource utilization of shield slurry, this study explores and verifies the feasibility of the geocell-reinforced geopolymer solidification technology for the disposal of shield slurry. By comparing the solidification effects of geopolymer and cement on waste slurry, the study comprehensively evaluates the static and dynamic properties of the solidified materials, and analyzes their suitability as subgrade fill materials based on road performance criteria. The results indicate that: (1) Geopolymer solidification exhibits a faster strength development rate compared to cement solidification, with a strength increase of 42% to 238%,making it more likely to meet road strength requirements. (2) The introduction of geocells not only significantly enhances the strength of the solidified soil but also shifts the failure mode from plastic failure to elastic failure. It reduces both plastic and elastic strain under cyclic loading, and under 10,000 cycles of the load with 400 kPa, the geopolymer-solidified sample accumulates less than 0.6% plastic strain, demonstrating superior dynamic performance.(3) When dynamic stress exceeds 600 kPa, the deformation between the embossed surface of the geocell and the solidified soil becomes non-coordinated, leading to cyclic shear damage at the contact interface, though no significant adverse effects on normal road use are observed.
2025, Vol. 62 