Green treatment technology of shield soil
Green treatment technology of shield soil
A large amount of shield soil will be discharged during the shield construction of the urban subways. The green treatment and recycling of the shield soil is one of the major concerns. Transporting and piling the shield soil is of high cost with large area occupation. At the same time, the shield soil containing various conditioning agents will cause environmental contamination in the piling process. In terms of the Earth Pressure Balance shield tunneling project of Xi'an Metro Line 10 in sandy strata, this study established a shield soil treatment system of separation of the shield soil into gravel, sand and clay for recycling, in order to increase the recycling rate of the shield soil and reduce piling. The results show that the shield soil treatment system operated by 8 workers can treat 800 m3 shield soil per day, which can effectively increase the excavation speed by 1.5 m/d. The conversion rate of gravel and sand is about 55.4%, and the conversion rate of slurry cakes is about 29.6%. Gravel and sand can be used as raw materials for shotcrete and shield grouting, and dried slurry cakes can be used as backfill materials of top slabs or raw materials for sintered products. The shield soil treatment system effectively makes the shield soil harmless and recycled.
X. Zhang; Y. Xiao; K. Zhu; Z. Wu; Yazhou; Z. Cao; R. Wang; a. Liming Hu
9th International Congress on Environmental Geotechnics (ICEG2023)
Sustainability
Ground Improvement
https://doi.org/10.53243/ICEG2023-317
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