The study of foaming agent concentration choice in EPB shield soil conditioning

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Zhongtian Chen, Adam Bezuijen, Yong Fang, Markus Thewes, Dongzhu Zheng
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Abstract

Foam is widely used in soil conditioning during EPB shield tunnelling to ensure the efficiency and safety of face support and muck flow. Currently, the concentration of the foaming agent solution is chosen based on the recommendations of foaming agent suppliers, the half-life time of foam or the properties of the foam-soil mixture. This paper studies the foaming agent concentration (Cf) choice taking surface tension into consideration. Test results show that the Cf should be higher than the critical micelle concentration (CMC) to offset the influence of the expanding surface area during foam generation in shield tunnelling. The comparison between the capillary rise method and the platinum plate method shows that this offset can almost be accomplished when Cf is higher than 1% and fully accomplished when Cf is higher than 3%. Foam generation tests show that despite the differences in foam generation methods, the foaming ability of foaming agent solution and the stability of the generated foam are close to optimum at Cf of 1% and reach optimum at Cf of 3%. Slump tests show that foam with Cf lower than 1% is not stable enough in the foam-sand mixture for shield tunnelling. Both slump tests and field validation show that when Cf is higher than 3%, the increase of Cf has limited influence on soil conditioning performance.

Abstract Image

EPB盾构土调理中发泡剂浓度选择研究
在盾构掘进过程中,泡沫被广泛应用于土体调理,以保证工作面支护和泥石流的效率和安全。目前,发泡剂溶液的浓度是根据发泡剂供应商的建议、泡沫的半衰期或泡沫-土壤混合物的性质来选择的。本文研究了在考虑表面张力的情况下发泡剂浓度的选择。试验结果表明,为了抵消盾构隧道泡沫生成过程中表面面积膨胀的影响,Cf应高于临界胶束浓度(CMC)。毛细管上升法与铂板法的对比表明,当Cf值大于1%时,这种偏移几乎可以完成,当Cf值大于3%时,这种偏移完全完成。起泡试验表明,尽管起泡方式不同,发泡剂溶液的起泡能力和生成泡沫的稳定性在Cf = 1%时接近最佳,在Cf = 3%时达到最佳。坍落度试验表明,Cf值低于1%的泡沫砂混合料在盾构施工中不够稳定。坍落度试验和现场验证均表明,当Cf大于3%时,Cf的增加对土壤调节性能的影响有限。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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