Experimental Study on Characteristics of Filter Cake Formation in Slurry Shield Tunnelling Based on “Cutter-Soil” Interaction

IF 1.9 4区 工程技术 Q3 ENGINEERING, CIVIL
Yang Bai, Yapeng Li, Lei Li
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Abstract

In recent years, more and more river-crossing and sea-crossing underwater tunnels have become the first choice for the construction of large channels in regions with developed river system. Relying on its superior pressure control mode and high security, Slurry Pressure Balance shield (SPB) is widely used in the construction of underwater tunnels with large cross-sections. The filter cake is an important medium to guarantee the stability of the excavation in SPB tunnelling. However, the mechanism of cutter on soil and filter cake (the interaction of “cutter-soil”) are still unclear. In this study, a self-made test apparatus based on the interaction of “cutter-soil” is presented. The experiment results revealed that “cutter-soil” interaction, compared to cases without the interaction, reduced the impermeability and effective stress conversion rate of filter cake, which is unfavorable to guarantee the stability of the tunnel face. To overcome this problem, two methods were proposed: continuous injection of slurry with different densities and increasing the coarse particles of slurry. It is shown that the methods have improved filter the impermeability of cake formation, which contributes to the stability of the shield excavation face.

基于 "刀具-土壤 "相互作用的泥浆护盾掘进中滤饼形成特征的实验研究
近年来,越来越多的过江、过海水下隧道成为河流水系发达地区大型渠道建设的首选。泥浆压力平衡盾构机(SPB)凭借其优越的压力控制方式和较高的安全性,在大断面水下隧道施工中得到了广泛应用。滤饼是保证 SPB 隧道开挖稳定性的重要介质。然而,铣挖机对土壤和滤饼的作用机理("铣挖机-土壤 "相互作用)尚不清楚。本研究提出了一种基于 "铣挖机-土 "相互作用的自制试验装置。试验结果表明,"刀-土 "相互作用与无相互作用的情况相比,降低了滤饼的抗渗性和有效应力转换率,不利于保证隧道工作面的稳定性。为克服这一问题,提出了两种方法:连续注入不同密度的泥浆和增加泥浆的粗颗粒。结果表明,这两种方法都改善了滤饼形成的抗渗性,有助于盾构开挖面的稳定性。
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来源期刊
KSCE Journal of Civil Engineering
KSCE Journal of Civil Engineering ENGINEERING, CIVIL-
CiteScore
4.00
自引率
9.10%
发文量
329
审稿时长
4.8 months
期刊介绍: The KSCE Journal of Civil Engineering is a technical bimonthly journal of the Korean Society of Civil Engineers. The journal reports original study results (both academic and practical) on past practices and present information in all civil engineering fields. The journal publishes original papers within the broad field of civil engineering, which includes, but are not limited to, the following: coastal and harbor engineering, construction management, environmental engineering, geotechnical engineering, highway engineering, hydraulic engineering, information technology, nuclear power engineering, railroad engineering, structural engineering, surveying and geo-spatial engineering, transportation engineering, tunnel engineering, and water resources and hydrologic engineering
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