Experimental study on the performance of shield tunnel tail grout in ground

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL
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引用次数: 0

Abstract

Shield tail grouting is an important measure to control tunnelling-induced ground deformation by injecting prepared grouting materials to fill the tail gap. The working performance of grout is usually invisible and hard to obtain in construction. This paper carries out an experimental study to investigate the tail grout behavior in ground. In the current research, a testing device is developed to explore the grout behavior in varying soils. The grout working performance is evaluated not only by the liquid grout properties such as fluidity, consistency, bleeding rate, stone rate and compressed deformation but also solid grout properties such as unconfined compressive strength and permeability. Three typical grouts are chosen and their behaviors in the various soils are observed. To take an insight on the behaviors, scanning electron microscopy and mercury intrusion porosimetry analysis are employed. The microstructure of solid grout is a sign of its working performance. The observation shows that the solid grout micro-structure is influenced by grout proportions, pressure, and ground permeabilities. The experimental results are applied in the case of Beijing Metro Line 12 for validation and as a result, the ground movement is inhibited due to high performance of tail grout.
盾构隧道尾部注浆在地层中的性能试验研究
盾尾注浆是通过注入配制好的注浆材料来填充盾尾间隙,从而控制掘进引起的地面变形的一项重要措施。灌浆料的工作性能通常是不可见的,在施工中很难获得。本文通过实验研究了尾部注浆在地层中的行为。在当前的研究中,开发了一种测试装置来探索灌浆材料在不同土壤中的行为。灌浆料的工作性能不仅通过液体灌浆料的流动性、稠度、出血率、结石率和压缩变形等性能进行评估,还通过固体灌浆料的无侧限抗压强度和渗透性等性能进行评估。我们选择了三种典型的灌浆料,并观察了它们在不同土壤中的表现。为了深入了解这些行为,采用了扫描电子显微镜和汞侵入孔隙模拟分析。固体灌浆料的微观结构是其工作性能的标志。观察结果表明,固体灌浆料的微观结构受灌浆料比例、压力和地层渗透性的影响。实验结果应用于北京地铁 12 号线进行验证,结果表明,由于尾部灌浆料的高性能,地面运动受到抑制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Underground Space
Underground Space ENGINEERING, CIVIL-
CiteScore
10.20
自引率
14.10%
发文量
71
审稿时长
63 days
期刊介绍: Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.
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