水头对泡沫砂渗透率影响的实验与分析研究

IF 3.3 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Soils and Foundations Pub Date : 2023-11-28 DOI:10.1016/j.sandf.2023.101404
Shuying Wang , Zhiyao Feng , Tongming Qu , Shuo Huang , Xiangcou Zheng
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引用次数: 0

摘要

条件土的透水性是粗粒土中土压平衡隧道施工最重要的特性之一。通过渗透率试验研究了水头对泡沫砂渗透率的影响。泡沫砂的初始渗透系数随水头增大而增大,稳定渗透系数和初始稳定期持续时间减小。同时,提出了一种估算初始渗透率系数的解析模型。在该模型中,通过计算不同水压下泡沫的孔隙率和泡沫的有效直径,考虑了水头对初始渗透系数的影响。实验结果与解析解吻合较好,表明了所提计算方法的优良性能。此外,从泡沫气泡的收缩与演化出发,探讨了水头影响泡沫条件砂渗透率的物理机制。
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Effect of water head on the permeability of foam-conditioned sands: Experimental and analytical investigation

The water permeability of conditioned soils is one of the most essential properties for Earth Pressure Balance (EPB) tunnelling in coarse-grained soils. Permeability tests are conducted to study the influence of water heads on the permeability of foam-conditioned sands. The initial permeability coefficient of foam-conditioned sands increases with the water head, while the stable permeability coefficient and the initial stable period duration decrease. Meanwhile, a novel analytical model is proposed to estimate the initial permeability coefficient. In this model, the effect of the water head on the initial permeability coefficient is incorporated by calculating void ratios of the foam and effective diameters of foam bubbles under different water pressures. Experimental results are in close agreement with analytical solutions, indicating the excellent performance of the proposed calculation method. In addition, the physical mechanisms of how the water head affects the permeability of foam-conditioned sands are discussed from the contraction and evolution of foam bubbles.

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来源期刊
Soils and Foundations
Soils and Foundations 工程技术-地球科学综合
CiteScore
6.40
自引率
8.10%
发文量
99
审稿时长
5 months
期刊介绍: Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.
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