泡沫改良粗粒渣土渗透性计算模型及适用性对比研究

doi:10.13722/j.cnki.jrme.2020.1141

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摘要盾构掘进过程中一旦渣土渗透性过大，极易出现喷涌现象，因此对于泡沫改良盾构渣土渗透性预测十分重要。提出基于泡沫改良土修正等效级配法的渗透系数理论计算模型，并结合大型渗透试验结果对比论述其与有效渗流通道法预测精度及适用范围的差异性。结果表明，2种方法的预测值均与实测值位于同一量级，且有效渗流通道法的预测值与实测值更接近，修正等效级配法的预测值偏大于实测值。从整体上看，修正等效级配法预测值的发展趋势与实测值保持“同增同减”，当泡沫改良土颗粒较粗时仍能与实测值保持较好的一致性。由于修正等效级配法未对泡沫改良土的改良状态提出要求，因此对土体粒径有更广的适用范围，易于在实际工程中推广应用。

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	王树英1
	令凡琳1
	黄硕2

关键词 ：土力学, 土压平衡盾构, 泡沫改良土, 渗透系数, 计算模型, 适用性

Abstract：In the process of shield tunnelling，once the permeability of conditioned soils is too high，it is easy to cause water spewing. Therefore，it is very important to predict the permeability of foam-conditioned soils. In this paper，a theoretical calculation model of the permeability coefficient of foam-conditioned soils was proposed based on the modified equivalent gradation method. Combined with the results of large permeability tests，the prediction accuracy and application range of the developed method were compared with the effective permeation channel method. The results show that the predicted permeability coefficients of the two methods are distributed in the same magnitude with the measured values. The predicted values by the effective permeation channel method are closer to the measured values，and the predicted values by the modified equivalent gradation method are larger than the measured values. On the whole，the predicted values by the modified equivalent gradation method maintain the same growth and reduce trend with the measured values，even for coarse-grained soils. Due to that the modified equivalent gradation method does not consider the conditioning states of foam-conditioned soils，it is applicable to a wider range of soil particle size and easy to be popularized in practical engineering applications.

Key words： soil mechanics earth pressure balance shield foam-conditioned soil permeability coefficient calculation model applicability

引用本文:

王树英1，令凡琳1，黄硕2. 泡沫改良粗粒渣土渗透性计算模型及适用性对比研究[J]. 岩石力学与工程学报, 2021, 40(11): 2357-2365.
WANG Shuying1，LING Fanlin1，HUANG Shuo2. A permeability calculation model of foam-conditioned coarse-grained soil and its applicability. , 2021, 40(11): 2357-2365.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.1141 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I11/2357

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