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余俊, 郑靖凡, 张志中, 李东凯, 和振. 考虑推进过程的土压平衡盾构渗流场解析解及喷涌判别[J]. 岩土工程学报, 2024, 46(10): 2101-2110. DOI: 10.11779/CJGE20230633
引用本文: 余俊, 郑靖凡, 张志中, 李东凯, 和振. 考虑推进过程的土压平衡盾构渗流场解析解及喷涌判别[J]. 岩土工程学报, 2024, 46(10): 2101-2110. DOI: 10.11779/CJGE20230633
YU Jun, ZHENG Jingfan, ZHANG Zhizhong, LI Dongkai, HE Zhen. Analytical solution for seepage field and spewing discrimination during propulsion process of earth pressure balance shield[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(10): 2101-2110. DOI: 10.11779/CJGE20230633
Citation: YU Jun, ZHENG Jingfan, ZHANG Zhizhong, LI Dongkai, HE Zhen. Analytical solution for seepage field and spewing discrimination during propulsion process of earth pressure balance shield[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(10): 2101-2110. DOI: 10.11779/CJGE20230633

考虑推进过程的土压平衡盾构渗流场解析解及喷涌判别

Analytical solution for seepage field and spewing discrimination during propulsion process of earth pressure balance shield

  • 摘要: 考虑推进过程中盾构正面附加推力产生的超孔隙水压力,用解析的方法分析了盾构喷涌问题。将土舱渗流场划分成两个区域,利用叠加原理和分离变量法得到土舱水头显式级数解,将螺旋输送机内流场视为一维渗流,通过土舱与螺旋输送机交界面的连续条件确定盾构渗流场解析解。通过数值模拟结果验证了解的正确性,并进行了参数分析。参数分析表明:正常掘进状态下的盾构推力波动频率与渣土固结系数比值近似为0.1~10 m-2,可对应于渗透系数10-3~10-5 cm/s,当比值大于20 m-2,可以忽略超孔隙水压力的影响,比值小于0.01 m-2时,水压力分布近似稳态渗流状态,但比值在1 m-2附近时,超孔隙水压力将存在显著的影响。结合已有的喷涌研究,给出了典型盾构在不同推力波动频率与土体固结系数比值下的临界渗透系数。通过对盾构喷涌实例进行对比,证明了解析解的喷涌判别是有效的。

     

    Abstract: Considering the excess pore water pressure generated by the additional thrust on the shield front during the propulsion process, the shield spewing problem is analyzed by the analytical method. The seepage field in soil chamber is divided into two regions, the superposition principle and the separation variable method are used to obtain the explicit level solution for the water head in the soil chamber, the flow field inside the screw conveyor is regarded as one-dimensional seepage, and the analytical solution for the shield seepage field is determined by using the continuity condition of the intersection between the soil chamber and the screw conveyor. The correctness of the solution is verified through the numerical simulation results, and the parameters are analyzed. The parameter analysis shows that the ratio of shield thrust fluctuation frequency to soil consolidation coefficient in the normal tunneling state is about 0.1~10 m-2, which corresponds to the permeability coefficient 10-3~10-5 cm/s, when the ratio is greater than 20 m-2, the influences of the excess pore water pressure can be ignored, and when the ratio is less than 0.01 m-2, the water pressure distribution approximates in the steady-state seepage state, but for the ratio near 1 m-2, the excess pore water pressure will have a significant impact. Combined with the existing spewing researches, the critical permeability coefficient of a typical shield in different ratios thrust fluctuation frequency to soil consolidation coefficient is given. By comparing the shield spewing examples, the spewing discrimination of the analytical solution is proved to be effective.

     

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