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The quality of the mud skin on the mud wall during construction is a key factor in preventing seepage. Through mud permeability tests, the ultimate impermeability pressure of mud skin was obtained under different permeability pressure differences, mud viscosity, static time, and average pore volume per particle. Based on the experimental results of mud infiltration to form impermeable mud skin, starting from the permeability pressure conditions and time evolution law of mud skin formation, the distribution law of effective mud wall protection pressure at different excavation stages of subway station underground continuous walls in water rich sand and gravel strata were studied. The research results indicate that the “hump” distribution pattern of mud wall pressure on the groove wall is the direct reason for the insufficient mud wall pressure near the excavation face, making the range of 5–10 meters above the excavation face a weak link instability. By reducing the excavation downward cutting speed, the stability control effect of the groove wall can be effectively improved. This study can provide scientific basis and practical guidance for the impermeability design of underground engineering in water rich sand and gravel formations.

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Research on the Anti Permeability Design Method of Slurry Wall Protection for Underground Continuous Wall Trenching in Rich Water Sand and Pebble Strata

  • 会议论文

  • 发表日期：

    2025年

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  • Shangming Zhu,
  • Zhaoping Song,
  • Hanzhi Piao,
  • Rubin Jia

摘要

The quality of the mud skin on the mud wall during construction is a key factor in preventing seepage. Through mud permeability tests, the ultimate impermeability pressure of mud skin was obtained under different permeability pressure differences, mud viscosity, static time, and average pore volume per particle. Based on the experimental results of mud infiltration to form impermeable mud skin, starting from the permeability pressure conditions and time evolution law of mud skin formation, the distribution law of effective mud wall protection pressure at different excavation stages of subway station underground continuous walls in water rich sand and gravel strata were studied. The research results indicate that the “hump” distribution pattern of mud wall pressure on the groove wall is the direct reason for the insufficient mud wall pressure near the excavation face, making the range of 5–10 meters above the excavation face a weak link instability. By reducing the excavation downward cutting speed, the stability control effect of the groove wall can be effectively improved. This study can provide scientific basis and practical guidance for the impermeability design of underground engineering in water rich sand and gravel formations.