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Mud pumping phenomenon is one of the major railways defects, which can cause uneven subgrade settlement and seriously affect track stability. The common method for repairing this problem is steady pressure grouting. Nonetheless, mud pumping creates complex pore channels by causing fine particles to migrate within the subgrade. As a result, particles are prone to block small channels, and the slurry often moves along the dominant channel under steady pressure. Consequently, the slurry diffusion range and grouting efficiency under steady pressure is limited. This study presents a new pulsating grouting technology that can generate self-induced pressure pulses. The grouting performance of the oscillating grouting technology is compared with that of steady pressure grouting. The results show that, under the same flow rate, the diffusion radius is increased by 15–30%. The effects of pulsating parameters, soil parameters and slurry parameters on diffusion distance are analyzed. The outcome of this research is expected to improve the efficiency and reinforcement effect of grouting technology, and it also provides a benchmark for the development of dynamic pressure grouting tools.

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Numerical Investigation on the Slurry Penetration Performance of Pulsating Pressure

  • 会议论文

  • 发表日期：

    2025年

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  • Lubo Tang,
  • Xiaobin Chen,
  • Jiasheng Zhang,
  • Jiarui Luo,
  • Fantong Lin

摘要

Mud pumping phenomenon is one of the major railways defects, which can cause uneven subgrade settlement and seriously affect track stability. The common method for repairing this problem is steady pressure grouting. Nonetheless, mud pumping creates complex pore channels by causing fine particles to migrate within the subgrade. As a result, particles are prone to block small channels, and the slurry often moves along the dominant channel under steady pressure. Consequently, the slurry diffusion range and grouting efficiency under steady pressure is limited. This study presents a new pulsating grouting technology that can generate self-induced pressure pulses. The grouting performance of the oscillating grouting technology is compared with that of steady pressure grouting. The results show that, under the same flow rate, the diffusion radius is increased by 15–30%. The effects of pulsating parameters, soil parameters and slurry parameters on diffusion distance are analyzed. The outcome of this research is expected to improve the efficiency and reinforcement effect of grouting technology, and it also provides a benchmark for the development of dynamic pressure grouting tools.