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Purpose <p>The purpose of this study was to improve the treatment efficiency of high water content dredged sediments by exploring a new approach that combines intermittent vacuum preloading with a straw drainage system.</p> Materials and methods <p>Laboratory model tank tests were conducted on dredged sediment using varying vacuum preloading methods, including continuous and intermittent modes with different durations (6, 12, 18 and 24&#xa0;h). A novel straw drainage system was employed and compared to traditional prefabricated vertical drains methods. The treatment efficiency was evaluated by monitoring vacuum pressure transmission, cumulative water discharge, shear strength, water content, and assessing filter fabric clogging through microscopic analysis.</p> Results and discussion <p>Intermittent vacuum preloading significantly reduced filter fabric clogging in the straw drainage system, leading to enhanced vacuum pressure transmission efficiency (11.1–38.8%) and improved consolidation. While gradual straw degradation caused a later decrease in pressure transmission (14.6–28.1%), intermittent loading still resulted in superior performance compared to continuous vacuum. Notably, a 12-hour intermittent cycle yielded a 23% increase in cumulative water discharge, a 55.5% rise in shear strength, and a 10.9% reduction in water content relative to traditional vacuum loading.</p> Conclusions <p>Compared to the traditional continuous loading method (T1), the 12-hour intermittent method with the straw drainage system increased the final shear strength by 55.5% and the cumulative water discharge by 23.0%, demonstrating its superior performance in treating dredged sediment.</p>

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Effect of straw-based vertical drains on consolidation of dredged sediment under intermittent vacuum preloading

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Junjun Ni,
  • Shusen Liu,
  • Mengying Gao,
  • Qiyuan Han,
  • Jiaxing Weng,
  • Dan Zhang

摘要

Purpose

The purpose of this study was to improve the treatment efficiency of high water content dredged sediments by exploring a new approach that combines intermittent vacuum preloading with a straw drainage system.

Materials and methods

Laboratory model tank tests were conducted on dredged sediment using varying vacuum preloading methods, including continuous and intermittent modes with different durations (6, 12, 18 and 24 h). A novel straw drainage system was employed and compared to traditional prefabricated vertical drains methods. The treatment efficiency was evaluated by monitoring vacuum pressure transmission, cumulative water discharge, shear strength, water content, and assessing filter fabric clogging through microscopic analysis.

Results and discussion

Intermittent vacuum preloading significantly reduced filter fabric clogging in the straw drainage system, leading to enhanced vacuum pressure transmission efficiency (11.1–38.8%) and improved consolidation. While gradual straw degradation caused a later decrease in pressure transmission (14.6–28.1%), intermittent loading still resulted in superior performance compared to continuous vacuum. Notably, a 12-hour intermittent cycle yielded a 23% increase in cumulative water discharge, a 55.5% rise in shear strength, and a 10.9% reduction in water content relative to traditional vacuum loading.

Conclusions

Compared to the traditional continuous loading method (T1), the 12-hour intermittent method with the straw drainage system increased the final shear strength by 55.5% and the cumulative water discharge by 23.0%, demonstrating its superior performance in treating dredged sediment.