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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Model test study on vacuum preloading treatment of soft soil with combined vertical drain

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联合竖向排水体真空预压处理软土模型试验研究

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Oct.2025, Vol.48 No.10: 1364-1370, 1377

DOI: 10.3969/j.issn.1003-5060.2025.10.010

Authors

CHU Chengfu, CAI Hurong, ZONG Wenqiang

(School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: In this paper, the shortcomings of prefabricated vertical drain(PVD) used in the current consolidation and drainage of soft soil are addressed, and considering the reasonable utilization of industrial waste tailings sand and crop straw, a combined vertical drain(CVD) is proposed using drainage boards, tailings sand, and cotton straw as raw materials. The differences in vacuum preloading treatment of soft soil between CVD and conventional PVD were studied through self-designed indoor model tests. The results show that compared to PVD, the vacuum attenuation of soft soil treated with CVD decreases by an average of 37.11%, the maximum dissipation of pore water pressure increases by 27.56%, the drainage rate can increase by up to 1.5 times, and the surface settlement increases by 37.02%. Compared to PVD, the average moisture content of soft soil treated with CVD is reduced by 6.65%, the average value of vane shear strength increases by 8.34 kPa, and the physical properties of soil at different locations are less different. The study proves that using CVD to treat soft soil is feasible and has better drainage and consolidation effects than PVD.

Keywords: combined vertical drain (CVD); drainage consolidation method; soft soil; indoor model test; waste utilization

作者信息

储诚富，蔡沪荣，宗文强

（合肥工业大学资源与环境工程学院，安徽合肥230009）

摘要和关键词

摘要: 文章针对当前软土固结排水中所用塑料排水板(prefabricated vertical drain, PVD)存在的缺陷,综合考虑工业废料尾矿砂和农作物秸秆的合理利用,提出以排水板、尾矿砂和棉花秸秆为原材料制成联合竖向排水体(combined vertical drain, CVD);通过自行设计的室内模型试验,研究CVD和普通PVD真空预压处理软土的差异性。试验结果表明:相比于PVD,使用CVD处理软土时真空度衰减平均降低37.11%,孔隙水压力消散最大值提升27.56%,排水速率最大可提高1.5倍,表层沉降增加37.02%;相比于PVD,使用CVD处理后的软土平均含水率多降低6.65%,十字板剪切强度平均值提升8.34 kPa,不同位置土体的物理性质差异更小。试验研究证明,使用CVD处理软土是可行的,具有比PVD更好的排水固结效果。

关键词: 联合竖向排水体（CVD）；排水固结法；软土；室内模型试验；废物利用

Funding

国家自然科学基金资助项目（42172307）

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