岩土工程学报2025，Vol.47Issue(2)：243-254,12.DOI:10.11779/CJGE20231124
考虑泊松效应的流泥轴对称真空过滤理论
Radial filtration model for prefabricated vertical drain treatment of slurry considering Poisson's effects
摘要
Abstract
During the vacuum preloading treatment of slurry ground,the significant improvement is only observed in the soil adjacent to the prefabricated vertical drain(PVD),resulting in the formation of a protruding"soil column"with the PVD as its axis.The presence of soil column,as a unique phenomenon of slurry ground pre-treatment,leads to severe clogging and ineffective treatment results.An axisymmetric vacuum filtration model is established in the coordinate system using the continuity,kinematic and equilibrium equations for both liquid and solid phases of slurry.The moving boundary condition and Poisson's effects associated with the soil column are also incorporated.The growth pattern and clogging behavior of soil columns are investigated through the model and verified by comparing the predicted results with the particle image velocity(PIV)ones.The results show that reduction of permeability coefficient within the soil column is up to 97%,indicating that the dense soil column is the essence of clogging.Furthermore,notable influences of the Poisson's effects and negative pressure on the growth and compression behavior of the soil column are observed.The low amplitude negative pressure promotes formation of the relatively small loose soil columns,thereby mitigating the clogging behavior.关键词
流泥/真空预压/过滤/土柱/淤堵/固结/泊松效应Key words
slurry/vacuum preloading/filtration/soil column/clogging behavior/consolidation/Poisson's effect分类
建筑与水利引用本文复制引用
蔡袁强,叶晓倩,史吏..考虑泊松效应的流泥轴对称真空过滤理论[J].岩土工程学报,2025,47(2):243-254,12.基金项目
离岸岛群深厚软土地基交通基础设施建设关键技术(2023YFB2604200) （2023YFB2604200）
国家自然科学基金项目(52278377,U2006225) （52278377,U2006225）
浙江省自然科学基金项目(LZ22E080009) （LZ22E080009）
