岩土力学2017，Vol.38Issue(11)：3127-3135,9.DOI:10.16285/j.rsm.2017.11.007
吹填人工岛地基钙质粉土夹层的渗透特性研究
Study of permeability of calcareous silty layer of foundation at an artificial reclamation island
摘要
Abstract
The silty calcareous soil subgrade in the South China Sea contains fine particle calcareous silt interlayers with a particle size less than 0.075 mm.The permeability of these calcareous silt layers has an important effect on the development of underground fresh water in the islands.This study investigated correlations among the permeability coefficient,dry density and initial water content of calcareous silt through variable-head permeability tests in laboratory.The results demonstrate the reliability of Samarasinghe and Mesri formulas in calculating the permeability coefficient of calcareous silt.The variation of pore size of calcareous silty soil before and after infiltration test was analyzed by static nitrogen adsorption test.The results show that the permeability coefficient of calcareous silt decreases with the increase of the dry density,and increases with the increase of the initial water content.When the dry density is the same,and the permeability coefficient reaches the maximum at saturation.The Samarasinghe and Mesri formulae have high accuracy in calculating the permeability coefficient of calcareous silt.Seepage generates more micropores and transforms mesopores into macropores.The soil mainly shows pores with a uniform cylindrical hole with an opening at one end.This study provides a scientific reference for the calculation and analysis of groundwater seepage field in artificial reclamation island.关键词
钙质粉土/渗透系数/干密度/初始含水率/孔隙结构Key words
calcareous silt/permeability coefficient/dry density/initial water content/pore structure分类
建筑与水利引用本文复制引用
王新志,王星,胡明鉴,朱长歧,孟庆山,汪稔..吹填人工岛地基钙质粉土夹层的渗透特性研究[J].岩土力学,2017,38(11):3127-3135,9.基金项目
科技部973计划课题(No.2013CB956104) （No.2013CB956104）
自然科学基金项目(No.41572297,No.41572304,No.41372318)和国家科技支撑计划项目(No.2014BAC01B01).This work was supported by the National Key Basic Research Program of China (2013CB956104),the National Natural Science Foundation of China (41572297,41572304,41372318) and the National Key Technology R&D Program (2014BAC01B01). （No.41572297,No.41572304,No.41372318）
