成都理工大学学报（自然科学版）2024，Vol.51Issue(6)：1070-1080,11.DOI:10.3969/j.issn.1671-9727.2024.06.14
廊坊地面沉降区黏性土渗透系数计算
Calculation of the permeability coefficient of clay soil in the Langfang land subsidence area
摘要
Abstract
Clay soil can be found in the weak permeable layer of underground aquifer systems,which has the function of blocking water flow and solute migration.The question of how to obtain the hydraulic parameters of weak permeable layer has gradually become a research hotspot.The permeability coefficient of clay soil is an important hydraulic parameter in the calculation of groundwater seepage and consolidation.In this work,through borehole sampling and geotechnical test,the permeability coefficient and other geotechnical test data of 52 groups of clay soil samples buried within 75 m of the Langfang settlement area are obtained.The test data show that within a 75 m burial depth,the permeability coefficient of the clay soil varies from(0.001 5～0.350 0)× 10-6 cm/s,and is sensitive to the clay content;with an increase of clay content,the permeability coefficient decreases.Combined with the analysis of the composition and structure of the clay soil,the effective porosity ratio is calculated using an empirical equation and conventional geotechnical indices.Then,the permeability coefficient is found using a modified version of the Kozeny-Carman equation.The results show that the value of Kprediction/K measurement falls between 0.25 and 8.25.The reliability of the empirical equation derived and used to calculate the effective porosity ratio is verified by comparing its analytical predictions with measured data of clay soils at other locations in the area.The calculation formulas and methods presented in the paper can be used for reference in other areas.关键词
渗透系数/黏性土/有效孔隙比/廊坊沉降区/经验公式Key words
coefficient of permeability/clay soil/effective porosity ratio/Langfang subsidence area/empirical equation分类
天文与地球科学引用本文复制引用
齐剑峰,李晨,吴锋波,郭海朋,王云龙..廊坊地面沉降区黏性土渗透系数计算[J].成都理工大学学报（自然科学版）,2024,51(6):1070-1080,11.基金项目
国家自然科学基金项目(U2344225) （U2344225）
中国地质调查局地质调查项目(DD20230439) （DD20230439）
河北沧州平原区地下水与地面沉降国家野外科学观测研究站开放基金项目(CGLOS-2024-02). （CGLOS-2024-02）
