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Alternative TitleLaboratory Investigation of Hydraulic Parameter of Wide-Grading Gravelly Soil by Using Instantaneous Profile Method
胡凯1,2; 陈晓清1
Source Publication水土保持研究
Contribution Rank1
Abstract土水特征曲线和渗透函数是土体渗流分析和稳定性研究的重要参数。基于瞬态剖面法原理,加工制作30 cm*30cm*30cm(长*宽*高)正方体和30cm*60cm(直径*高)的渗透柱,针对宽级配砾石土进行时域反射法标定试验和渗透柱试验。此渗透柱装置可以同时测定不同断面基质吸力和体积含水率变化,试验经进水饱和与排水蒸发阶段,得到宽级配砾石土体积含水率与基质吸力的关系,并根据瞬态剖面法得到非饱和渗透系数随基质吸力的变化关系;同时,采用van Genuchten和Brooks-Corey土水特征曲线模型和渗透系数函数对其进行分析。结果表明:该渗透柱适用于宽级配砾石土水力参数测定;van Genuchten和Brooks-Corey土水特征曲线模型都能很好地描述宽级配砾石土土水特征曲线;Brooks-Corey渗透系数函数在描述宽级配砾石土渗透系数与基质吸力关系要优于van Genuchten渗透系数函数。这种试验方法为宽级配砾石土水力参数的测定提供了参考。
Other AbstractThe soil-water characteristic curve and permeability function are important parameters for soil seepage and stability analysis.In order to investigate the hydraulic parameters of wide-grading gravelly soil, a 30 cm*30 cm*30 cm (length*width*height)cube and 30 cm*60 cm (diameter*height)infiltration column was fabricated for the calibration test and infiltration column test of wide-grading gravelly soil.The infiltration column apparatus allows the measurement of both volumetric water content and matric suction at various levels.The infiltration column test was divided into three stages:saturation,drainage,and evaporation. And consequently,the relationship between volumetric water content and matric suction of wide-grading gravelly soil was obtained.Meanwhile,the instantaneous profile method was generally applied to determine the relationship between unsaturated permeability and matric suction.Moreover,the van Genuchten and Brooks-Corey equations and permeability functions were used to fit the test results.The infiltration column apparatus had been proved to be suitable for the determination of soil-water characteristics curves of wide-grading gravelly soil.The van Genuchten and Brooks-Corey model can accurately describe the soil-water characteristics curves.The Brooks-Corey permeability coefficient function was superior to the van Genuchten permeability coefficient function in terms of describing the relationship between the permeability coefficient and matric suction of wide-grading gravelly soil.This research will provide the method for measuring hydraulic parameters of wide-grading gravelly soil.
Keyword宽级配砾石土 时域反射法 瞬态剖面法 土水特征曲线 渗透系数函数
Indexed ByCSCD
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Document Type期刊论文
Corresponding Author陈晓清
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
胡凯,陈晓清. 利用瞬态剖面法测定宽级配砾石土水力参数试验研究[J]. 水土保持研究,2019,26(4):343-348.
APA 胡凯,&陈晓清.(2019).利用瞬态剖面法测定宽级配砾石土水力参数试验研究.水土保持研究,26(4),343-348.
MLA 胡凯,et al."利用瞬态剖面法测定宽级配砾石土水力参数试验研究".水土保持研究 26.4(2019):343-348.
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