HU Kai,CHEN Xiaoqing.Laboratory Investigation of Hydraulic Parameter of Wide-Grading Gravelly Soil by Using Instantaneous Profile Method[J].Research of Soil and Water Conservation,2019,26(04):343-348.
利用瞬态剖面法测定宽级配砾石土水力参数试验研究
- Title:
- Laboratory Investigation of Hydraulic Parameter of Wide-Grading Gravelly Soil by Using Instantaneous Profile Method
- Keywords:
- wide-grading gravelly soil; time domain reflectometry; instantaneous profile method; soil-water characteristics curve; permeability coefficient function
- 分类号:
- TU411.4
- 摘要:
- 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×30 cm×30 cm（长×宽×高）正方体和30 cm×60 cm（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。
- Abstract:
- The 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.
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备注/Memo
收稿日期:2018-08-29;改回日期:2018-09-23。
基金项目:中科院STS重点项目（KFJ-STS-ZDTP-015）；国家自然科学基金（4161101144）
作者简介:胡凯(1988-),男,江西新余人,博士研究生,研究方向为地质灾害防治与机理。E-mail:khu15@imde.ac.cn
通讯作者:陈晓清(1974-),男,四川遂宁人,博士,研究员,主要从事地质灾害防治与机理研究。E-mail:xqchen@imde.an.cn