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[1]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.

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Laboratory Investigation of Hydraulic Parameter of Wide-Grading Gravelly Soil by Using Instantaneous Profile Method

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 04 Page number: 343-348 Column: Public date: 2019-06-11

Title:: Laboratory Investigation of Hydraulic Parameter of Wide-Grading Gravelly Soil by Using Instantaneous Profile Method

Author(s):: HU Kai^1,2, CHEN Xiaoqing¹; 1. Key Laboratory of Mountain Hazards and Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Keywords:: wide-grading gravelly soil; time domain reflectometry; instantaneous profile method; soil-water characteristics curve; permeability coefficient function

CLC:: TU411.4

DOI:: -

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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