Portable device for soil surface in situ vertical permeability experiment

Abstract

The invention discloses a portable device for soil surface in situ vertical permeability experiment. The device comprises a water supply unit and a measuring unit. The water supply unit comprises a water storage bucket, a lifting platform and a steady flow box; the storage bucket is in a Mariotte flash structure, and used to provide a constant head; the measuring unit comprises a measuring cylinder and pressure measuring lines; pressure measuring holes are arranged at the upper end of the measuring cylinder and below the water inlet of the measuring cylinder; a plurality of pressure measuring holes in spiral fan shape are distributed outside the measuring cylinder, and are internally provided with a Pitot tube plugs; a knife edge is arranged at the bottom of the measuring cylinder; the water inlet of the measuring cylinder is communicated with the water outlet at the bottom end of the steady flow box; and the Pitot tube plugs are communicated with the pressure measuring lines through PU tubes. The invention has experimental functions of fixed water head measurement and falling head measurement, can conduct layered determination on the permeability coefficient of the soil surface, effectively reduce the destruction of soil disturbance on the original structure and permeability characteristic, and is applicable to soil with different permeability characteristics, and convenient for carrying and operation, especially suitable for soil in situ permeability experiment in the field.

Description

technical field [0001] The invention relates to a measuring device for soil infiltration parameters, in particular to a portable soil surface layer in-situ vertical infiltration experiment device, which is especially suitable for field soil in-situ infiltration experiments. Background technique [0002] The permeability coefficient is one of the basic characteristic parameters of soil, and it is an indispensable key parameter for studying the movement of groundwater and the migration of solute in soil. The accuracy of the value of hydraulic conductivity directly determines the reliability of simulation prediction of groundwater flow field and solute migration. In order to avoid the interference of soil disturbance on the measurement of hydraulic conductivity, in-situ measurement of soil infiltration characteristics has become a key technology for studying soil hydrodynamic processes and solute migration laws. Therefore, it is necessary to continuously improve and update exis...

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Problems solved by technology

[0005] At present, most of the in-situ experiments on the soil surface use the precipitation head test device (Chen Lihong. The device for measuring the permeability coefficient by variable water head method, CN103344542A[P / OL]. 2013-10-09; Chen Liang, Wang Baotian, Huang Dewen, etc. A variable Water head segmental permeability coefficient measurement equipment and measurement method, CN103091229A[P / OL].2013-05-08), and fixed water head experimental device (Shen Yang, Yan Jun, Yang Xing, etc. Detachable constant water head permeability coefficient tester ,CN102128775A[P / OL].2011-07-20]) is mainly used in indoor experiments, although there are devices for both constant water head and precipitation head experiments, it is not suitable for in-situ observations in the field (Wang Luochun, Chen Fei, Chen Guanhan, etc. A device for measuring soil permeability coefficient, CN103411871A[P / OL].2013-11-27)

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