Unsaturated soil permeability coefficient measurement device

Abstract

The invention discloses an unsaturated soil permeability coefficient measurement device, and relates to the technical field of soil body permeability coefficient measurement. The device comprises a columnar straight pipe, a plurality of moisture sensors, a plurality of tensiometers, a soil column axial deformation measurement device, and a wetting front displacement measurement device, wherein thecolumnar straight pipe is used for containing a soil sample to be measured, and the upper end of the columnar straight pipe is provided with a loading device for applying axial pressure to the soil sample to be measured; the plurality of moisture sensors and the plurality of tensiometers are evenly arranged on the columnar straight pipe in sequence from top to bottom, water quantity changes in awater supply device and a water storage device are measured through a gravity measurement device; the soil column axial deformation measurement device measures the axial deformation quantity of the soil sample to be measured; and the wetting front displacement measurement device measures wetting front advancing displacement in the soil sample to be measured. By use of the device, the soil column axial deformation can be recorded, the change of soil column axial displacement is monitored to predict the deformation rule of the soil body under different axial force functions, so that a transientprofile method can be used, a wetting front advancing method can be used for measuring a soil body permeability coefficient, and two methods can be simultaneously utilized to accurately measure the unsaturated permeability coefficient functions of various soil bodies.

Description

technical field [0001] The invention relates to the technical field of soil sample permeability coefficient measurement, in particular to a measuring device capable of accurately measuring the permeability coefficient of unsaturated soil under hydraulic-mechanical coupling. Background technique [0002] The hydraulic-mechanical coupling characteristic is the most important characteristic that distinguishes unsaturated soil from saturated soil. Therefore, it is impossible to truly reflect the influence of soil deformation on the soil-water characteristic curve by considering the mechanical and hydraulic properties of unsaturated soil in isolation. Reproduces the seepage behavior of unsaturated soils. The traditional one-dimensional soil column seepage device does not consider the influence of water and force on the soil permeability coefficient at the same time, and cannot measure the axial displacement of the soil column. The sensor spacing is relatively large. For soil with...

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Problems solved by technology

[0002] The hydraulic-mechanical coupling characteristic is the most important characteristic that distinguishes unsaturated soil from saturated soil. Therefore, it is impossible to truly reflect the influence of soil deformation on the soil-water characteristic curve by considering the mechanical and hydraulic properties of unsaturated soil in isolation. Reproduce seepage behavior of unsaturated soils

The traditional one-dimensional soil column seepage device does not consider the influence of water and force on the soil permeability coefficient at the same time, and cannot measure the axial displacement of the soil column. The sensor spacing is relatively large. For soil with a large permeability coefficient, It is impossible to accurately measure the soil permeability coefficient function under the coupling of water and force, and there is no real response to the deformation law of the soil under the simultaneous action of water and force. The applicable method is relatively simple, and the applicability needs to be improved.

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