Device for accurately and rapidly determining permeability coefficient of soil

Abstract

The invention discloses a device for accurately and rapidly determining the permeability coefficient of soil, and belongs to technical field of rock and soil analysis equipment. The device comprises a device rack and further comprises a water supply device, a rapid saturation device, a soil sample column, a support and a permeation flow testing device. The soil sample column is fixedly arranged on the support, the water supply device and the rapid saturation device are fixedly arranged above the soil sample column and connected with a cover plate at the upper end of the soil sample column, and the permeation flow testing device is arranged on one side of the support and connected with the lower end of the soil sample column through a testing water guide pipe. The device well solves the problems that soil saturation is not sufficient, and permeation flow reading errors are caused, the testing accuracy of the device is improved, flexible control over the hydraulic gradient is achieved, and the device is convenient to operate, high in precision, low in input cost and wide in application range.

Description

technical field [0001] The invention relates to a soil engineering test device, in particular to a device for accurately and quickly measuring soil permeability coefficient. Background technique [0002] The permeability coefficient, also known as the hydraulic conductivity coefficient, is expressed as the unit flow rate under the unit hydraulic gradient. It is the most effective and direct indicator to reflect the drainage capacity of porous media. It is widely used in the calculation of surface runoff coefficient and agricultural soil environment research. Therefore, how to measure the soil permeability coefficient accurately, quickly and conveniently is of great significance. [0003] The instruments for indoor determination of soil permeability coefficient are generally divided into two types: constant head infiltration meter and variable head infiltration meter. Most of their working principles are based on Darcy's law. The difference between different instruments lies ...

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Problems solved by technology

[0006] 1. The soil saturation process takes a lot of time, and it is generally difficult to fully saturate. During the test process, the air bubbles in the soil rise, and the soil is gradually saturated, resulting in a deviation in the volume of seepage water, which affects the accuracy and speed of the infiltration test;

[0007] 2. Most permeation devices use graduated cylinders to measure the volume of seepage water at the lower outlet of the device within a certain period of time. Due to factors such as reading errors and limited graduations of the graduated cylinder, the measurement of seepage water volume is inaccurate, which affects the calculation of the permeability coefficient;

[0008] 3. The overflow port of the permeation device is set single, that is, the water level difference and vertical distance between the two piezometric tubes are constant, the control of the hydraulic gradient is inflexible, and the practical application range is limited;

[0009] 4. Specialized permeameters are expensive, complicated to operate and time-consuming

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