Rapid test instrument and method for obtaining characteristic water holding curve of soil with strong structure through transient state method

Abstract

The invention discloses a rapid test instrument and a method for obtaining the characteristic water holding curve of soil with a strong structure through a transient state method. The test instrumentcomprises a base made of organic glass. A soil sample container for storing a soil sample is arranged on the base. Between the base and the soil sample container, a volumetric water content testing device and a matrix suction testing device are arranged. The volumetric water content testing device is connected to an electromagnetic wave emitter through a coaxial cable. The matrix suction testing device is connected to a pressure meter through a hard plastic pipe. The volumetric water content testing device and the matrix suction testing device are used to test the volumetric water content andthe matrix suction of a tested soil sample, and the volumetric water content and the matrix suction are associated to obtain the characteristic water holding curve of the soil sample. The structure ofthe rapid test instrument is simple; the soil structure is not destroyed, the process of calibrating the device for testing the volumetric water content is simple, the test is rapid, and the measurement precision is high. The test instrument and method are especially suitable for rapidly testing the characteristic water holding curve of structural soil.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering measuring instrument manufacturing, and in particular relates to a transient rapid test instrument and method for water-holding characteristic curve of strong structural soil. Background technique [0002] The presence of gas and liquid water in soil pores is called unsaturated soil. In the natural state, the soil is mostly in an unsaturated state, and the water content increases after the infiltration of rainwater, and the matrix suction decreases at the same time. Conversely, after drying and evaporation, the water content of the soil decreases and the matric suction increases. The water-holding characteristic curve of unsaturated soil defines the relationship between soil matric suction and water content, which reflects the water-holding capacity of the soil. The water holding characteristic curve is the basic soil property in unsaturated soil mechanics, and it is an importan...

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Problems solved by technology

However, most of the transient testing instruments currently used need to insert a large number of soil sensors for measurement (such as tensiometers and electromagnetic waveguide probes), which will damage the structure of the soil, and the test results cannot reflect the water holding characteristics of the original soil samples.

Therefore, the existing transient test instruments are not suitable for soils with strong structure, such as loess in the northwest region and structural soft soil in the southeast coast, etc.

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