A test device and method for joint determination of soil-water characteristics and permeability curves

Abstract

The invention discloses a device and a method for combined measurement of soil-water characteristic and permeability curves. The device comprises a ring knife rest base, a ring knife rest is fixedly connected onto the ring knife rest base, a plurality of identical and vertically overlaid soil sample containing ring knives are arranged on the inner side of the ring knife rest, and a piece of measurement matrix suction filter paper is arranged between the ring knifes. The uppermost ring knife is a ring knife where a porous stone is embedded, a water supply system is arranged right above the ring knife where the porous stone is embedded, the water supply system comprises a mariotte bottle and a water supply measuring cylinder, and a ceramic plate with known permeability coefficient is arranged at the bottom part of the water supply measuring cylinder. The device is used in combined measurement of the whole soil-water characteristic curve and the permeability curve, a small amount of soil samples are taken only by the ring knife, the sampling is simple and convenient, the sample is convenient to protect and transport, besides, the disturbance caused by the fact that a probe is inserted into the soil sample in the traditional method is avoided, and the problems of easy interference with the measurement result and the large data discreteness, caused by the fact that a probe main body of the probe is arranged externally, are avoided.

Description

technical field [0001] The invention belongs to the technical field of soil-water characteristic testing of unsaturated soil, and relates to a test device and method for jointly measuring the soil-water characteristic curve and permeability curve of unsaturated soil. Background technique [0002] The soil above the groundwater level is in an unsaturated state, and its soil-water characteristics directly affect its engineering properties. Therefore, it is of great engineering significance to quickly and accurately measure the soil-water characteristic curve and permeability curve of unsaturated soil. [0003] The current test method for joint determination of unsaturated soil water characteristic curve (Soil water characteristic curve, SWCC) and permeability curve is the transient profile soil column test method. The method is to embed the whole section of soil column into a glass cylinder, give a stable water head at one end, insert a group of moisture meters and suction pr...

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Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a test device and test method for joint measurement of soil-water characteristics and permeability curves, which solves the problems of incomplete measurement curves, high data dispersion and difficulty in obtaining test soil samples in the prior art

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