Device for measuring soil-water characteristic curve of unsaturated soil without lateral confinement conditions by using dialysis method

Abstract

The invention provides a device for measuring a soil-water characteristic curve of unsaturated soil without lateral confinement conditions by using a dialysis method. The device comprises an inner steel ring, an outer steel ring, a porous stone, a semi-permeable membrane, rubber rings and a latex film, wherein the inner steel ring is connected with the outer steel ring through a bolt; the porous stone is arranged at the center of the outer steel ring; the three rubber rings are arranged between the inner steel ring and the outer steel ring for sealing; the two ends of the latex film provided with a test sample respectively penetrate through the central circular holes of the two inner steel rings and are oppositely sleeved outside the inner steel rings; the two ends of the latex film are fixed by the outer rubber ring of the inner steel rings; the semi-permeable membrane is arranged between the inner steel ring and the outer steel ring; the inner steel ring and the outer steel ring are tightly clamped by using a bolt. The device provided by the invention can be used for carrying out measurement of relationship between the moisture content and a suction force without lateral confinement conditions on a non-uniform unsaturated soil specimen with a large size by using the dialysis method, so as to overcome the defects that the existing method only can be used for measuring the smaller specimen. The device can be used for measuring the soil-water characteristic curve of the unsaturated soil and provides parameters of the unsaturated soil in related fields, such as geological engineering and geotechnical engineering.

Description

technical field [0001] The invention belongs to the technical fields of geological engineering and geotechnical engineering, and in particular relates to a device for measuring unsaturated soil-water characteristic curves of unsaturated soil under unconfined conditions by dialysis. Background technique [0002] Soil-Water Characteristic Curve (SWCC for short) is an important tool in unsaturated soil mechanics to describe the influence of the unsaturated state of soil on its hydraulic and mechanical properties. Its position and The shape can reflect the characteristics of the pore structure in the soil (the size and distribution of the pores) and the water holding capacity of the soil; many research fields in unsaturated soil mechanics, such as strength theory, seepage theory, consolidation theory, and constitutive theory all involve Application to SWCC. At present, the most convenient and commonly used method for measuring the low suction value (less than 2MPa) of SWCC is t...

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Problems solved by technology

At present, the most convenient and commonly used method for measuring the low suction value (less than 2MPa) of SWCC is the dialysis method. However, in the past, the dialysis method used to measure the soil-water characteristic curve of unsaturated soil samples often directly wrapped the sample with a semi-permeable membrane. Put it into a predetermined concentration of polyethylene glycol (PEG) solution for suction balance to obtain the relationship between the moisture content of unsaturated soil and the suction, but due to the limitation of the size of the semi-permeable membrane, it is impossible to test the larger size test, so when When the uniformity of the unsaturated soil sample is poor, it is often impossible to obtain true and effective test results due to the difference in sampling positions

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