Testing device for measuring expansive force of soil sample in real time

Abstract

The invention discloses a testing device for measuring expansive force of a soil sample in real time and belongs to the technical field of geotechnical engineering measuring instrument manufacturing. The testing device comprises a consolidation apparatus adopting a toughened glass water tank, wherein a retaining ring is arranged on the outer side of an annular hoop arranged on permeable stones; the inner side of the annular hoop is directly and tightly contacted with a cutting ring with the soil sample; thin filter paper is arranged on the upper surface and the lower surface of the soil sample; the permeable stones and a pressurizing cover are placed at the top of the soil sample; the upper part of a rubber cap is tightly contacted with the cutting ring; the lower part of the rubber cap is tightly contacted with the outer side of the consolidation apparatus water tank; a water tank put beside the consolidation apparatus is positioned on an iron stand; the water tank is connected with a water inlet hole of the rubber cap; a vertical force transfer rod with threads is arranged at the middle part of a steel frame cross beam arranged on the outer side of the consolidation apparatus and is contacted with the pressurizing cover; and the consolidation apparatus and the iron stand are respectively arranged on a balance. The expansive force of the soil sample can be measured in real time, an expansive force travel-time curve of the soil sample can be obtained and the vertical deformation of the soil sample can be controlled, so that the volume of the soil sample can be unchanged. The testing device has the advantages of simple and reasonable structure, high testing precision, convenience for operation and easiness for control.

Description

Technical field [0001] The invention relates to a geotechnical test measuring device, in particular to a test device for real-time measuring the hydraulic properties of soil samples, and belongs to the technical field of geotechnical engineering measuring instrument manufacturing. Background technique [0002] Unsaturated bentonite, expansive soil, etc. are widely used in engineering fields such as roadbeds, foundations, retaining walls, landfills, nuclear waste deep geological repositories, etc. At the same time, its engineering quality and safety have caused domestic and foreign geotechnical Concerned by engineering researchers. These expansive soils will undergo corresponding changes in their physical properties after rainfall infiltration, especially the expansive force will change as the moisture content of the soil increases. Expansion force refers to the force generated by increasing the water content while keeping the volume of the soil sample unchanged. Because the soi...

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Problems solved by technology

However, the expansion force obtained by the above methods is often related to human control factors, and the human error caused by loading has a great influence on the accuracy and precision of the test, and during the test, the recorded data cannot reflect the expansion force due to the test. The law of sample inlet water changing with time

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