Sample preparation equipment dedicated to triaxial test and capable of preparing high-density disturbed soil sample

Abstract

The invention discloses sample preparation equipment dedicated to a triaxial test and capable of preparing a high-density disturbed soil sample. The equipment comprises an electric hydraulic jack, a top plate, a middle plate, a bottom plate, supporting rod strings and a pile casing, wherein the electric hydraulic jack is equipped with an extension piston rod; scales are formed in the piston rod; a pressing disc is connected with one end of the piston rod; under the control of an electronic switch, the electric hydraulic jack drives the piston rod and the pressing disc to precisely compact a soil body to a corresponding position in the pile casing; after sample pressing is finished, the pile casing is inverted on the middle plate, and the obtained soil sample is pushed out by the electric hydraulic jack. Through adoption of the equipment, the extremely common defects that the compactness can hardly be controlled precisely, the equipment is deformed, and the prepared soil sample can hardly be taken out when the conventional sample preparation method is adopted, especially when the prepared soil sample is a high-density soil sample, are overcome; the equipment is simple to operate, and has the advantages that the workload of remolded sample preparation is reduced, the impact of a human factor on a test sample is mitigated, the precision and the efficiency of sample preparation are improved, and the problems existing in the disturbed soil sample preparation process are solved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering geotechnical tests, and specifically relates to a special sample preparation device for triaxial tests that can prepare high-density disturbed soil samples, and is suitable for most types of soils, especially high-density soils such as expansive soil and mudstone. Reinvented triaxial sample production. Background technique [0002] Before the triaxial test, it is generally necessary to carry out necessary processing and preparation of the soil sample according to the test procedure. For disturbed soil, there are three methods for preparing disturbed soil samples in the Geotechnical Test Regulations SL237-1999: Striking method, compaction method and compression method. Due to the repeated action of impact loads in the compaction process, the uniformity of the soil samples, the structure of the soil and other related physical and mechanical properties will inevitably be affected to...

AI Technical Summary

Problems solved by technology

Due to the repeated action of impact loads in the compaction process, the uniformity of the soil samples made by the punching method and the compaction method, the structure of the soil and other related physical and mechanical properties will inevitably be affected to a certain extent. When making high-density soil samples The above problems are more obvious, and there is a problem that it is difficult to compact to the specified density

Moreover, these two methods are cumbersome to operate, consume a lot of soil samples, require high experience and technology for operators, and inevitably have a certain impact on the sample due to artificial pressure unevenness

The compaction method is a method for disturbing soil samples. However, due to the lack of corresponding production equipment for a long time, especially when preparing high-density soil samples, it is very easy to accurately control the degree of compaction, instrument deformation and prepared soil samples. Difficult to remove, etc., so this method is not widely used

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