Triaxial-test sample preparation device and sample preparation method

Abstract

The invention discloses a triaxial-test sample preparation device. The triaxial-test sample preparation device comprises a buckling die and a removing die. The triaxial-test sample preparation device is characterized in that the section of a left petal die is of a semicircular structure; the upper end surface and the lower end surface of the left petal die are respectively provided with a necking petal die; the outer diameter of the necking petal die is smaller than that of the left petal die; a linear type flange is arranged on one edge of the butting plane of the left petal die along the axial direction, and a linear type groove is formed in the other edge of the butting plane of the left petal die. The structure of a right petal die is the same as that of the left petal die, and the right petal die and the left petal die are connected in a fastening manner. Tight hoop sleeves are arranged on upper-end necking petal dies of the left petal die and the right petal die; backing rings are arranged on the upper end surfaces of the left petal die and the right petal die, and the lower end of a top cover is inserted into central holes of the backing rings. A lower fastening component and an upper fastening component are completely same in structure and are symmetrically arranged at the lower ends of the left petal die and the right petal die. A step hole is formed in the demolding drum, and the outer diameter of a cushion block is the same as the minimum diameter of the step hole and the inner diameter of the left petal die. The triaxial-test sample preparation device disclosed by the invention has the advantage that the same pressure on the two ends of a soil sample and on the whole sample is realized so as to meet the requirement of density uniformity of the whole sample.

Description

technical field [0001] The invention belongs to the field of sample production, and in particular relates to a sample preparation device and method for conventional static triaxial geotechnical test sample preparation, dynamic triaxial test sample preparation and consolidation test one-time compaction sample preparation suitable for national standards and British standards. Background technique [0002] Static triaxial test, dynamic triaxial test and consolidation test are important test methods in the field of geotechnical engineering, and are the main means to measure the mechanical properties of various soils under different stress states. The parameters obtained by the test are the stability of engineering slopes, It is an important basis for the analysis of foundation bearing capacity and soil quality. Therefore, the quality of sample production largely affects the quality of test parameters, thereby affecting engineering safety. The quality of sample preparation by tr...

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Problems solved by technology

[0003] The present invention aims to overcome the difficulty in controlling the sample preparation quality of the existing layered sample preparation method for geotechnical tests, such as uneven compactness of the sample, severe layering of the sample, and inconsistencies in the degree of compaction at both ends of the sample by some sample preparation methods, etc. Improved sample preparation device and method for sample preparation defects

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