Sand core acceleration water discharging method of gravelly soil large-scale three-shaft test and sample pore-forming maker

Abstract

The present invention discloses a sand core acceleration water discharging method of gravelly soil large-scale three-shaft test and a sample pore-forming maker, and belongs to the technical field of Rock and Soil Mechanics three-shaft test. According to the method, a cylindrical standard sample which has a diameter of 30cm is provided with a plurality of vertical through holes which axially penetrate the sample; the sample with through holes is placed on a flat panel, the standard sand is poured into from the upper openings of the through holes; the standard sand is pounded so that the samplewith openings becomes the sample with sand cores, and the sample with sand cores are used for executing large-scale three-shaft test of gravelly soil for quickly and accurately calculating the shearing resistance and stress-strain relationship of the sample. The method of the invention in which pre-pore-forming is executed along the axial direction of the sample in the large-scale gravelly soil sample and sand cores are formed in the holes through sand filling can effectively increase the saturation and discharging speed of the sample. The test shows that the large-scale three-shaft sample pore-forming maker has the advantages of convenient operation and high pore-forming quality and totally satisfies the test requirement of large-scale three-shaft sample.

Description

technical field [0001] The invention belongs to the technical field of triaxial tests of rock and soil mechanics, and in particular relates to a new test method for accelerated drainage of sand cores in large-scale triaxial tests of gravel soil and a sample hole-forming sample preparation device thereof. Background technique [0002] In the prior art, the triaxial instrument is one of the most routine and important experimental equipment for rock and soil mechanics research. Triaxial test is a test to determine the shear strength and stress-strain relationship of rock and soil materials. The test method is to apply confining pressure (ie small principal pressure σ 3 ) and axial stress σ 1 , to measure the axial strain δ of the sample under different stress states 1 and bulk strain ε v , to the failure of the sample, the relationship between the shear strength and the stress-strain of the sample is obtained. [0003] More than 70% of the 200m-high earth-rock dams current...

AI Technical Summary

Problems solved by technology

Because there are a lot of coarse particles in the gravel soil, to accurately measure its strength and stress-strain characteristics, a large-scale triaxial test should be carried out. , the test of strength and stress-strain characteristics of gravel soil has become a difficult problem in rock and soil mechanics testing

Specimen saturation, consolidation, and insufficient drainage during shear can all lead to inauthentic triaxial test results for gravel soils

If the test is carried out according to the traditional method to ensure that the sample is saturated, consolidated, and fully drained during the shearing process, the test period will be very long, which is unacceptable in terms of the performance of the large-scale triaxial tester and the test time. Therefore, There is an urgent need to improve the triaxial test method of gravel soil, but there is no ready-made new test method and corresponding test equipment in the prior art

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