Method and device for preparing silty soil triaxial-test test sample

Abstract

The invention discloses a method and a device for preparing a silty soil triaxial-test test sample. The method comprises the following steps: adding distilled water into silty soil and stirring to enable soil samples to be in a flow plastic state, namely slurry; precipitating the slurry in a split round die under the action of self weight; applying dead loads to the upper part of the test sample, removing the dead loads at the upper part of the test sample and enabling the test sample to be further solidified by adopting a vacuum negative pressure of minus 40 kPa, wherein in the process of applying the dead loads, to guarantee that the slurry does not overflow, the loads are slowly and gradually loaded and a next-stage load is applied after the soil samples complete solidification and drainage under a current load; and finally, removing the negative pressure and the split round die and completing preparation of the test sample, so that triaxial test equipment can be assembled to carry out static triaxial or dynamic triaxial test. The method and the device are simple to operate; the technical method is easy to master; equipment required for preparing the test sample is very simple; required test sample preparation cost is low; uniformity inside the soil samples is very good; reproduction degree between the soil samples is high; a microstructure of a soil layer in the nature can be reproduced to a higher degree; the soil samples do not need to be cut; disturbance is reduced; and the test result has high credibility.

Description

technical field [0001] The invention relates to a mud preparation method for samples used in triaxial tests (static triaxial and dynamic triaxial), and is mainly suitable for silt. Background technique [0002] Silt is widely distributed in my country, among which loess is typical, and the area of ​​loess accounts for 6.3% of the country's land area. In order to study the mechanics of silt, triaxial test is a common technique. Usually, the compaction method can be used to prepare the disturbed sand sample, while the clay sample can be easily realized by using the undisturbed soil due to its viscosity. As a kind of soil between sandy soil and clay, if the sample is simply prepared according to the method of sandy soil or clay, the microstructure of the sample will be greatly different from the actual situation on site, resulting in a large degree of variation in the test results. different from the actual situation on site. Silt has certain viscosity, but the cohesive forc...

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Problems solved by technology

As a kind of soil between sandy soil and clay, if the sample is simply prepared according to the method of sandy soil or clay, the microstructure of the sample will be greatly different from the actual situation on site, resulting in a large degree of variation in the test results. Different from the actual situation on site

Silt has a certain degree of viscosity, but the cohesive force is not high enough to resist the damage during the preparation of undisturbed soil samples, which makes the preparation of silt samples difficult and hinders the study of silt

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