Triaxial sample preparation device and method by means of solidification method

Abstract

The invention relates to a triaxial sample preparation device and method by means of a solidification method. The device includes a cylindrical solidification cylinder, a cylindrical solidification cylinder baseplate and a solidification cylinder top cover, wherein the diameter of the cylindrical solidification cylinder baseplate is matched with the inner diameter of the solidification cylinder. The preparation device also includes padding blocks used for changing the relative positions of the solidification cylinder baseplate and solidification cylinder, a fixing rack and a stirring rod. Thelower end of the solidification cylinder is positioned in a solidification cylinder sleeve the inner diameter of which is matched with the outer diameter of the solidification cylinder, and the solidification cylinder baseplate is fixed to a base through a fixing rod penetrating through the solidification cylinder sleeve and the padding blocks. On the one hand, the relative positions of the solidification cylinder and solidification cylinder baseplate are controlled by increasing or decreasing the padding blocks on the fixing rod, the depth of the solidification cylinder is increased uniformly, and the differential amount of added sludge each time is decreased. On the other hand, the stirring rod is adopted for layering and thorough stirring step by step, the discharging distance of bubbles is shortened, the bubbles sealed in the sludge are reduced to a great extent, and therefore the uniformity and reliability of whole samples are improved.

Description

Technical field [0001] The invention relates to geotechnical testing equipment and methods, in particular to a triaxial sample preparation device and a preparation method for liquid cohesive soil. Background technique [0002] Soil is a heterogeneous, porous and multiphase discontinuous medium in nature. Due to the heterogeneity and complexity of the constituent materials, the physical and mechanical properties of soil are complex and changeable. Through the indoor triaxial test, the physical and mechanical parameters related to the soil can be obtained as an important basis for engineering design. In the triaxial test, the preparation of the sample is very important. For the same soil, when other conditions remain unchanged, the difference in sample uniformity will lead to different test results. In the prior art, when triaxial tests are performed on cohesive soils, the consolidation method is commonly used to prepare samples. Distilled water is added to the air-dried soil to p...

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Problems solved by technology

The disadvantage of this method is that it is easy to close the air bubbles during the preparation of the mud and pouring into the sample preparation cylinder, and the amount of mud poured in different times makes it difficult to control the uniformity of the entire sample

The invention patent application with the application publication number of CN107941586A in the prior art discloses a sample preparation method of a cylindrical soil sample for the tensile strength test of cohesive soil. The method of the invention is divided into three layers along the axial direction of the cylindrical soil sample in the mold Fill with cohesive soil, compact each layer after filling, and at the same time strengthen the strength of the end of the layer by inserting reinforcing ribs at the end of each layer of soil samples, so that the contact surface of the soil samples is parallel to the direction of the applied tension , although this invention adopts the method of filling cohesive soil in three layers and then compacting to prepare cylindrical soil samples, it cannot solve the defects in the preparation of samples for cohesive soil triaxial test by consolidation method

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