A magnesia-solidified soil carbonization process expansion and carbonized soil shear strength test device

Abstract

The invention discloses a test device for expansibility and shear strength of carbonized soil in the carbonization process of magnesia-solidified soil. Controllers are grouped in order. The temperature sensor is embedded in the center of the electrode plate to realize the simultaneous test of temperature and resistivity; the strain gauge is arranged in the balance plate and the double-layer shell of the shear box, and the strain gauge can work freely through the hydraulic rod and the reel; through the spring bolt and the flexible The connecting piece realizes the change of the inner diameter of the inner shell of the shear box and the accurate test of the expansion and shear strength of the sample. The shear box is placed in a sealed box, and the orderly operation and data collection of each device are realized through the controller, which avoids sample damage and stress release during the sampling and loading process of carbonized samples, and reduces the impact of the external environment on physical and mechanical parameters. The test data is of great significance to the application of carbonation solidification technology and the design of carbonized soil foundation.

Description

technical field [0001] The invention belongs to the category of civil engineering instruments and devices, in particular to a device for testing the expansibility of magnesia-solidified soil during carbonization and the shear strength of carbonized soil. Background technique [0002] With the development of my country's economy and urbanization, urban buildings, transportation and water conservancy and other infrastructure often encounter soft soil layers of different thicknesses, and the soft soil has the characteristics of high water content, large void ratio, low strength, high compressibility, etc. Construction and foundation preparation present enormous challenges. Among the commonly used foundation treatment methods, dynamic compaction method and vibro-construction method are rarely recommended due to the large amount of noise, and the traditional replacement method is prone to uneven distribution of bearing capacity due to the large amount of work and high cost. Pile ...

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Problems solved by technology

Although the above direct shear instrument has been greatly improved compared with the traditional direct shear instrument, and simulated the direct shear test of soil in different environments, it still cannot meet the expansibility of the soil during the carbonization process and the shear strength test of the carbonized soil. It is also impossible to complete the detection of the temperature and resistivity of the soil sample during the carbonization process.

[0005] Based on the rapid development of my country's engineering construction and the advantages of new carbonation reinforcement methods, combined with the current situation of difficult parameter testing in the carbonation reinforcement process and inaccurate carbonation soil mechanical parameters, it is urgent to develop a magnesia-solidified soil carbonization process. The soil shear strength test device is of great significance in the effective use of carbon dioxide, reasonable engineering design and application, etc.

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