Temperature-stress integrated control flexible wall penetration test method under dry-wet cycle

Abstract

The invention provides a temperature-stress integrated control flexible wall penetration test method under a dry-wet cycle, and relates to the field of geotechnical tests of geotechnical engineering. The test method comprises the steps of dryness and humidity circulation, axial pressure application, bubble removal, penetration test and the like, and a series of penetration tests of different dry and wet circulation times, different test temperatures, different consolidation pressures, different injection air pressures, different injection confining pressures and the like can be carried out on different samples; and a large amount of data about pressure-deformation-permeation of the soil body is obtained, so that the determination of the permeability coefficient under a plurality of influence factors is realized, the defects of the existing flexible wall permeability test are overcome, and more manpower and time are saved.

Description

technical field [0001] The invention relates to the field of geotechnical engineering geotechnical tests, in particular to a flexible wall penetration test method under dry-wet cycle temperature-stress integrated control. Background technique [0002] Entering the 21st century, my country continues to promote the construction of engineering projects to promote the steady development of the economy and society, but some engineering geological problems are often encountered during the construction process. Among them, the permeability coefficient is a quantitative index representing the permeability of soil, and it is also a basic parameter that must be measured in engineering applications. At the same time, under realistic conditions, external factors such as dry-wet cycle, temperature change, and stress change caused by humidity changes will have different effects on the permeability of rock and soil. The permeability coefficient under the change and the real simulation of ...

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Problems solved by technology

[0007] 1. The existing method uses the rigid wall penetration method to measure the permeability coefficient of the material after the dry-wet cycle, but does not consider the phenomenon of side leakage due to the dry-wet deformation of the sample, the dry-wet cycle of the sample under the action of the external environment, the temperature , the joint effect of stress, and when the penetrating liquid is heavy metal liquid, organic pollution liquid, strong acid and strong alkali, the measurement error of the permeability coefficient caused by the corrosion of the penetrating liquid to the instrument;

[0008] 2. The existing method uses the consolidated rigid wall penetration method to measure the permeability coefficient of the material under the action of stress after the dry-wet cycle, but does not consider the phenomenon of side leakage due to the dry-wet deformation of the sample. The test under the action of the external environment The combination of dry and wet cycles, temperature, and stress, and when the penetrating liquid is heavy metal liquid, organic polluted liquid, strong acid and strong alkali, the measurement error of the permeability coefficient caused by the corrosion of the penetrating liquid to the instrument;

[0009] 3. The existing method uses the flexible wall infiltration method to measure the permeability coefficient of the material after the dry-wet cycle, but it does not consider the combined effect of the dry-wet cycle, temperature, and stress of the sample under the external environment, and when the penetrant is a heavy metal liquid. , organic polluted liquid, strong acid and strong alkali, the permeation liquid will cause the measurement error of the permeability coefficient due to corrosion of the instrument. This control method does not realize automatic monitoring, and the realization process is complicated

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