Flexible wall permeameter for realizing temperature-stress integrated control under dry-wet cycle

Abstract

The invention provides a flexible wall permeameter for realizing temperature-stress integrated control under a dry-wet cycle, and belongs to the field of flexible wall permeameters. The flexible wall permeameter comprises a testing device, a pressurizing device, a permeation system, a confining pressure system and a sensor group. The permeation system and the confining pressure system comprise three injection chambers, the pressurizing devices comprise a top pressurizing device and a bottom pressurizing device, and the confining pressure on a sample can be formed by arranging the testing device. The permeameter can be used for carrying out permeation tests under various set temperatures, various axial stresses, various set liquid confining pressures and various set injection pressures at the same time after a dry-wet cycle is tested. According to the flexible wall permeameter, the determination of the permeability coefficient under different confining pressure states is realized, the functional defects of the existing flexible wall permeameter are overcome, and more manpower and time are saved.

Description

technical field [0001] The invention relates to the technical field of environmental geotechnical engineering, in particular to a flexible wall permeameter that realizes temperature-stress integrated control under dry-wet cycles. Background technique [0002] The rapid development of my country's modern society has brought about numerous infrastructure construction and urban geological problems. Among them, the permeability coefficient is a key index reflecting the permeability of rock and soil, and it is also a basic parameter that must be measured in engineering applications. [0003] In traditional indoor permeation tests, rigid wall permeameters and flexible wall permeameters are commonly used measurement methods. In the rigid wall permeability test, the sample is often not properly installed due to uneven sample preparation, so that it cannot be in close contact with the side wall, and side leakage occurs, so that the permeability coefficient of the soil cannot be accur...

AI Technical Summary

Problems solved by technology

[0009] 1. The existing technology is based on the blower and temperature-controlled lamps to realize the dry-wet cycle of the sample, 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 penetrating liquid is heavy metal liquid, organic pollution, etc. In the case of liquid, strong acid and strong alkali, the measurement error of the permeability coefficient caused by the corrosion of the permeate to the instrument;

[0010] 2. The existing technology realizes automatic monitoring based on single-chip microcomputer technology, but it also does not consider the combination of dry-wet cycle, temperature and stress of the sample under the external environment, nor does it consider that the seepage liquid is heavy metal liquid, organic pollution liquid, strong acid and strong alkali , the requirements for the pH, conductivity and other indicators of the end conditions of the penetration test;

[0011] 3. The existing technology controls the temperature based on the liquid heating rod, but it also does not consider the combined effect of the dry-wet cycle, temperature and stress of the sample under the external environment. This control method does not realize automatic monitoring, and the realization process is complicated

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