Permeameter for realizing multi-field coupling and in-situ dry-wet cycle

Abstract

The invention discloses a permeameter for realizing multi-field coupling and in-situ dry-wet cycle, belonging to the technical field of rock and soil permeation equipment. The permeameter comprises anair compressor and a rack, wherein a movable cross beam is arranged on the rack; the permeameter is characterized by further comprising a pneumatic control cabinet, an axial pressure loading device,a pore pressure loading device, a confining pressure loading device, an in-situ drying device, a metering device and a pressure chamber; a programmable logic controller (PLC) is arranged in the pneumatic control cabinet; the in-situ drying device comprises a resistor heating wire and a temperature control instrument, wherein the resistor heating wire is electrically connected with the temperaturecontrol instrument; the metering device comprises a water collector, a weighing sensor and a mass display meter, and the weighing sensor is separately and electrically connected with the mass displaymeter and the PLC. The permeameter can realize multi-field coupling as well as in-situ drying and measurement of dryness and humidity of the sample, and guarantees the integrity of the sample structure during the test, thereby being capable of effectively reflecting the actual reaction situation and guaranteeing the accuracy of the sample permeation.

Description

technical field [0001] The invention relates to the technical field of rock-soil mass infiltration equipment, in particular to a permeameter for realizing multi-field coupling and in-situ dry-wet cycle. Background technique [0002] During the construction and operation of large-scale hydropower projects, reservoir storage and reservoir water level fluctuations will cause changes in the hydrological conditions and natural environment of the slopes on both banks. The periodic rise and fall of the reservoir water level will not only cause cyclical changes in the dry and wet state of rock and soil, but also cause periodic changes in the seepage field and stress field of the slopes on both banks. [0003] In the past, when testing the permeability of rock and soil, the existing methods only considered the dry-wet cycle caused by the rise and fall of the reservoir water level, and did not consider the joint action of the seepage field and the stress field. That is, the effects o...

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Problems solved by technology

[0005] The permeability test device disclosed in this patent document can compare the permeability coefficient before and after the dry-wet cycle of the sample, and obtain the influence of the number, frequency and time of the dry-wet cycle on the sample permeability coefficient, but it cannot realize multi-field coupling. Cannot effectively reflect the actual situation, affecting the accuracy of sample penetration

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