Permeability testing method and device providing osmotic pressure and confining pressure by means of shunting bucket

Abstract

The invention discloses a permeability testing method and device providing osmotic pressure and confining pressure by means of a shunting bucket. The permeability testing device comprises a rock osmotic pressure chamber, a rock-soil permeameter, an air pressure supply and control system and an air pressure-water pressure conversion system, wherein the air pressure supply and control system comprises an air compressor and an air compressor regulating valve; the air pressure-water pressure conversion system comprises a water-filled pressure bucket; a lower end of the pressure bucket is providedwith a pressure overwater shunting outlet and a pressure underwater shunting outlet of different heights respectively; a three-way valve is arranged on a pipeline of the pressure overwater shunting outlet; one water outlet of the three-way valve is connected with the rock-soil permeameter through a pipeline, and the other water outlet is connected with a pressure head of a rock osmotic pressure chamber through a pipeline; and the pressure underwater shunting outlet is connected with a pressure chamber wall of the rock osmotic pressure chamber. Through adoption of the permeability testing device, the permeability characteristics of rock and rock-soil samples can be tested simultaneously, and the confining pressure and the osmotic pressure can be measured with the same set of instruments andequipment. The permeability testing device has the advantages of simple structure, convenience in operation and high measurement accuracy.

Description

technical field [0001] The invention relates to a rock soil rock permeability test device, in particular to a permeability test method and device for providing osmotic pressure and confining pressure by using a diverter barrel, and belongs to the technical field of test and test. Background technique [0002] The objects of underground engineering problems are rock-soil (rock) bodies, water and engineering structures, and the normal use of underground space caused by the influence of the permeability characteristics of rock-soil (rock) bodies and engineering structures varies greatly. In the process of preventing such problems, permeability testing is the most commonly used test method, and its test results are used to evaluate the permeability characteristics and variation rules of soil units, and provide accurate and reliable permeability indicators for engineering design and construction. [0003] The permeability test mainly uses rock soil and rock permeameters to measur...

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Problems solved by technology

[0003] The permeability test mainly uses rock soil and rock permeameters to measure the permeability characteristics of surrounding rock or surrounding soil; however, in the past, the osmotic pressure and confining pressure of rock soil and rock permeability measurement devices required two sets of systems to provide, not only structural redundancy , takes up a lot of space, is inconvenient to operate, and increases the cost of the instrument

[0004] In addition, most of the previous permeability test devices can only measure the permeability of one medium, such as rock and soil or only the permeability of rock; while some permeability test devices can complete the permeability test of two media , but the test device is expensive, and geotechnical and rock measurements share the same sample pressure chamber, which cannot fully take into account the geotechnical and rock permeability tests, the sample measurement environment is not very specific, and the test results have large deviations

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