Geotechnical test air pressure consolidation permeameter and test monitoring method thereof

Abstract

Disclosed are a geotechnical test air pressure consolidation permeameter and a test monitoring method thereof. The air pressure consolidation permeameter includes an air pressure loading device, a combined consolidation permeation sample device and a test index measurement device. The air pressure loading device includes a fixing base (18), a pressure supply reserve tank (35), a piston jacking pipe (15), brackets (1), a horizontal counterforce cross bridge (5), and electronic air pressure sensors (17) arranged on the pressure supply reserve tank. The combined consolidation permeation sample device includes a supporting seat (14), a base (13), a tank sleeve (10), a soil sampler (9), lower permeable stone (12), upper permeable stone (25), an inner tank pressure cover (7), an upper pressure box (8), an external threaded drainage jacking pipe (23), and a pressure rod (36). A sample cabin (11) is between the upper permeable stone and the lower permeable stone. The base (13) is provided witha water inlet channel (24). The test index measurement device includes an electronic flowmeter (13), electronic displacement sensors (16), an electronic pore water pressure gauge (26) and a permeablewater head pipe (19). The geotechnical test air pressure consolidation permeameter and the test monitoring method thereof has the advantages of small test error and convenient and fast operation.

Description

technical field [0001] The invention relates to the technical field of soil test devices and test methods, in particular to a soil test air pressure consolidation permeameter and a test monitoring method thereof. Background technique [0002] Soil is the product of the natural differentiation of rocks on the surface of the earth's crust, and it is also an essential building material in engineering construction. As a loose accumulation, soil is composed of soil particles, soil air, and soil water three-phase system, which makes it have complex physical and mechanical properties. In the production and construction, people often obtain the engineering mechanical indexes of the required rock and soil through indoor geotechnical tests, and conduct research and evaluation on different types of soil to provide a basis for engineering construction. [0003] The soil consolidation test is to measure the compression characteristics of the soil under pressure. The e-lgp compression cu...

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Problems solved by technology

[0004] (1) Weight lever pressurization. During the consolidation test, the lever loses balance as the soil sample is compressed, resulting in a discrepancy between the actual pressurized load and the theoretical pressurized load. Although the WG-3 unidirectional compression consolidation instrument is designed There is a balance lever adjustment wheel, but the adjustment of the pressurized lever balance by this method is staged, and the pressurized load cannot be compensated in real time. When the balance of the pressurized balance bar is artificially observed, the consolidation process will inevitably occur during the balance adjustment process. Experiments make a difference

[0005] (2) The loading mandrel of the WG-3 unidirectional compression consolidation instrument is in contact with the upper gland of the consolidation instrument. The deformation of the sample during the consolidation process may be uneven, which will cause the upper gland of the consolidation instrument to The deflection of the permeable stone above the sample caused the jamming of the upper gland of the consolidation instrument and the jamming of the permeable stone and the ring knife above the sample, which affected the measurement of the test deformation by the displacement dial indicator

[0006] (3) The test measurement index is relatively simple, and the consolidation compression test can only control the consolidation load and measure the consolidation deformation

At present, in order to achieve the test purpose in the laboratory test, most of the experimenters combine the WG-3 unidirectional compression consolidation instrument and the permeation instrument to carry out transformation. After reviewing the relevant patents and test verification, it is found that there are some problems in the transformation of this type of equipment: in addition to the above In addition to the shortcomings of the WG-3 type unidirectional compression consolidation instrument and permeameter, there are also some problems in the commonly modified consolidation permeameter. Since the soil sampling ring knife is firmly pinched by the consolidated permeameter and cannot be moved, the pressure of the water head will push the sample upwards, causing the soil sample to separate from the ring knife, and water will pass through the gap, resulting in inaccurate measurement of the permeability coefficient.

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