Multi-purpose permeameter device capable of eliminating side wall streaming effect and use method of multi-purpose permeameter device

Abstract

The invention belongs to the technical field of geotechnical tests, and discloses a multi-purpose permeameter device capable of eliminating a side wall streaming effect and a use method of the multipurpose permeameter device. The device comprises a water inlet end cavity, a sample box body, a water outlet end cavity, a prime coat binder layer formed by coating a prime coat binder and a water swelling material rubber putty layer formed by coating a water swelling material rubber putty, and the prime coat binder uniformly coats the inner wall of the sample box body to form the prime coat binder layer; the water swelling material rubber putty uniformly coats the prime coat binder layer to form the water swelling material rubber putty layer, the number of sections of the sample box body is one section, two sections or multiple sections, and the water inlet end cavity, the sample box body and the water outlet end cavity are sequentially connected and assembled through flanges in the horizontal or vertical direction and are used for carrying out a horizontal or vertical penetration test, and permeable plates are arranged at the joints of the water inlet end cavity, the test sample box body and the water outlet end cavity.

Description

technical field [0001] The invention belongs to the technical field of geotechnical tests, and in particular relates to a multipurpose permeameter device and a use method for eliminating the side wall flow-around effect. Background technique [0002] When the pores in the soil are connected with each other, water-permeable channels can be formed. Although these channels are very irregular and often narrow, water can flow through the soil along these channels by gravity. The phenomenon of water flowing in soil pore channels is called water seepage; the property that soil can be permeated by water is called soil permeability or water permeability, which is one of the mechanical properties of soil. The parameter of permeability, the larger the permeability coefficient of the soil, the stronger the water permeability; otherwise, the weaker it is. [0003] With the wide application of filling materials in dam construction, the experimental research on the penetration stability a...

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Problems solved by technology

The size of the conventional permeation test device permeameter is small (the inner diameter of the equipment is 200mm and 300mm), and it cannot meet the requirement that the inner diameter of the permeation instrument is greater than 5% of the particle size d85 which accounts for 85% of the sample gradation. times, the equivalent gradation curve can only be used to scale down the particle size to meet the requirement that the particle size is less than 5 times. The resulting scaling effect causes differences from the actual situation, and the test results often cannot reflect the actual situation. situation; and due to the low strength and rigidity of the conventional permeameter, it is impossible to carry out the penetration test on the filling material under the action of high water head; and the vertical permeability test and the horizontal permeability test of the conventional permeameter adopt two different test devices, and the test results are consistent poor comparability

[0004]The side walls of conventional permeameters are steel plates, and the filling material cannot be well combined with the side walls of the instrument, and it is easy to form side wall channels. Porosity occurs in the wall, resulting in distortion of test results, therefore, it is necessary to deal with the side wall

The traditional side wall treatment usually uses flexible water-blocking materials such as vaseline and plasticine, which need to be reapplied for each test, and repeated operations increase the workload of the test. Moreover, when the pressurized water head is large, the flexible water-blocking material and the penetration A separation layer is formed between the inner walls of the instrument, resulting in distortion of test data

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