Integral permeability testing machine for self circulation measuring for perpendicular and horizontal permeability coefficient

Abstract

The invention discloses a comprehensive permeability testing machine for measuring vertical permeability coefficient and horizontal permeability coefficient. The invention comprises a constant-pressure water tank which is communicated with two water supply pipes, wherein, one water supply pipe is communicated with an upper pressure chamber; the top of the upper pressure chamber is provided with abarometer and an air-bleed hole and the side face of the upper pressure chamber is provided with an inflating device; the upper pressure chamber is communicated with a lower pressure chamber through an assembly member; the upper part of the lower pressure chamber is provided with a bubble exhaust hole and the lower part of the lower pressure chamber is communicated with a graduated flask through an exhaust pipe and a metered valve; the other water supply pipe is connected to the left of the assembly member; and the assembly member is communicated with the graduated flask through the exhaust pipe and the metered valve and consists of an impervious membrane, silicon rubber, a V-shaped slot board and a pressurized plastic membrane. The comprehensive permeability testing machine has the advantages that: firstly, the pressurized plastic membrane can quickly, precisely and uniformly transfer normal pressure to a sample, and the impervious membrane can prevent leakage of the sidewall; secondly, water flow is uniformly infiltrated into the V-shaped slot; thirdly, due to arrangement of the silicon rubber, the border effect is reduced; fourthly, the whole machine realizes measurement of thevertical permeability coefficient and the horizontal permeability coefficient, and is precise, simple and clean, highly efficient, practical and convenient to operate.

Description

technical field [0001] The invention relates to a comprehensive permeameter for self-circulating measurement of vertical and horizontal permeability coefficients, belonging to the technical field of measuring instruments. Background technique [0002] As an important reference performance index of permeability performance, permeability coefficient includes horizontal permeability coefficient and vertical permeability coefficient. At present, due to the strong tensile strength of geotextiles, it can effectively prevent seepage deformation in seepage and seepage overflow areas, and the permeability coefficient can be well controlled, so it has been widely used as reverse filter materials and water-proof materials in different projects. application. However, in specific engineering applications, needle-punched non-woven geotextiles need to withstand the pressure of the overlying rock and soil, and their thickness will change greatly, as will the pore diameter and permeability ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the above-mentioned gaps and defects, solve the problem that the normal pressure cannot be applied accurately, quickly and uniformly when measuring the horizontal permeability coefficient, and solve the problem of side wall leakage and slow saturation of the sample when measuring the vertical permeability coefficient. To solve the problem, provide an accurate, efficient, practical and simple comprehensive permeameter for self-circulation measurement of vertical and horizontal permeability coefficients

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