A Method for Measuring Permeability Coefficient of Plastic Cut-off Wall

Abstract

The invention relates to a determination method for the osmotic coefficient of a plastic cut-off wall. The international patent classification (IPC) of the invention is E02D1 / 04 and E02D33 / 00. According to the determination method in the invention, a special determination apparatus is used, and the special determination apparatus comprises a top cover, a sample holder, a pedestal, an automatic pressurization system, a water inlet end volume changing pipe and a water drainage volume changing pipe, wherein the top cover is provided with an upper air outlet communicating with the sample holder and a water outlet, and the pedestal is provided with a water inlet and a lower air outlet. The determination method provided by the invention is applicable to determination of low osmotic coefficients of a variety of novel material cut-off walls. The space in the sample holder used in the determination method is in the shape of a circular truncated cone, with a bottom diameter 2 to 3 mm greater than a top diameter, so a test piece is prevented from being moved under impact of hydraulic pressure in the case that the hydraulic pressure is great, and seepage of a contact surface of the holder and the test piece is avoided.

Description

Technical field: [0001] The invention relates to a method for measuring hydraulic engineering structures, in particular to a method for measuring the permeability coefficient of plastic cut-off walls, the IPC international patent classification numbers of which are E02D1 / 04 and E02D33 / 00. Background technique: [0002] Plastic anti-seepage wall refers to the use of drilling and grooving machinery to solidify the wall with mud in the loose permeable foundation or dam (weir) body, excavate groove-shaped holes or interlocking pile holes, and pour underwater concrete in the groove (hole) Or backfill other anti-seepage materials to form an underground continuous wall with anti-seepage function. It is one of the engineering measures to prevent seepage, ensure foundation seepage stability and dam seepage safety. At present, the types of plastic cut-off walls mainly include the following categories: 1. Traditional plastic concrete cut-off walls; 2. Cement-soil cut-off walls; 3. Pol...

AI Technical Summary

Problems solved by technology

At present, with the development of water conservancy projects, the research on anti-seepage wall materials has developed rapidly, and a variety of materials suitable for anti-seepage wall engineering have emerged. The permeability coefficients of new materials for anti-seepage walls are all small. Previously, concrete The method and device for testing the seepage coefficient of the cutoff wall are only suitable for the cutoff wall with a large permeability coefficient, and the test method and device for the permeability of the cutoff wall are less than 10. -6 The new plastic cut-off wall of m / s cannot be tested accurately, so it is particularly necessary to develop a device and method suitable for measuring the permeability coefficient of the cut-off wall engineering with low permeability coefficient

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