Method for regulating and controlling water pressure of seepage flow water outlet end

Abstract

The invention relates to a water pressure regulation method at seepage water outlet end, which comprises connecting a pipe filter with a sample seepage water outlet end, using a speed-regulating valve connected with the pipe filter to regulate the flux of the seepage water outlet end in 0-10L / min to keep stable seepage quantity at the water outlet end. When the water pressure at the seepage inlet end is stable and the sample seepage is balance with the regulation flux, the effusion end generates stable water pressure and forms stable water pressure difference at two ends of the sample. When the seepage water pressure difference and the flux are stable, the permeability test in the time section meets darcy law to obtain the sample permeability index at relative conditions. The invention has low cost, which resolves the high-pore water pressure and low hydraulic gradient simulation test of project to provide reliable water pressure regulation method at seepage water outlet end for sample permeability and mechanical property research.

Description

Technical field: [0001] The invention is mainly used for rock (body) permeability and its permeability mechanical property test and damage mechanism research under the conditions of high pore water pressure and small hydraulic gradient, and particularly relates to a water pressure regulation method of seepage outlet water end. Background technique: [0002] According to the experimental principle, indoor permeability test methods can be divided into two categories: one is to apply a certain or changing water pressure difference at both ends of the test piece, and calculate the permeability coefficient of the test piece by measuring the seepage flow rate. The variable water level method belongs to this category; the other is to inject water at a certain flow rate or directly apply a pressure pulse to one end of the specimen, and calculate the permeability coefficient of the specimen by measuring the pressure difference between the two ends of the specimen over time. There are...

AI Technical Summary

Problems solved by technology

This method is to test the permeability of rock samples according to the relationship between water pressure balance and time. It ignores the compressibility of the fluid in the rock sample and the pore compressibility of the rock (body), the deformation of the pipeline and the leakage of the pipeline. Moreover, the accuracy of the differential pressure sensor is relatively low, and the long test duration will inevitably affect the test results.

The water pressure at the seepage outlet is a variable, and the pore water pressure on the actual rock mass does not change with time, which is inconsistent with the actual pore water pressure on the rock sample. Testing of permeability and related mechanical properties of lower rock (body) under total stress and strain process

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