Permeation coefficient tester for irregular sample under different hydraulic pressure conditions and test method

Abstract

The invention discloses a permeation coefficient tester for an irregular sample under different hydraulic pressure conditions and a test method. The tester comprises a testbed, a sample fixing deviceand an electronic control system, wherein a water inlet pipe is connected with a filter device; an energy accumulator is arranged between a water outlet of an electric pump and a pipe of a water inletof a water storage container arranged in the middle of the testbed; a water collection container is arranged on the inner side of the testbed; the sample fixing device is of a double-layer structureformed by a round steel barrel on the outer side and a hollow rubber seal kit on the inner side; the electronic control system comprises solenoid valves, a flowmeter, electronic switches of the electric pump, the energy accumulator and the inflator pump as well as a control center, the solenoid valves are arranged on a water outlet pipe of the electric pump, an energy accumulator pipe, an inflatorpump pipe and a lower pipe of the water collection container, and the flowmeter is arranged in the water collection container. The tester can test the permeation coefficients of the irregular sampleunder the different hydraulic pressure conditions, the sample sealing performance is good, test precision is reliable, and automation degree is high.

Description

technical field [0001] The invention belongs to the technical field of instrument detection, and in particular relates to a water permeability coefficient tester for irregular samples under different water pressure conditions, and also relates to a test method thereof. Background technique [0002] In mining projects, such as coal mining, due to the large mining depth, the hazards of groundwater are often encountered. After coal mining, the bottom plate is often subjected to high pressure groundwater. If the anti-seepage capacity of the bottom plate is insufficient, groundwater will pass through the bottom plate Huge water inrush accidents often occur. In addition, in the excavation of deep underground caverns in the fields of hydropower, transportation, etc., water inrush under various water pressure conditions is often encountered. Therefore, studying the permeability coefficient of field samples under different water pressure conditions is the key to prevent water inrush...

AI Technical Summary

Problems solved by technology

[0003] The water permeability coefficient is generally tested according to the building materials industry standard JCT945-2005 of the People's Republic of China, but the specification only stipulates the definition and detection principle of the water permeability coefficient, and there is no uniform regulation on the specific operation details, so each person in this industry has his own set The test method is usually to use an extremely simple permeable device for testing, not a fully automatic device, which will affect the accuracy of the permeability coefficient

In addition, the existing equipment does not consider the test method of the permeability coefficient under different water pressure conditions. Combined with the field conditions of deep groundwater, it is very important to study the hydraulic permeability coefficient under different hydraulic pressure conditions; in addition, the existing hydraulic permeability test equipment, For example, the concrete penetration test equipment mainly uses standard samples, which are suitable for materials that are easy to process such as concrete, but the rocks on site are generally irregular samples, and it is time-consuming to make irregular rocks into standard samples like concrete. It is laborious and difficult to operate; the traditional sealing method usually uses paraffin or polypropylene glue to apply to the sample. This sealing method not only easily causes uneven surface of the sample, but also causes water to flow easily from the sample Leakage around affects the accuracy of the test results, and the operation process is cumbersome, it is not easy to clean up after the test, and it is easy to cause damage to the test equipment

[0004] In summary, it can be seen that the traditional water permeability testing instruments can no longer meet the current technical needs.

Therefore, considering the problems of different water pressures, irregular samples and poor sealing methods, a water permeability test method for irregular samples under different water pressure conditions with convenient operation, high precision of test results and high degree of automation has been developed. Instruments are very necessary

Images