A measurement system and method for variable water head permeability coefficient

Abstract

A measurement system and method for a falling head permeability coefficient, relating to the technical field of rock seepage experiments, solving the technical problem of long time consumed by a permeability test, eliminating the impact of temperature and pressure changes on permeability coefficient measurement. The system comprises a liquid storage system (1), a test system (2), a control system (3), and a data processing system (4); the liquid storage system (1) comprises a water storage barrel (11), a sealing cover (12), and an adaption box (13); a water injection opening (121) and an air inlet (122) are provided on the sealing cover (12); the test system (2) comprises a test bench (21), a water guide pipe (22), and a test barrel (23); the water guide pipe (22) is connected to the test barrel (23); the control system (3) comprises an automatic control valve (31), a heating rod (32), an air inlet pipe (34), a high-pressure gas tank (35), and a pressure reducing valve (36); the automatic control valve (31) is connected to the adaption box (13); the high-pressure gas tank (35) is communicated with the air inlet (122); the data processing system (4) comprises a signal acquisition device (41) and a computer (42). Also disclosed is a method for determining a permeability coefficient by means of instantaneous Darcy's law and the system. The present system and method have the beneficial effects of high degree of automation, short test period, and more accurate measurement.

Description

technical field [0001] The invention relates to the technical field of rock seepage experiments, in particular to a test device for measuring the permeability coefficient of variable water head and a method for measuring the permeability coefficient by using the device. Background technique [0002] Similar material simulation experiment is an important technical means of geotechnical engineering research. In the laboratory, a model similar to the actual engineering is made according to the similarity principle, and the mechanical parameters and stress distribution of the model are observed with the help of test instruments, and the results of the research on the model are used to infer The mechanical phenomena that may occur in the prototype, as well as the law of rock mass stress distribution, so as to solve the practical problems in the production of geotechnical engineering. Similarly, in the process of mine geological research, it is also an important research method to...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem that the permeability experiment takes a long time and the experiment is affected by temperature and pressure changes, the accuracy of the permeability coefficient measurement is not high. The present invention provides a variable head permeability coefficient measurement system and measurement method. The specific technical scheme is as follows

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