Coal sample seepage test method under true triaxial state

Abstract

The invention discloses a method for testing coal sample seepage under a true triaxial state. The method comprises the steps of: 1) preparing a sample; 2) installing the sample; (3) filling oil, evacuating and vacuumizing; (4) loading; (5) absorbing by gas; (6) measuring seepage parameters; (7) stopping an experiment, and (8) storing data. According to the method, a real work condition can be really simulated and a theoretical basis is provided for solving on-site problems.

Description

Technical field [0001] The invention relates to a seepage test method of a coal sample in a true triaxial state. Background technique [0002] Coal and gas outburst is an extremely complex dynamic phenomenon that occurs in coal mines. It can spray a large amount of coal and gas out from the coal body to the mining space in a very short time, which seriously threatens the safe production and production of coal mines in my country. Safety of miners' lives. Therefore, it is very important to strengthen the research of coal and gas outburst mechanism. Studies have shown that coal and gas outburst is a process of shear failure of coal under the cyclic action of internal and external stresses, that is, internal and external stress induced by changes in the geostress field, coal rock structure and gas state and flow caused by mining activities. When the coal body is locally fractured and destroyed under the action of external forces to form a source of outburst, a certain intensity of ...

AI Technical Summary

Problems solved by technology

Deep high temperature and a series of problems caused by it have become a difficult problem in deep mining. At present, the research on the influence of temperature in deep mining is still in the initial and qualitative stage. The main problems are as follows: the real stress environment is not considered; In the constitutive equation of the rock rheological model established under the coupling of temperature and pressure, the consideration of temperature as a linear factor needs to be proved and improved when the temperature field distribution and temperature change have not been specifically clarified; The influence of temperature on transformation lacks quantitative analysis, and no specific parameter equation with general significance has been formed. There is no clear mathematical formula to express the range, degree of influence and mechanism of temperature in brittle-ductile transformation; The calculation of rock mass damage under TM coupling and the relationship between the two types of damage still need further research and proof; for the coupling between temperature-pressure-water-time and the influence form and depth of temperature under the influence of several factors In-depth research is still needed; the study of temperature should focus on the process of dynamic changes, and conduct in-depth analysis from both micro and macro perspectives

Therefore, none of the above equipment can meet the experimental requirements for researching and solving the practical problems faced by coal mines at present and in the future

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