LIU Zhixiong , ZHAO Tiancheng , SUN Peng , PANG Zheng
(Mining and Coal School , Inner Mongolia university of science and technology , Baotou 014010 , China)
Abstract : In order to explore the change of rock mesostructure and its influence on permeability under different loads , NMR equipment was used to test the pore size distribution of cement mortar samples under 8 different loads . By analyzing the pore size distribution un- der different loading conditions , the variation rule of microscopic characteristics of samples under different loading conditions was ob- tained . Through the quantitative characterization data obtained in NMR , the influence of the microscopic characteristics on the permea- bility of the sample was studied , and the quantitative calculation model of the permeability and the proportion of each aperture was es- tablished. The results show that with the increase of load , the number of micropores with different diameters in the sample increases gradually , and the increase of small pores is smaller while that of large pores is larger. There is a negative correlation between the pro- portion of small pores and the permeability. Meanwhile,large pores relates positively to the permeability.
Key words : rock-like sample; nuclear magnetic resonance technology; different loads; mesostructure; permeability