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| Study on the deterioration mechanism of dolomite microscopic damage based on NMR technique#br# |
| QIN Qingci1，2，LI Kegang1，2，LI Mingliang1，2，LI Wang3，LIU Bo1，2 |
(1. Faculty of Land Resource Engineering，Kunming University of Science and Technology，Kunming，Yunnan 650093，China；
2. Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space，Kunming，Yunnan 650093，China，3. Yunnan Chihong Zinc Germanium Company Limited，Qujing，Yunnan 655000，China) |
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Abstract In order to explore the microscopic damage and deterioration mechanism of dolomite under static loading，combining the NMR relaxation mechanism and spectrum relaxation signal characteristics，a multi-peak normal mathematical model is proposed，at the same time，the NMR before and after the triaxial compression test Resonance detection signals verify the model. Combining the characteristics of NMR relaxation signals before and after the test and NMR imaging technology，the damage and deterioration mechanism of the microscopic pore structure in the rock is analyzed from the NMR relaxation spectrum signal and the pore size distribution characteristics. The results show that：(1) The proposed mathematical model can more completely characterize the NMR relaxation signal information，and the inversion fit is = 0.99. Combined with the NMR relaxation information during rock macroscopic failure，the proposed mathematical model can be used to Quantitatively evaluate the damage state of the rock. (2) Through the comparative analysis of the NMR test results before and after the rock compression failure test，the NMR test of the rock sample showed three typical peaks before the rock failure，and the small pores and mesopores have good connectivity，The distribution of large pores is less，after the rock is macroscopically destroyed，the connectivity of the medium and large pores is significantly enhanced，and the mesopores and large pores have typical“close-merge”characteristics. After the failure，the T2 spectrum peak area，and total spectrum The peak area ratio exceeds 90%，and the macroscopic damage value D＞0.9. (3) When the rock is damaged under different confining pressures，the nuclear magnetic relaxation signal characteristics of the internal pore structure are the same，and the distribution of large pores is dominant. The relationship between the difference in pore size distribution and the confining pressure is not significant. The research results will provide a reference for the scientific and quantitative evaluation of the damage state of rock mass engineering.
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2022, Vol. 41 
