Study on Damage Characteristics of Mica Quartz Schist Under Dry-Wet Cycles Based on Nuclear Magnetic Resonance Technology
In order to study the micro-damage characteristics of mica quartz schist under different dry-wet cycles,nuclear magnetic resonance tests were carried out to quantitatively analyze the variation of damage variables.The results show that the pores of mica quartz schist have good connectivity under different dry-wet cycles,and the pores with small pore size develop intensively.With the increase in dry-wet cycles,the pore size expands and increases gradually.The pore size development of mica quartz schist is correlated.The number of small and medium pores increases rapidly before the 5th dry-wet cycles,and tends to be saturated after the 5 th～10th cycles,while some medium pores contin-ue to develop and expand into large pores,resulting in a decrease in the number of medium pores,and the number of large pores increases significantly after the 5th dry-wet cycles.The damage variable curve of mica quartz schist is obviously affected by the dry-wet cycle,and the damage variable curve approximately linearly rises under the action of the first 5 dry-wet cycles,and the development and expansion of pores and cracks inside the sample are fast.After the 5th dry-wet cycle,the development of the size and number of pores and cracks slows down,and the growth rate in damage variables of mica quartz schist gradually slows down.
dry-wet cyclemica quartz schistnuclear magnetic resonancedamage characteristic
万方数据
维普
