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中文摘要：
为研究岩石经历冻融循环后的细观损伤演化特征,选取寒区花岗岩岩心为试样,划分为5组,在饱和状态下分别对各组进行多轮冻融循环试验,利用核磁共振技术在每轮冻融循环结束之后对试样进行检测,获得岩石在不同冻融阶段的试件表面变化、质量变化、弛豫时间T2分布、孔隙度变化和孔隙分布及结构成像等。通过对冻融循环数与试样质量、孔隙度等之间的关系进行分析对比,表明试样在冻融循环作用下岩石内部孔隙不断损伤扩展,孔隙度提高,使得试样在饱和状态下的质量增加。通过对比不同轮次核磁共振结构成像图,结合孔隙分布和孔隙度增长规律,总结岩石在冻融循环试验中的细观损伤的演化模式,为研究寒区岩体的破坏机理提供一定的理论依据。
英文摘要：
To get the microscopic damage of rock, granite rock from cold region was selected as samples （saturated） to conduct freeze-thaw cycle experiment of different cycle index. Nuclear magnetic resonance （NMR） technology was used to detect microscopic damage of rock samples after each cycle group. The changes of samples＇ surface, variation of mass, T2 spectrum, porosity changes distribution and porosity NMR images of different stage were obtained. The results indicate that pores in the rock expand and porosity increases, mass of samples in the condition of saturated also grows with the growing cycle numbers. Degradation evolution mode is obtained by comparative analysis of NMR images and porosity distribution and its increasing principle of different cycle index. This research will provide theoretical basis for the study of rock deterioration principle in cold region.
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