中文摘要：

以马头山组（K2m）、妥甸组（J3t）和下禄丰组（J1l）自然风干的紫色泥岩为研究对象,分别进行干湿、冷热和干湿冷热3种处理,并运用分维方法分析不同处理下紫色泥岩的崩解特性,发现分维数能比较准确地表征紫色泥岩的崩解过程：分维数越大,岩石破碎程度越高;分维数越小,岩石破碎程度越低。3种紫色泥岩在不同处理方式下崩解的分维数大小都是干湿冷热〉干湿〉冷热,可见,水热共同作用对母岩崩解的影响明显大于仅有水或热的作用。相同处理方式下3种泥岩的分维数大小为J3t〉J1l〉K2m,且在干湿和干湿冷热条件下J3t的崩解分维数与K2m和J1l的差异显著,这主要是由这3种泥岩的物理特性、元素组成以及其风化成度所决定的。

英文摘要：

This study focuses on the disintegration characteristics of sampled mudstone from the Matoushan group（K2m）,the Tuodian group（J3t） and the Lufeng group（J1l）,Yunnan province of Southern China.These sampled rocks are subjected to the treatments of wetting-drying（WD）,wetting-drying ＋ refrigerating-heating（WDRH） and refrigerating-heating（RH） under laboratory condition,respectively.The fractal dimension method is applied to analyze the disintegration characteristics of the sampled mudstone.The results show that the fractal dimension exactly described the disintegration characteristics of purple mudstone.The larger fractal dimension value is,the higher the degree of rock fragmentation is.The rank order of the fractal dimension of the three treatments is WDRH WD RH,and is significantly different between the treatments,indicating the effect of hydrothermal on mudstone is greater than the influence of just water or heat.The rank order of the fractal dimension of three purple mudstones is J3t J1l K2ms,and significantly different between the J3t,J1l and K2m under WD and WDRH,resulting from physical characteristics,chemical elements composition and weathering maturity.