After millions of years of geological evolution and a complex multi-stage tectonic movements, the rock contains a random distribution at different levels of sub-micro-pores and cracks.

经过亿万年的地质演变和多期复杂的构造运动，使岩石含有不同阶次随机分布的微孔隙与裂纹。

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Frozen soil is a kind of multi-phrase compound material. There are many defects and micro-cracks in frozen soil.

冻土是多相体复合材料，土体冻结过程中在内部形成空穴、裂隙等多种缺陷。

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