Low compressive strength of the soft formation, such as mudstone, gypsum, gypsum, soft shale, soft limestone, sandstone.

低抗压强度的软地层，如泥岩。石膏。盐岩。软页岩。软石灰岩。砂岩。

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It passes mainly through the purple — color soft sandrock and mudstone in Triassic or Dyas Systems.

隧道主要通过三迭系、二迭系紫红色软质砂岩、泥岩岩层。

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To indicate the borderline between hard and soft rock behavior, a simple, convenient and feasible method is presented with judgement by the stability of mudstone in water.

文章以泥岩的水稳定性做为划分标准对泥岩的岩土界线进行了划分，并设计了一些试验方法及提出了试验的基本准则。

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