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。

youdao

Low compressive strength of soft to medium formations. Such as soft shale, soft limestone, soft sandstone, hard and soft abrasive interbedded medium formation.

低抗压强度的软到中等地层，如中软页岩。中软石灰岩。中软砂岩。和软硬研磨性夹层的中等地层。

youdao

Based on the monitored deformation of Chambers in soft shale during excavation, this paper analyses the features at different deformation stages in process of loss of stability.

本文基于某软弱页岩峒室群开挖过程中监测到的变形资料，首先分析了岩体失稳过程中不同变形阶段的特征。

youdao

Hard shoulders were not added until later - instead the carriageway was bordered by a strip of soft shale.

BBC: Marking 50 years of UK motorways