Low compressive strength of the soft formation, such as mudstone, gypsum, gypsum, softshale, 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。
2
Low compressive strength of soft to medium formations. Such as softshale, 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。
3
Based on the monitored deformation of Chambers in softshale during excavation, this paper analyses the features at different deformation stages in process of loss of stability.