研究目的：红层软泥岩是一种特殊岩土，具有易崩解、易风化、遇水易软化等特点。
Research purpose: Red rock is a special terrane and it is easy to disintegrate, weather and be softened after absorbing water.
长沙地区红砂岩层以软硬岩交互沉积而成，其软岩具有强度低、抗风化能力差、遇水软化和失水崩解等特殊力学性质。
The special mechanical properties of the soft layer has low strength, weak resistance to weathering, soften by water and collapse after losing water.
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