It is characteri zed by a strong hydrophilicity and it can be softened and collapsed when meeting water and be weather shaken when losing water, with expansibility.

• 沙坡头坝基岩体以石炭系泥、页岩为主,具有亲水性强,遇水软化、崩解,失水干裂的特性,且具有膨胀性。