The strength of clay-rich sandstone decreases significantly when in contact with water due to softening effects. This scenario can pose a severe threat to the stability of water diversion tunnels during construction and operation periods. To address the issues related to water-induced softening in clay-rich sandstone zones in a water diversion tunnel of Lanzhou Water Supply Project. t... https://lecoureures.shop/product-category/plein-air-femme-chaussures-soulier/