Freeze-thaw damage in coastal quartzite cliffs under seawater influence: From mechanical deterioration to a constitutive model - Yan Ai; Yiguo Xue; Fanmeng Kong; Jingkai Qu; Jianning Wang; Xinyu Liu; Jinrui Duan; Ziming Qu; Huaibing Wang; Tanfeng Feng; Xipeng Li (Engineering Geology, 2026)