Fig. 4From: An adaptive prediction method for mechanical properties deterioration of sandstone under freeze–thaw cycles: a case study of Yungang GrottoesFitted curves of experimental data and the AMGBDT model when the number of freeze–thaw cycles is adopted as a variable: a relationship between the strength loss rate and the number of freeze–thaw cycles; b relationship between the elastic modulus and the number of freeze–thaw cyclesBack to article page