![]() Moreover, the anisotropic characteristics first gradually weakened and then enhanced. ![]() However, with increasing intermediate principal stress ( σ 2) under TTT conditions, both the axial strain, and the lateral strain ( ε 2) gradually decreased, and the lateral strain ( ε 3, expansion) first slow down and then accelerated. The conducted experiments showed that both the axial and lateral strains of the rock prior to failure under CTT conditions increased with increasing confining pressure. Both the conventional triaxial test (CTT) and the true triaxial compression test (TTT) were conducted for sandstone to investigate its deformation characteristics and the variation laws of volume strain during the progressive damage process under different confining pressures. ![]() Studying the true triaxial deformation characteristics and progressive damage behavior of sandstone is of great significance for the stability control of roadways.
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