关键词:  压缩蠕变, 试验研究, 侧向约束, 蠕变规律

Abstract: In recent years, the long-term stability problem of tunnel and large underground cavern caused by rock creep has been widespread focused by scholars at home and abroad. And great progress on the experimental research of rock creep has been made. Through the simulation of the stress state of surrounding rock, the Sandstone's uniaxial compressing creep tests under un-lateral restriction and lateral restrain were made respectively, and their creep deformation rules were comparatively analyzed. The test results show that the stress threshold value and ultimate strain value of accelerative creep were increased, and the creep rate was reduced. Based on the experimental data, the viscoelastic deformation rules with the rock stress level and time variation was proposed, thus providing the experimental basis for the numerical simulation and theoretical calculation.      

Key words: Compression creep, Experimental study, Lateral restriction, Creep rule