An experimental study on creep properties of sandstone sample under stress - chemical - water flow coupling effect

Silty sandstone was taken as the research object in this study, where the uniaxial compression creep experiment was carried out on the sample in the size of phi 50x100mm under the coupling effect of chemical solution with constant-speed flow and constant stress. Through test, the timeliness law was derived for the deformation of sandstone sample under the stress - chemical - water flow coupling effect. On this basis, combined with SEM spectrum of the sample, an in-depth analysis was conducted on the occurrence mechanism of water-rock interaction in the rock minerals under chemical - water flow effect and the change laws of microscopic pore structure of the sample under the stress effect. This study provides a strong basis for correct assessment and prediction on the deformation characteristics of rock mass in the multi-field environment.