Coupled chemical stress processes in rock fracturing

摘要

This paper reports some typical results of our study on the coupled chemical stress processes innrock micro- and macrofracturing. New devices were first developed. The chemical solutionsntested include Na2SO4, CaCl2, NaCl, NaHCO3 and HCl. The stress paths including uniaxialncompression, triaxial compression and creep load, coupled with chemical solutions, wereninvestigated. The results were compared with distilled water and natural water. The new features,nincluding evolution feature of porosity of rock samples under uniaxial or triaxial compression withnchemical solution, uniaxial and triaxial compressive strengths, Young’s modulus of granite,nsandstone and limestone affected by chemical solutions with and without porous pressure, effectnof chemical solutions on creep behaviours of sandstone, and effect of chemical solutions onnfracturing schemes, cracking propagation features of sandstone and granite, have been found.nBased on the tested results mentioned above, a new numerical method is developed to simulatenthe fracturing process affected by coupled stress chemical solutions. The results are verified withntests..