Study on the seepage degradation behaviors and time-dependent evolution law of properties for splitting grouting reinforced body

The investigation of the seepage degradation behaviors and time-dependent evolution law of physical and mechanical properties for splitting grouting reinforced body (SGRB) is of scientific and engineering significance for the development of disaster prevention and control. The triaxial seepage tests and triaxial compression tests were conducted to investigate the effects of grout vein dip angle on the time-dependent evolution law of physical and mechanical properties, deformation characteristics, and seepage degradation behaviors. The characteristics of flaws within the SGRB specimens were also examined from a microscopic perspective based on the technology of industrial computed tomography. According to the test results, the seepage process of SGRB specimens exhibits obvious stage characteristics. The time-dependent evolution law of deformation, peak deviatoric stress, deformation modulus, and porosity of SGRB specimens is affected by the grout vein dip angle. The dry mass of lost particles is positively correlated with the experimental time. The evolution process of flaws and seepage channels within specimens with different grout vein dip angles at different cross-sectional positions shows significant differences. The seepage failure modes of SGRB specimens are mainly divided into soil-grout vein interface failure mode and soil seepage failure mode from a microscopic perspective.