Sensitivity analysis for shear strength of flat interface between shotcrete and granite in high temperature tunnel

摘要

For the sensitivity on the shear strength of flat interface between shotcrete and granite in high temperature tunnel, shear experiments were performed with concrete-granite combined specimens. By calculating the sensitivities of temperature, relative humidity, normal stress and concrete strength, the sensitivities of peak shear strength and residual shear strength were evaluated. The results show that the most sensitive factor is temperature and the more sensitive factors are relative humidity and normal stress for peak shear strength. Whereas it has weak correlation with concrete strength. The most sensitive factor is normal stress for residual shear strength, and all of temperature, relative humidity and concrete strength are weakly relative to it. High rock temperature has great influence on the peak shear strength, however, little effect on the residual shear strength which is similar to normal temperature.