Influence of Types of Grouting Materials on Compressive Strength and Crack Behavior of Rocklike Specimens with Single Grout-Infilled Flaw under Axial Loads

Abstract

Rocklike specimens with a grout-infilled flaw having different inclination angles were prepared for uniaxial compressive tests to study the effect of types of grouting materials and flaw inclination angle on the compressive strength and crack behavior of specimens. Epoxy resin and cement paste were chosen as grouting materials; the mechanical properties of these two grouting materials are totally different. The experimental results showed that types of grouting materials play a significant role in improving the uniaxial compressive strength of specimens with a grout-infilled flaw. The grouting effect for epoxy resin is better than that of cement paste. The grouting effect has a close relation to the flaw inclination angle; whether the specimen is grouted with cement paste or epoxy resin, the grouting effect is significant when the flaw inclination angle is 60° and not good when the flaw inclination angle is 90°. Cracking behaviors and failure patterns were found to be affected by grouting materials and flaw inclination angle. The present study is helpful to understand the mechanical properties of rock masses with grout-infilled fractures.