Abstract
Flaws existing in rock mass are one of the main factors resulting in the instability of rock mass. Epoxy resin is often used to reinforce fractured rock mass. However, few researches focused on mechanical properties of the specimens with a resin-infilled flaw under triaxial compression. Therefore, in this research, epoxy resin was selected as the grouting material, and triaxial compression tests were conducted on the rock-like specimens with a grout-infilled flaw having different geometries. This study draws some new conclusions. The high confining pressure suppresses the generation of tensile cracks, and the failure mode changes from tensile-shear failure to shear failure as the confining pressure increases. Grouting with epoxy resin leads to the improvement of peak strengths of the specimens under triaxial compression. The reinforcement effect of epoxy resin is better for the specimens having a large flaw length and those under a relatively low confining pressure. Grouting with epoxy resin reduces the internal friction angle of the samples but improves their cohesion. This research may provide some useful insights for understanding the mechanical behaviors of grouted rock masses.
Highlights
Rock masses always obtain lots of discontinuities, such as faults, joints, weak surfaces, and fissures
Fissures play a significant role in determining their mechanical properties and failure modes. erefore, extensive researches focused on the strength and failure behavior of rock samples or rock-like samples with fissures under uniaxial, triaxial, and shear stress conditions [1,2,3,4,5,6]
Liu and Liu [8] carried out cyclic triaxial experiments on rock samples with preexisting flaws having different flaw geometries, and their results show that failure modes and dynamic deformation were affected by the flaw geometry and confining pressure and indicated that the dynamic strength decreased with the increasing flaw dip angle and increased with increasing confining pressure
Summary
Rock masses always obtain lots of discontinuities, such as faults, joints, weak surfaces, and fissures. Yang et al [7] conducted conventional triaxial compressive tests on marble specimens with preexisting fissures and found that the failure behaviors and peak strengths of samples depend on the geometry of the fissure and the confining pressure; they observed three basic failure modes (tensile, shear, and mixed failure) in the specimens with fissures under low confining pressure. By conducting experiments on the rock-like specimens with a preexisting flaw, Xiao et al [10] observed three different crack types and three different failure modes and found that the mechanical properties and failure modes of the specimens were greatly affected by the confining pressure. By conducting experiments on the rock-like specimens with a preexisting flaw, Xiao et al [10] observed three different crack types and three different failure modes and found that the mechanical properties and failure modes of the specimens were greatly affected by the confining pressure. e above studies provided numerous helpful conclusions about the influences of confining pressure and flaw geometry
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