Abstract
Due to the complex formation process of a rock mass, a large number of fissures, joints, faults, other defects exist and the defects commonly contain infilled materials. The jointed rock masses are in a complex geological environment, in which the geometric distribution and the boundary condition can greatly affect the mechanical behavior of the infilled jointed rock mass. In this study, the infilled jointed rock mass specimens with different dip angles are prepared using similar materials, and the uniaxial and biaxial compression tests on the specimens are conducted. The effect of the joint dip angle on the mechanical behavior of the infilled jointed rock mass under uniaxial and biaxial compressions is investigated. The results show that the uniaxial compressive strength shows a W-shaped variation, and the biaxial compressive strength shows a V-shaped variation with an increase in the dip angle. Most of the cracks appear in pairs around the joint and occur symmetrically in a bilateral distribution, and the existence of the infilled joints induces a nonlinear mechanical behavior in the specimen. In addition, the specimens exhibit three failure modes under uniaxial compression: splitting failure, step-path failure and planar failure. The specimens present two failure modes under biaxial compression: splitting failure and planar failure.
Highlights
The stress on the surrounding rock can be redistributed due to the excavations in the deep underground
The experiment aimed at discussing the effect of the joint dip angle on the mechanical behavior of the infilled jointed rock mass; seven dip angle levels of 0◦, 15◦, 30◦, 45◦, 60◦, 75◦ and 90◦ were respectively designed, and three specimens were prepared for each level
The failure mode and the axial stress–strain curve of an intact specimen (No I01) under uniaxial compression are shown in Figure 3, and the sketch was displayed after the failure stage
Summary
The stress on the surrounding rock can be redistributed due to the excavations in the deep underground Disasters such as collapse and large deformation may occur during the stress redistribution [1,2,3], in which the original joints propagate and coalesce [4,5]. It is of great significance to study the mechanical behavior of the infilled jointed rock masses. A large number of investigations have been devoted to the mechanical behavior of jointed rock masses. Scholars developed a number of rock models containing single joints [8,9], two joints [10,11] and three joints [12,13], to study the initiation, the propagation and the coalescence
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