Abstract
In this study, five groups of numerical models with different conditions were established by using PFC2D (particle flow code) to simulate the direct shear tests of noncoplanar nonthrough jointed rock mass. It is proved that normal stress and shear rate, as well as the connectivity rate, relief angle, and inclination angle of joints, have significant influence on the strength characteristics, number of cracks, and the stress of the rock mass according to measurement taken at five different measurement circles in the rock mass. Moreover, it is determined that in the process of shearing, no matter which group of tests are conducted, the number of cracks in the rock mass caused by tension is far more than that caused by the shear action. In other words, the failure of rock mass with different planes and discontinuous joints is mainly caused by the tension in the process of the direct shear test.
Highlights
A rock mass is a complex geological body with obvious nonlinearity, discontinuity, heterogeneity, and anisotropy
By comparing the number of DFN-t and DFN-s in Table 4, it is obvious that no matter how the normal stress changes, the number of cracks in each rock mass caused by tensile action is more than those caused by shear action. erefore, during the direct shear test, the damage caused by the tensile action of the rock mass is more obvious. us, it can be said that the failure of rock mass in the test is mainly caused by tension
When the shear rate is gradually increased to 0.10 mm/s, the peak shear stress of the rock mass increases to 4.3 MPa. erefore, the peak stress of the rock mass increases with the increase in the shear rate, and the shear strength of the rock mass is enhanced
Summary
A rock mass is a complex geological body with obvious nonlinearity, discontinuity, heterogeneity, and anisotropy. Erefore, the PFC2D program was used in this study to simulate the direct shear test, so as to investigate the influence of the undulating angle, inclination angle, joint connectivity rate, normal stress, and shear rate on the transfixion mechanism, strength, and deformation characteristics of NNJRM. By studying the stress-strain development state of the specimen as a whole based on the data collected from five measurement points inside the specimen (as shown in Figure 3) during the test, and the change in the number of cracks in the specimen during the test process, the mechanical properties of the nonpenetrating jointed rock mass under different working conditions were investigated.
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