Numerical analysis for support mechanism of constant-resistance bolts

In order to study the tensile mechanical properties of constant-resistance bolts, the numerical simulation of the tensile strength of a constant-resistance bolt is carried out by using the RFPA software. The experimental results show that the maximum plastic strain is 12 times the maximum value of elastic strain after constant-resistance tensile fracture, and the stress value fluctuates in the range of 28.01~38.71 MPa during plastic deformation, and the fluctuation is stable. The results of numerical experiments are in good agreement with Academician He Manchao’s laboratory test results, which verifies the accuracy and reliability of the numerical test method. Based on this, the numerical method is used to study the interaction principle of the constant-resistance bolt and the surrounding rock under loading and to analyze the stress and deformation and failure characteristics of anchored rock mass. The support effects of the traditional and constant-resistance bolts are comparatively analyzed. It is shown by the test results that the support effect of the constant-resistance bolt is better than that of the traditional one, which provides an effective way to control the soft rock with large deformation damage and rock burst.