【摘要】 采用数值模拟分析与室内试验相结合的方法,研究双锚杆加固方式和岩性对锚杆导轨作用和岩体剪切强度的影响。结果表明:增加最先受力锚杆的直径,能够减小双锚杆整体的应力、变形和破坏程度,且影响程度大于先受力锚杆直径比其他锚杆较小的加固方案,前者对提高岩体的剪切强度效果优于其他双锚杆的加固方案;岩块弹性模量越大,节理面的水平分离量越大,锚杆导轨作用越明显,但岩体剪切强度得到一定程度的提高。最后,通过室内相似试验,对数值模拟方法和结果进行进一步的验证。更多还原

【Abstract】 The influences of double bolts reinforcement patterns and lithology on the transverse track effects of bolts and shear resistances of discontinuous rock mass were investigated by both numerical analyses and physical tests. It is found that bigger diameter of first sustained force bolt has smaller stress, strain and failure zone of rock mass. Bigger first sustained force bolt can enhance higher strength of jointed rock mass than other schemes, thus having obvious reinforcement effect. Further, higher elastic modulus of rock mass can enlarge the horizontal separation displacement of joint plane, and the track effects of the double-bolts are more obvious. However, this enhancement for the shear strength of rock mass is limited to a certain extent. It is also found that laboratory test results are in agreement with numerical simulations, thus the tests are suitable for modeling transverse track effects of double bolts in jointed rock masses.更多还原