岩体边坡锚注加固模拟试验研究

Simulation Experiment Study on the Treatment of Bolting and Grouting in Rock Slope Reinforcement

通过对层状岩石边坡锚注加固模拟剪切试验的研究,对比分析各种结构节理剪切力—剪切位移全程曲线的特点;阐述节理剪切破坏各个阶段的细观过程及不同节理的抗剪切强度和抗剪切刚度的特征。研究表明:锚注加固节理面抗剪切强度并不等于锚杆和胶结面抗剪切强度之和,其强度同步发挥的程度与锚杆钢筋的取材及钢筋配筋率有关;边坡锚注加固后,节理由原来的摩擦型节理和加锚柔性节理变为锚注刚性节理,由于节理的变形减小,可以有效地控制边坡的位移量;锚注节理的抗剪切强度随锚杆与节理面夹角的增大而减小,两者呈反比关系;当剪切力方向与锚杆倾向相同且在锚杆与锚注节理面夹角从90°到30°的变化过程中,锚注节理的抗剪切强度逐渐增大,表现为节理面的C值和φ值逐渐增大。

The simulated shear experiments of bolting and grouting treatment in stratified rock slope are carried out. The comparing analysis about the whole procedure curve in shear resistant experiment of joint rock mass under different conditions is done, which shows the characteristic of shear resistant strength and shear resistant stiffness for different types of rock joints. The experiments results indicate that the shear resistant strength of rock joint plane with bolting and grouting treatment does not equal to shear resistant strength of bolting plus shear resistant strength of joint plane. The reinforcement ratio and the material of bolt influence whether the bolting and grouting can exert their shear strength at the same time. After bolting and grouting treatment in slope, the type of joint changes from frictional joint and bolting flexible joint to rigidity joint. The displacement of slope can be controlled by the reduction of joint displacement. The shear resistant strength of joint increases with the decrease of the angle between bolt and joint, the relationship between them is in inverse ratio. The direction of shear force is the same with the dip direction of bolt. The shear resistant strength increases with the angle between bolt and joint changes from 90° to 30°, the values of c and φ of joint plane increase also.