中文摘要：

基于注浆锚固裂隙砂岩单轴压缩试验结果,研究了不同锚固作用下裂隙砂岩破裂模式,探讨了锚杆根数以及预应力对裂隙砂岩破裂特征的影响,分析了含两根锚杆裂隙砂岩变形破坏过程中裂纹萌生、扩展和演化规律。结果表明：随着锚杆根数增加,裂隙砂岩最终宏观破裂模式趋于复杂,对30°裂隙倾角而言,试样逐渐由拉伸破裂过渡到拉剪混合破裂模式;而对45°裂隙倾角而言,试样逐渐由剪切破裂过渡到拉剪混合破裂模式。预应力抑制了裂隙岩样中拉伸裂纹的扩展和延伸,使得呈现的裂纹数显著少于无预应力条件下试样的裂纹数。最后以典型锚固裂隙砂岩试样为例,分析了变形破坏全过程中裂纹扩展特征。注浆锚固裂隙砂岩具有显著渐近破裂特点。

英文摘要：

Based on the uniaxial compression experimental results of fissured sandstone under different anchorages by grouting,the failure modes of fissured sandstone were investigated,and the effects of bolt number and pre-stress on failure characteristics of fissured sandstone were discussed.In the failure process of fissured sandstone with two bolts,the initiation,propagation and evolution of three-dimensional cracks were analyzed.The results show that the final microscopic failure mode of fissured sandstone becomes more complexed with the increase of bolt number.For fissured sample with a fissure angle of 30°,the failure mode of the sample indicates a transition from tension failure to tension-shear mixed failure.However for fissured sample with a fissure angle of 45°,the failure mode of the sample indicates a transition from shear failure to tension-shear mixed failure.Pre-stress restrains the expansion and propagation of tension cracks in fissured samples,which leads to a smaller crack number than that under the condition of non-prestress.Finally,taking some fissured sandstones as typical examples,we analyzed the behavior of crack propagation during the whole deformation and failure process.It is evident that the failure of fissured sandstone is asymptotic.