基于数字散斑技术的深埋隧道围岩岩爆倾向相似材料试验研究

利用相似材料模拟方法，借助数字散斑观测技术，对深埋隧道围岩岩爆倾向进行试验研究。分析考虑材料强度、开挖速度和支护作用影响下的岩爆发生和破坏规律，寻求岩爆发生与深埋隧道变形破坏之间内在的联系。试验结果与现场实际发生岩爆强度较高的岩石类型花岗岩、闪长岩等相比，破坏特征相似，且围岩强度越高，岩爆发生可能性越大；在高地应力状态和完整岩体中开挖速度对岩爆的发生影响较大；锚网支护对隧道围岩变形有一定的控制作用，也可一定程度上避免岩爆发生。支护试验结果与现场实际支护效果一致，随支护强度提高，隧道抵抗力增加，整体变形减小、稳定性提高。所得试验结论为深埋隧道的合理设计和安全开挖提供技术指导和理论依据，对革新深埋隧道开挖技术和支护技术具有重要的意义

Experimental study of deep tunnel surrounding rock rockburst proneness with similarity material simulating method based on digital speckle correlation technique

Using equivalent material simulating experimental method, with the help of digital speckle correlation technique, the rock burst tendency of deep tunnel surrounding rock is studied. The regularities of rock burst and surrounding rock failure considering the strength of materials, excavation speed and support pattern are analyzed. The internal relations between rock burst and surrounding rock deformation and failure in deep tunnel are sought. The experiment results contrasted with the actual rock types of the granite, diorite, etc. which has higher strength of rockburst, the surrounding rock failure characteristics are similar. The higher surrounding rock strength is, the greater probability of rock burst is; in the high stress state and intact rocks the excavation speed has a greater impact on the rock burst; bolt-mesh support has some control function to the tunnel wall rock deformation; but also to some extent avoided rockburst. Supporting test result is in conformity with the field situation; with the higher support strength, the tunnel resistance increased, the overall distortion reduced, the surrounding rock stability improved. The experiment results will provide technical guidance and theoretical basis for the rational design and safe excavation of deep tunnels and have great significance, for innovating deep tunnel excavation and support technology