摘要
隧道爆破开挖过程对隧道围岩的扰动,可以用弹性动力学的Lamb问题来描述。利用动态光弹性方法,对Lamb模型进行了验证,研究了冲击荷载下模型内应力波的传播、相互作用以及刻槽的拦截效应。结果表明:(1)冲击荷载作用下,模型内传播的有P波、S波和Rayleigh波,与Lamb模型的力学解答是一致的;(2)等差条纹图的分布规律,可以合理解释岩爆高发区段与开挖面的位置关系,认为P波和Rayleigh波的致裂作用和传播规律是岩爆发生的重要因素;(3)在模型表面的刻槽,可以实现对岩爆有突出贡献的Rayleigh波的大量拦截,说明在隧道表面切槽的岩爆控制方法是可行的。
The perturbation in the process of blasting excavation for tunnel construction can be studied by Lamb model belong to elastic kinetics. The case was simulated by photo-elastic experiments, which included the propagation, interaction laws and interception effects of slot obstacle. Some results were obtained as follows： （1） there are Pressure, Shear and Rayleigh waves under the action of impact load, which is similar to the mechanical answers of Lamb model. （2） From the fringe patterns, the effects of inducing fracture and laws of propagation about Pressure and Rayleigh waves are important factors for rock-burst mechanism, which can explain the space relationship between rock burst and face. （3） The slot on model surface can effectively intercept stress waves, especially the important Rayleigh waves. So the method of controlling rock-burst with cutting slot is theoretically feasible.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第4期1139-1142,1167,共5页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No.40272119)
关键词
岩爆
动力学机制
LAMB问题
控制方法
动光弹
rock burst
dynamic mechanism
Lamb model
control method
dynamic photoelasticity
