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采用室内混凝土模型模拟和验证爆破扰动下既有隧道围岩的动力响应规律,揭示了隧道振动与动应力间的相互关系。监测数据表明,在爆炸冲击荷载作用下,既有隧道围岩径向加速度大于轴向加速度;同时,加速度峰值与炸药量成正比;在爆破地震波的传播方向上,受边界反射拉伸应力波的影响,各点的切向与径向拉应变峰值均为先减小后增大的规律;隧道轮廓面上监测点的数据进一步验证了爆破荷载作用下既有隧道围岩质点振速峰值方向和拉应力峰值方向并不对应的观点。分析表明,质点的振速峰值和拉应力峰值的方向在爆破近区相互垂直。
The interior concrete model is used to simulate and verify the dynamic response of surrounding rock of the existing tunnel under blasting disturbance, and the correlation between tunnel vibration and dynamic stress is revealed. The monitoring data show that the radial acceleration of the surrounding rock of the existing tunnel is greater than the axial acceleration under the impact load of explosion; meanwhile, the peak value of the acceleration is proportional to the amount of explosive; in the propagation direction of blasting seismic wave, The tangential and radial tensile strain peaks at each point are the first to decrease and then increase. The data of the monitoring points on the profile surface of the tunnel further verify the peak direction of the surrounding rock mass velocity of the existing tunnel under the blasting load and Tensile stress peak direction does not correspond to the point of view. The analysis shows that the peak velocity of the particle and the direction of the peak tensile stress are perpendicular to each other in the vicinity of the blasting.