Researching The Dynamic Response Of Shallow Buried Tunnel Surrounding Rock And Supporting Structure Under The Construction Of Blasting

This paper based on Chong qing jiang bei tunnel engineering,the first for tunnel blasting vibration field monitoring data of linear regression analysis by using Steve sadove's empirical formula,and then by using the finite element software MIDAS/GTS setting tunnel three-dimensional numerical model,researching in different shallow buried tunnel construction under the condition of blasting load on the dynamic response rule of tunnel surrounding rock and supporting structure.In this paper,the main research contents and research results are as follows:1.According to field blasting monitoring data,analyzing the law of blasting seismic wave propagation,and by using mathematical regression method to get the engineering geological conditions of the value of the parameter ? and K,for blasting construction of similar projects having certain guiding significance.2.The research of shallow buried tunnel under the condition of different grade of surrounding rock,construction of blasting load,the initial supporting structure law of blasting vibration velocity and impact stress response.The results show that under different conditions of surrounding rock grade,the attenuation law of blasting vibration wave is similar.3.The study of shallow buried tunnel under the condition of different thickness of primary support,the initial supporting structure law of blasting vibration velocity and impact stress response.The results show that the thicker the thickness of the primary support,the more obvious of each monitoring section cut effect of blasting vibration peak velocity and stress;But in different thickness under the condition of primary support,attenuation law of blasting vibration wave is similar.4.Study of shallow buried tunnel in different plane curve radius,the initial supporting structure law of blasting vibration velocity and impact stress response.The results show that the greater the curvature of the tunnel,the greater the blasting vibration wave attenuation faster.