Study On The Influence Of Blasting Construction Of Huangcao Tunnel In Yuhuai Double-track On The Operation Of A Nearby Tunnel

Based on the project of Huang Cao tunnel in Chongqing Yu Huai compound line,this paper use the finite element software MIDAS/GTS NX to establish the corresponding three-dimensional finite element numerical model for the analysis.The comparison of radial vibration velocity of the adjacent tunnel lining corresponding to the new front face and the dynamic response of new tunnel construction blasting load to adjacent tunnel lining under different conditionsv are studied.The main contents of this paper are as follows:1.the law of vibration response of lining structure of adjacent tunnel is studied by using the finite element numerical simulation while the yellow grass tunnel in the construction of blasting.The results show that the arch waist of adjacent tunnel is most affected by blasting vibration and the speed ratio of the adjacent tunnel to the rear of the palm face is larger than that in the front of the face of the tunnel.2.By analyzing and arranging the data of explosion monitoring on-site monitoring,and then using the linear regression analysis method to obtain the attenuation formula for the vibration velocity of the existing tunnel lining of Yellow Grass,the safety of the project during blasting construction is checked.3.Numerical simulation changes the distance between the two tunnels,and analyzes the dynamic response of the tunnel lining of an adjacent tunnel subjected to face-to-face blasting.Through the variation law of the vibration velocity and stress,the tunnel spacing is calculated to be within 1.5 times the hole distance.There may be damage to the existing tunnel lining.4.Numerical simulation changes the size of excavation footage of newly built tunnels.The variations of vibration velocity,stress,and displacement of the adjacent tunnel linings are analyzed.It is concluded that the maximum vibration velocity and stress occur at the arch of the adjacent tunnel,and the tunnel blasting The depth of excavation footage should be controlled within 2.5m,and over 2.5m of adjacent tunnel linings should be destroyed.