| Using the jinwen Railway shiziling tunnel as the background,for a variety of three-dimensional cross-tunnel burst blasting and safe construction,,this paper carried out a large section 、 shallow overburden 、 multi-disturbance、 multi-cross tunnel technology research of safety and rapid construction.The main work and the results are obtained as follows:(1)On the basis of summing up the experience of construction,this paper form a set of safety and rapid construction technology and the method and principle of judging about the buildings of tunnel under the buildings.(2)Numerical Simulation of blasting construction of shiziling tunnel under the Longfeng Villa show that the maximum principal stress of the surrounding rock in the tunnel during the blasting excavation is usually found at the central section of arch and inverted arch of the tunnel and the minimum principal stress is usually found at the central section and the bottle section of arch.with the excavation,the plastic zone is spread by the shoulder section arch to the foot of arch.After the excavation,the plastic zone is mainly concentrated on the central section of arch and the plastic zone is related to the span of the tunnel.(3)About the impact of the new tunnel blasting on the existing buildings,this paper show blasting shock model of Annular stratification and horizontal stratification has a great effect on reducing the disturbance of tunnel blasting on surface buildings.Under the condition of this model,the surface subsidence is less affected by the blasting excavation,which shows that the blasting shock and reinforcement design play a great role.(4)The real-time monitoring of the blasting vibration response conducted by the tracking construction shows that the blasting shock model of Annular stratification and horizontal stratification in complex construction environment reflect the design concept of blasting shock in Shock and isolation and achieved the desired goal... |
PDF Full Text Request