| During the construction of water conservancy and hydropower projects,many construction tasks of hydraulic tunnels will be encountered.The application of blasting construction in the excavation of hydraulic tunnels has become more common and the technology is more mature.Hydraulic tunnels are arranged in corresponding positions according to their own functions and characteristics.If the hydraulic tunnels are constructed one after the other,the blasting vibration generated by the hydraulic tunnels under construction will affect the stability of the existing hydraulic tunnels to varying degrees.Within the controllable range,the study and analysis of the impact of blasting vibration on the stability of adjacent built hydraulic tunnels under different blasting conditions and how to reduce their impact are of great significance to the blasting construction of hydraulic tunnels.The main analysis contents and results of this article are as follows:1.The advantages of ANSYS / LS-DYNA and the selection of material models and parameter models in the modeling process are introduced.A model of the impact of blasting vibration on the stability of the adjacent hydraulic tunnel is established.2.In order to explore the dynamic response of the shock wave generated by blasting construction to the adjacent hydraulic tunnel,several blasting test schemes are designed,and the vibration velocity under two different conditions of different charge amount and different delay initiation time are analyzed and compared in homogeneous rock.3.Study on the attenuation law of blasting vibration in weak interlayers with different thickness.The dynamic response of the shock wave generated by blasting construction to the adjacent existing hydraulic tunnel when weak interlayers with different thickness exist between two adjacent tunnels is explored,and control measures for blasting vibration are proposed. |
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