Study On Dynamic Response Law And Safety Control Technology Of The Blasting Construction On The Existing Diseased Tunnel

In the last few years,with the continuous development of the highway transportation in our country, especially the rapid growth of vehicles volume, the phenomenon of traffic congestion is becoming more and more prominent, which leads to more and more tunnel expansion project, and the the adjacent tunnel gradually appeared.As we know, the new tunnel blasting vibration has a very large influence on the existing tunnel, especially when it is damaged, therefore, the study on the influence of the existing diseased tunnel in new tunnel blasting vibration is very necessary.This thesis based on the project of Xin Ling tunnel to systematically research the regular influence of the existing diseased tunnel in new tunnel blasting vibration with the help of numerical simulation method and monitoring data. he blow part mainly talks about the research results:(1) According the monitoring data of the existing diseased tunnel, this paper analysis the distribution characteristics and spatial distribution of the existing diseased tunnel, a deeper analysis is focused on the typical damages such as cracks and caves, which provide the basis for the subsequent numerical simulation and monitoring program;(2) Establish the numerical simulation mode according to the statistical analysis data and then make a complete study on the operating damaged tunnel (cracks and caves in the tunnel lining), especially the study on the tunnel with different position and different range damages. Analysis the amplification and attenuation law of tunnel lining stress field and velocity field under blasting vibration.(3) According to the analysis of monitoring data and numerical results, selecting appropriate parameter indexes (velocity, stress) as monitoring control indicators in the near-by tunnel explosion monitoring program. And based on this, analysis the evolution characteristics of vibration response of tunnel with different damages and come up with the basic measurement of safety control standards, then establish a management system standard about the fracture and cavity disease.(4) Based on safety control standards and through the numerical simulation, To make reasonable suggestions for the existing tunnel on the maximum dose and millisecond time and other control measures.