| With the rapid development of China’s urban process,the limited ground space has been unable to meet the requirements of development,and more and more people turn to the underground space.In order to relieve the traffic pressure on the ground,the subway as a fast and punctual means of transportation came into being at the historic moment,and the traditional overhead power lines have been transformed into safer and more stable underground power tunnels.However,with the continuous encryption of urban underground power tunnel and subway line network,it is bound to appear the overlapping phenomenon of power tunnel and subway tunnel.Long-term operation of subway vibration loading reduces the power the normal service life of the tunnel,brought in high voltage cable tunnel must be safe hidden trouble,so the subway vibration caused by adjacent power the dynamic response of the tunnel is a subject with realistic meaning,the power tunnels and underground tunnel construction of the planning and design has important guiding significance.In this article,through research,relying on the overlap range and power of guangzhou subway tunnel,combining with the outdoor large model test and numerical simulation of comprehensive measures,such as the subway vibration loading is studied under the action of electric power tunnel-metro tunnel and the soil dynamic response characteristics of the system,and electric power tunnel under different spatial location relationship by subway vibration response factors analysis.According to the results of model test and numerical simulation analysis,relevant opinions are put forward for the joint construction projects of power tunnel and subway tunnel in the future.The main work and research results are as follows:1.The train load vibration excitation system composed of signal generator,power amplifier and vibration exciter and the reaction frame system with adjustable height are designed.2.The vibration response law of power tunnel-soil-subway tunnel system is obtained through model test.The results show that the power tunnel of the attenuation in the direction of the electric power tunnel longitudinal section measuring point,and the attenuation trend is slow,and soil surface acceleration maximum acceleration of soil at the bottom of the subway tunnel,followed by lateral soil tunnel,the minimum for the top of the tunnel,in the process of vibration wave propagation in soil lateral faster than the longitudinal decay.3.The influence of frequency and speed on subway vibration response is obtained through frequency sweeping,changing load frequency and speed.The higher the frequency is,the greater the acceleration amplitude is.When the frequency is swept,the acceleration increases first and then decreases with the frequency.The greater the speed is,the acceleration amplitude increases,but the smaller the dynamic strain of the lining.4.Through the distance,cross Angle,parallel Angle three kinds of spatial position relationship analysis,found that the influence of crossing Angle on the subway vibration is very small,distance to the subway vibration has a certain degree of influence,but with the increase of distance,influence degree has shrunk,and electric power tunnel in parallel to the subway tunnel project,and by changing the Angle in the space,can effectively reduce the subway vibration on the influence of the electric power tunnel. |
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