Analysis of Vibration Response Law of Multistory Building under Tunnel Blasting Loads

Runke Huo,Sisi Tian,Shuguang Li,Jianchao Mao,Zhanping Song,Shan Lei,Yoshiaki Fujii,Zizhen Miao

doi:10.1155/2019/4203137

Abstract

This paper takes the Dizong tunnel engineering as its background. Combined with the on-site monitoring data, the wavelet packet program based on MATLAB was compiled to study the vibration response of the four-story masonry building in a typical southwestern mountainous area of China under the blasting load. The results showed that the maximum particle velocity increased to the 3rd floor and attenuation occurred on the 4th floor. The particle velocity in the z-direction was the largest and should be paid attention. The dominant frequency of the building showed a trend from high frequency to low frequency, the duration became short, and the acceleration decreased to the 4th floor. With the increase of the building floor, the main frequency domain of the building decreased and then gradually tended to the low-frequency domain. The high-frequency particle velocity gradually decreased, gathered to the low frequency, and developed from the dispersed multiband to the concentrated low-frequency band. The total energy value of vibration increased to the 3rd floor and then decreased to the 4th floor. The energy of the building was between 0 and 171.6 Hz. The higher the floor was, the more concentrated the energy was in the low-frequency domain.

Highlights

In recent years, many researches on the response of buildings under blasting load by tunnel construction have been conducted
Monitored the vibration velocity of the surface particles after the auxiliary hole blasting at the channel No 1 of Yan’an
The results showed that the frequency of single-delay vibration signal decreased with the size of the equivalent blasting vibration source if the geometrical shape and the charge structure of the blasthole remain constant for each time-delay blasting

Summary

Introduction

Many researches on the response of buildings under blasting load by tunnel construction have been conducted. Based on a hydraulic tunnel project in Guyuan City, Ningxia, China, Qiao et al [4] used the field test methods to analyze the blasting vibration frequency and vibration velocity. Based on the blasting construction of Qingdao Metro Tunnel, Yuan et al. [5] determined the safety allowable vibration velocity, blasting single hole charge, and construction vibration impact range of different buildings along the Qingdao. Based on a large amount of monitoring data, Reza et al [7] studied the effects of different rock formations, different detonators, and different explosives on the surface movement caused by blasting vibration near the underground and surface concrete structures during the construction of the upper Gotvand dam. Wang et al [17] determined the main parameters affecting the vibration spectrum by the K-means method based on a large number of blasting vibration signals. The results were intended to provide a theoretical basis and technical support for the evaluation of building safety under blasting vibration and for the optimization of blasting design

Engineering Background

Blasting and Monitoring Schemes

On-Site Monitoring Schemes

Results and Discussion

Conclusions