Dynamic response analysis of surrounding rock under the continuous blasting seismic wave

2017 International Conference on Structural, Mechanical and Materials Engineering

材料科学;力学

Gao, P.F.^1,2 ; Zong, Q.^1 ; Xu, Y.^1 ; Fu, J.^1

School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan, Anhui

232001, China^1

Anhui Jiangnan Blasting Engineering Co. Ltd., Anhui, Xucheng

242300, China^2

关键词: Amplification effects;    Blasting parameters;    Blasting seismic wave;    Different frequency;    Dynamic response analysis;    Dynamic response characteristics;    Stability of surrounding rock;    Underground engineering;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/248/1/012023/pdf
DOI  :  10.1088/1757-899X/248/1/012023

来源: IOP

【 摘 要 】

The blasting vibration that is caused by blasting excavation will generate a certain degree of negative effect on the stability of surrounding rock in underground engineering. A dynamic response analysis of surrounding rock under the continuous blasting seismic wave is carried out to optimize blasting parameters and guide underground engineering construction. Based on the theory of wavelet analysis, the reconstructed signals of each layer of different frequency bands are obtained by db8 wavelet decomposition. The difference of dynamic response of the continuous blasting seismic wave at a certain point caused by different blasting sources is discussed. The signal in the frequency band of natural frequency of the surrounding rock shows a certain degree of amplification effect deduced from the dynamic response characteristics of the surrounding rock under the influence of continuous blasting seismic wave. Continuous blasting operations in a fixed space will lead to the change of internal structure of the surrounding rock. It may result in the decline of natural frequency of the whole surrounding rock and it is also harmful for the stability of the surrounding rock.