Comparison of vibrations induced by excavation of deep-buried cavern and open pit with method of bench blasting  

作　　者：卢文波 李鹏 陈明 周创兵 舒大强 

机构地区：[1]State Key Laboratory of Water Resources and Hydropower Engineering,Wuhan University [2]Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering,Ministry of Education,Wuhan University

出　　处：《Journal of Central South University》2011年第5期1709-1718,共10页中南大学学报（英文版）

基　　金：Project(2010CB732003) supported by the National Basic Research Program of China;Projects(50725931,50779050 and 50909077) supported by the National Natural Science Foundation of China

摘　　要：The measured data of vibrations induced by excavation of deep-buried cavern and open pit with method of bench blasting were analyzed by Fourier Transform and Wavelet Transform,and the characteristics of vibrations induced under these two circumstances were studied.It is concluded that with the similar rock condition and drilling-blasting parameters,vibration induced by bench blasting in deep-buried cavern has a higher main frequency and more scattered energy distribution than that in open pit.The vibration induced by bench blasting in open pit is mainly originated from the blast load,while the vibration induced by bench blasting in deep-buried cavern is the superposition of vibrations induced by blast load and transient release of in-situ stress.The vibration induced by transient release of in-situ stress increases with the stress level.The measured data of vibrations induced by excavation of deep-buried cavern and open pit with method of bench blasting were analyzed by Fourier Transform and Wavelet Transform, and the characteristics of vibrations induced under these two circumstances were studied. It is concluded that with the similar rock condition and drilling-blasting parameters, vibration induced by bench blasting in deep-buried cavern has a higher main frequency and more scattered energy distribution than that in open pit. The vibration induced by bench blasting in open pit is mainly originated from the blast load, while the vibration induced by bench blasting in deep-buried cavern is the superposition of vibrations induced by blast load and transient release of in-situ stress. The vibration induced by transient release of in-situ stress increases with the stress level.

关 键 词：deep-buried cavem open pit blasting vibration power spectra time-energy density in-situ stress 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]