高地应力环境下梯段爆破诱发振动特征的试验研究  

EXPERIMENTAL STUDY ON CHARACTERISTICS OF VIBRATION INDUCED BY BENCH BLASTING UNDER HIGH IN-SITU STRESS CIRCUMSTANCES

作　　者：李鹏[1,2] 卢文波[1,2] 陈明[1,2] 舒大强[1,2] 

机构地区：[1]水资源与水电工程科学国家重点实验室武汉大学,武汉430072 [2]武汉大学水工岩石力学教育部重点实验室,武汉430072

出　　处：《工程爆破》2011年第1期1-7,共7页Engineering Blasting

基　　金：国家973计划项目(2010CB732003);国家"十一五"科技支撑计划(2008BAB29B01);国家自然科学基金面上项目(50779050;50909077)

摘　　要：采用傅里叶变换和小波变换等方法,对露天梯段爆破与高地应力环境下梯段爆破的实测数据进行对比分析,对高地应力环境下爆破施工所诱发振动的特征进行研究。分析结果表明:在岩性、钻爆参数相近的情况下,高地应力条件下梯段爆破的主频较高,而露天梯段爆破的主频则相对较低;露天梯段爆破诱发的振动主要来源于爆破荷载作用,而高地应力条件下梯段爆破诱发的振动为爆炸荷载作用产生的振动和地应力动态卸载产生的振动的叠加;地应力水平越高,初始地应力动态卸载所诱发的振动就越大。The measured data of bench blasting under high in-situ stress circumstances and open-pit bench blasting were compared by means of Fourier Transform and Wavelet Transform,and the characteristics of vibration induced by blasting excavation under high in-situ stress circumstances were studied.The results indicate that,with the similar rock condition and drilling-blasting parameters,the main frequency of bench blasting under high in-situ stress condition is higher than that of open-pit bench blasting;the vibration induced by open-pit bench blasting mainly originates from blasting load,while the vibration induced by bench blasting under high in-situ stress condition is the superposition of vibrations induced by explosion load and dynamic unloading of in-situ stress;the vibration induced by dynamic unloading of in-situ stress increases with stress level.

关 键 词：高地应力 爆破振动 功率谱 时能密度曲线 动态卸载 

分 类 号：O382.2[理学—流体力学]