爆破振动对隧道围岩累积损伤效应的影响  

Influence of blasting vibration on cumulative damage of surrounding rock

作　　者：宋肖龙 高文学[1] 季金铭 叶明班 张登杰 SONG Xiaolong;GAO Wenxue;JI Jinming;YE Mingban;ZHANG Dengjie(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《振动与冲击》2020年第24期54-62,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(10004016201601)。

摘　　要：为了研究隧道掘进爆破对围岩造成的累计损伤效应,利用地质雷达对隧道爆破开挖过程中围岩损伤进行探测,根据地质雷达信号具有短时非平稳的特点,采取希尔伯特-黄变换(HHT)的方法对雷达信号进行处理,去除干扰,提取可以有效反映损伤特征的瞬时参量,进而得到较为直观的围岩损伤图像,并基于瞬时振幅的差异将损伤区域分为轻微损伤和严重损伤区域。研究表明,循环爆破作用会对爆破近区直接造成大量的严重损伤,而爆破中远区受到直接爆破作用影响较小,几乎不产生新生损伤,但已有的轻微损伤会进一步的演化加剧变成严重损伤,在距离爆源60 m范围之内,扰动次数越多,损伤演化越剧烈。To study the cumulative damage effect of tunnel blasting on surrounding rock,the ground penetrating radar was used to detect the surrounding rock damage during tunnel blasting excavation.Based on the characteristic of a short-time non-stationary random signals,the Hilbert-Huang transform(HHT)method was used to process the radar signals to remove interference and extract instantaneous parameters that can effectively reflect the damage characteristics,thereby obtaining a more intuitive image of surrounding rock damage area.The damage area could be divided into minor and severely damaged areas based on the difference in instantaneous amplitude.The results show that blasting can directly cause a large number of severely damage to the near area.The farther area is less affected by direct blasting,and almost no new damage is generated,but the minor damage area that already exists could turn into severely one,and within 60 m from the explosion,the more the number of blasting,the greater the cumulative damage effect would be.

关 键 词：隧道爆破 地质雷达 希尔伯特-黄变换(HHT) 累计损伤 

分 类 号：TD235[矿业工程—矿井建设]