摘要
为了探索不同装药结构下混凝土中爆破应力波的衰减规律,基于相似理论,开展了混凝土中不同装药结构的模型试验,采用16通道动态应变仪,采集了混凝土中炮孔轴向和径向不同位置处的应变值,并通过计算得到了各处的峰值应力,进而获得了不同装药结构下混凝土中炮孔轴向、径向爆炸应力波的衰减规律。结果表明:随爆心距的增加,爆破应力波呈现幂指数衰减;耦合装药结构炮孔壁受到的初压及最高压最大,爆轰波作用于介质时间较短,不耦合装药结构降低了孔壁初压,延长了爆轰压力作用时间;耦合装药结构在破碎区消耗大量能量,能量传递不均匀,不耦合装药结构爆破应力波衰减的较慢,能量传递均匀。
To explore the attenuation law of blasting stress waves in concrete under different charging structures,the strain values at different positions of the experimental models were tested by a 16-channel dynamic strain gauge based on similarity theory.Meanwhile,the attenuation law of axial and radial blast stress waves in concrete under different charge structures was obtained by calculating the peak stress.The results show that the blasting stress wave exhibits a power exponential decay as the distance between the blasting centers increases.The initial pressure and maximum pressure on the borehole wall of the coupled charge structure are the highest,and the detonation wave acts on the medium for a short time.The uncoupled charge structure reduces the initial pressure on the borehole wall and prolongs the time of detonation pressure action.The coupled charging structure consumes much energy in the crushing zone,and the energy transfer is uneven.The stress wave attenuation of the uncoupled charging structure during blasting is slow,and the energy transfer is uniform.
作者
郭志东
李光
祝贺超
胡世超
左进京
游帅
GUO Zhi-dong;LI Guang;ZHU He-chao;HU Shi-chao;ZUO Jin-jing;YOU Shuai(Ansteel Cornerstone Mining Corporation,Limited,Anshan 114047,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《爆破》
CSCD
北大核心
2024年第4期18-24,34,共8页
Blasting
基金
国家自然科学基金(52208384)。
关键词
模型试验
混凝土
不同装药结构
爆破应力波
应变
model experiments
concrete
different charge structures
bursting stress waves
strain
作者简介
郭志东(1971-),男,硕士、高级工程师,从事爆破工程方面的研究,(E-mail)gzdagky@163.com。
