摘要
为研究初支混凝土在循环爆破荷载作用下爆破损伤的累积效应,通过引入等效距离和等效药量的概念,代替爆心距和最大段药量对萨道夫斯基经验公式拟合得到质点峰值振速的衰减公式,根据爆破损伤经典公式,推导了爆破损伤增量公式。通过分析质点峰值振速和损伤增量随爆破次数和等效距离变化的关系,得到了初支混凝土在循环爆破荷载作用下的爆破累积损伤规律。研究结果表明:累积损伤随爆破次数增加而增大,但损伤增量却逐渐减小,两者变化皆呈现出非线性关系;临近爆源的几组测点在经过循环爆破后初支混凝土的累积损伤已达到损伤界限;损伤增量随等效距离变化的关系与质点峰值振速衰减规律具有相似性,且两者具有较高线性相关性。
In order to study the cumulative effect of blasting damage of initial concrete support under cyclic blasting load,the concepts of equivalent distance and equivalent charge were introduced to replace the blasting center distance and maximum charge to fit the Sadowski empirical formula to get the attenuation formula of peak particle velocity(PPV).Based on the classic formula of blasting damage,a blasting damage increment formula is proposed.By analyzing the relationship of PPV and damage increment with blasting times and effective distance change,the blasting cumulative damage law of the initial concrete support under the cyclic blasting load is obtained.The research results show that the cumulative damage increases with the increase of blasting times,but the damage increment gradually decreases,both showing a nonlinear relationship.The cumulative damage of the initial concrete support of several sets of measuring points near the blasting source under cyclic blasting has reached the damage limit.The relationship between the damage increment and the equivalent distance is similar to the PPV attenuation law,and they have a high liner correlation.
作者
王海龙
李帅
赵岩
WANG Hai-long;LI Shuai;ZHAO Yan(Hebei Key Laboratory of Diagnosis,Reconstruction and Anti-disaster of Civil Engineering,Zhangjiakou 075000,Hebei,China;Engineering Technology Innovation Center for Transportation Infrastructure in Cold Areas of Hebei Province,Zhangjiakou 075000,Hebei,China;School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《工程爆破》
CSCD
北大核心
2021年第4期29-33,50,共6页
Engineering Blasting
基金
国家自然科学基金资助项目(51878242)
河北建筑工程学院校级研究生创新基金资助项目(XY202116)。
关键词
爆破荷载
声波测试
初支混凝土
质点峰值振速
累积损伤
blasting load
acoustic test
initial supported concrete
peak particle velocity
cumulative damage