摘要
为研究边坡抛掷爆破过程中影响爆破效果的各物理量的变化规律,将考虑高程影响的萨道夫斯基公式中全部变量因子函数化,对因子函数进行修正后的多元回归拟合,确定因子函数关系式;再对萨道夫斯基公式进行逐步回归分析,计算出相关系数。研究结果表明:单孔爆破方量为炸药量函数主要影响因子,最小抵抗线超过 2m时其他相关因子对炸药量函数影响率<10%;由高程放大率函数,理论上求得某一具体施工边坡放大效应的临界高程差值为 38m左右;同时研究发现比药量ρ为定值时,随水平距离 R增大,主频呈递减趋势;炸药量 Q为定值时,随水平距离 R增大,主频呈递减趋势,并且递减速率逐渐变缓;水平距离 R为定值时,随炸药量 Q的增大,主频呈递减趋势,并且递减速率逐渐变缓。该研究成果可用于缓解边坡抛掷爆破过程对周边建筑工程所引起的振动效应,确保边坡的最终稳定性。
In order to study the variations of physical variables affecting the blasting effect in the process of slope throw blasting, we functionized all variables in the Sadaovsk formula considering the influence of elevation and modified the factor function by multivariate regression fitting to determine the functional relationship. Subsequently we conducted stepwise regression analysis of Sadaovsk formula and gave the value of correlation coefficient. Results evinced that unit volume of single-hole blasting is the dominant factor of the explosive charge function. When the line of least resistance is over 2.0 m , the influence of other factors is below 10%. The critical elevation difference for elevation amplification effect is about 38 m. In addition, the main vibration frequency exhibited a decreasing trend with the increase of the horizontal distance R when the specific charge ρ is a fixed value;so did it when the explosive charge Q is a fixed value, and the deceleration rate reduced gradually. When R is a fixed value, the main vibration frequency declined also with the rising of Q , and such deceleration attenuated gradually. The research findings could be utilized to mitigating the vibration of surrounding buildings generated by slope blasting and to ensuring the final stability of slope.
作者
周文海
余建平
梁瑞
吕亚茹
王敦繁
陈宗杰
ZHOU Wen-hai;YU Jian-ping;LIANG Rui;LV Ya-ru;WANG Dun-fan;CHEN Zong-jie(School of Petrochemical Technology,Lanzhou University of Technology,Lanzhou 730050,China;Ocean College,Zhejiang University,Zhoushan 316021,China;Fujian Special Equipment Inspection and Research Institute,Fuzhou 350008,China)
出处
《长江科学院院报》
CSCD
北大核心
2019年第7期89-95,共7页
Journal of Changjiang River Scientific Research Institute
基金
国家自然科学基金项目(51566010,51076061)
甘肃省自然科学基金项目(B061709)
关键词
爆破振动
逐步回归算法
振动幅值
比药量
主频
高程放大率
blasting vibration
stepwise regression algorithm
vibration amplitude
scale charge
dominant frequency
elevation amplification