摘要
爆破孔壁压力峰值是进行非流固耦合爆破动力响应分析的重要参数。针对轮廓爆破孔壁压力峰值的计算方法问题,理论分析了爆炸冲击波与弹性壁面的相互作用,推导了空气冲击波与弹性壁碰撞后压力增大倍数的理论解,并采用流固耦合动力有限元数值分析方法,研究了3种岩体介质、2种轮廓爆破常用炸药、5种常用不耦合系数、2种轴向装药系数工况下轮廓爆破的冲击波碰撞压力增大倍数和炮孔壁压力峰值。结果表明:轮廓爆破时,爆炸冲击波与孔壁碰撞后压力增大倍数并不是常值,与炸药特性、孔壁介质条件、不耦合装药系数等因素相关,孔壁压力峰值也与上述因素密切相关。基于模拟的孔壁压力峰值数据的统计分析,并结合理论推导成果及常用爆破孔壁压力峰值计算形式,提出了一种新的轮廓爆破孔壁压力峰值计算方法。
The peak pressure on the borehole wall is an important parameter for non-fluid solid coupling dynamic analysis of blasting. Aiming at the method for calculating the borehole peak pressure of the contour blasting, the interaction between explosion shock wave and elastic wall is theoretically analyzed, and the theoretical solution of pressure increase multiple after the collision of air shock wave and elastic wall is derived. The fluid solid coupling dynamic finite element numerical analysis method is used to study the blast air shock wave increase factor and borehole peak pressure under three kinds of rock mass media, two kinds of commonly used explosives for contour blasting, five common decoupling coefficients and two kinds of axial charging coefficient conditions. The results show that: the explosion shock wave increase factor of contour blasting is not a constant, and it is related to explosives characteristics, borehole medium conditions, decouple coefficient and other factors, correspondingly, the borehole peak pressure is also related to the above factors. Based on the statistical analysis results of borehole peak pressure simulation, combined with the theoretical deduction results and the commonly used calculation formula for the peak pressure on borehole wall, a new method for calculating borehole peak pressure in the contour blasting is proposed.
作者
陈明
刘涛
叶志伟
卢文波
严鹏
CHEN Ming;LIU Tao;YE Zhiwei;LU Wenbo;YAN Peng(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,Hubei,China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering Ministry of Education,Wuhan University,Wuhan 430072,Hubei,China)
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2019年第6期101-110,共10页
Explosion and Shock Waves
基金
国家自然科学基金(51479147,51779193)
关键词
轮廓爆破
孔壁压力峰值
冲击波
压力增大倍数
不耦合系数
contour blasting
borehole peak pressure
shock wave
pressure increase multiple
decouple coefficient
