摘要
分析了岩体爆破中采用的空腔膨胀理论在研究爆破压碎区过程中存在的缺陷及其产生的原因,在球形爆破腔膨胀条件下压碎区的应变状态类似一维平面应变。然后以压碎区应力与变形的真实状态为基础,运用动量与质量守恒关系推导了爆破压碎区新型的速度场关系式。根据此关系可以得到揭示爆破压碎区大小的满足几何相似关系的实用表达式,数值计算表明此表达式正确可信。
The limition of the cavity expansion model in studing the kinematics in crushed zone was found. In this zone, the strain state is considered to be similar to one-dimension strain in-plane. According to true state of the stress and the strain near the cavity, a new formula of velocity field has been deducted by use of the conservation laws of momentum and mass. Using the formula, a practical expression that accords with geometrical resemblance relation, and can describe the size of the crushed zone, can be deduced. The results of numerical calculation show that the expression is authentic.
出处
《爆破器材》
CAS
2006年第1期1-4,共4页
Explosive Materials
关键词
爆破
空腔膨胀
速度场
压碎区
blasting,cavity expansion, velocity field ,crushed zone
