摘要
首先对烟囱的结构进行分析;然后利用分步计算法对烟囱绕爆破切口处直径的转动惯量进行了计算;最后以水钢80 m钢筋混凝土烟囱为例进行了工程实例计算。算得其转动惯量数量级较大,而转动惯量是衡量刚体转动时惯性的量度,也就是说在烟囱爆破倾倒时的惯性较大,运动状态比较难改变,同时在刚刚起爆后偏心不大,偏转力矩相对较小,从而导致烟囱在起爆后1-2 s内倾倒速度缓慢,使得烟囱全部重力集中在后面支座上,如果支座达到抗压极限强度,就会发生后座现象。因此其转动惯量是影响烟囱定向爆破倒塌的一个重要参数,由此可以得出一些爆破参数设计的依据。
Firstly,the structure of the chimney is analyzed.And then the rotational inertia of the chimney around the diameter of blast cut is calculated by step.Finally,the reinforced concrete chimney which is 80m high in Shuigang is calculated as an engineering example.The order of magnitude of rotational inertia is very huge,and the rotational inertia is an important measurement to measure the inertia of the rigid body.That is to say the inertia of collapse of chimney explosive demolished is very large and difficult to change the state of motion.Meanwhile,the small eccentric and deflection torque after blast leads to dump slowly in first 1~2 seconds,so backstand will bear all of the chimney＇s weight.When the backstand reaches theultimate compressive strength,it will fall backward.So the rotational inertia is an important parameter for directional collapse of chimney explosive demolition design.
出处
《爆破》
CSCD
北大核心
2010年第4期82-84,90,共4页
Blasting
关键词
烟囱
爆破切口
转动惯量
chimney
blast cut
rotational inertia
