冷却塔爆破拆除倾倒解体及振动研究

针对采用复式切口的冷却塔爆破拆除,利用塑性铰理论对冷却塔整个倒塌过程中的运动状态进行深入分析。通过建立塔体触地瞬间的数学模型,以最大线应变理论作为塔壁破碎的力学依据,利用MATLAB数值软件进行分析,得到在塔体触地瞬间,除切口处塔壁发生破碎外,塔壁上部也将发生破碎解体,这与冷却塔实际倒塌过程中的破碎现象相吻合。当被爆物确定后,破碎截面坐标值随塑性铰转动极值的增大而减小。另外,对冷却塔爆破过程中对周围建筑危害最严重的塔体连续塌落进行分析,得出塔体连续塌落诱发的振速峰值随保留区截面塑性铰转动极值的增大而增大。鉴于此,提出对于今后冷却塔爆破应避免整体延期时间过大的建议,从而控制塔体转动角度,降低冷却塔爆破对周围建筑的危害。

On collapsing disintegration and vibration of a cooling tower subjected to blasting demolition

In order to study the blasting demolition of the cooling tower with compound incisions, the plastic hinge theory is used to analyze the motion state of the cooling tower in the whole collapse process. The mathematical model for the tower body instantly hitting the ground is established. And the maximum linear strain theory is considered to be the mechanical basis for the breakage of the tower wall. Analysis is carried out by the MATLAB numerical software. Analyzed results display that in addition to the wall at the incisions, the upper tower wall will undergo breakup and disintegration. This phenomenon coincides with the actual situation. When the explosive is determined, the coordinate value of the upper broken section decreases with the increase of the rotational extremum of the plastic hinge. In addition, the peak vibration velocity induced by the continuous collapse of the tower body hit the ground with blink section plastic hinge extreme increases. This conclusion is deducted by analyzing the of the tower-body continuous collapse that is the most harmful to the surrounding buildings during the blasting process. In view of that, the excessive total delay time should be avoided for the cooling-tower blasting in the future, so as to control the rotation angle of the tower and reduce the harm induced by cooling-tower blasting to surrounding buildings.