爆破拆除切口形状对冷却塔爆破效果影响及数值模拟

Numerical Simulation of effect of Cut Parameters on Explosive Demolition of Cooling Towers

介绍了某电厂内多座冷却塔爆破拆除的方案设计及爆破倒塌效果,利用动力有限元软件ANSYS/LS_DYNA对其中两座相同结构、不同爆破切口的冷却塔的爆破拆除过程及倒塌范围进行了数值模拟,计算结果表明:数值模拟的冷却塔倒塌姿态和倒塌范围与实际爆破效果比较相符,有限元软件的计算结果对爆破设计有一定的指导作用;另外,通过对模拟结果与实际爆破效果的对比分析,发现爆破切口形式对冷却塔塌落范围具有一定的影响,采用倒梯形切口的冷却塔爆堆长度比采用正梯形切口的要短,而且爆堆更为集中,故在复杂环境下对冷却塔进行爆破拆除宜采用倒梯形切口。

The blasting scheme and collapse effect of cooling towers in power plant were introduced.The dynamic FEM analysis software ANSYS/LS-DYNA was used to simulate the explosive demolition process and the collapsed scope of two cooling towers with similar structure and different blasting cut.Results showed the collapse form and scope of cooling towers from the simulation is good agreement with the practical blasting effect,which indicated the dynamic FEM method is a good means to simulate blasting demolition process.Combined with the simulated results in this study and the blasting practical effect,the form of the blasting cut was founded to produce some effect on the collapsed scope of cooling tower; the blasting pile length of cooling tower with inverted trapezoidal cut was shorter than the case with trapezoidal,and the blasting pile was more centralized.Therefore,the inverted trapezoidal cut design was mostly used to demolish cooling tower in complex environment.