减荷槽数量对双曲线冷却塔倒塌效果的影响研究  

Research on Influence of Number of Load Reducing Slots on Collapse Effect of Hyperbolic Cooling Towers

作　　者：高文乐 李坤鹏 刘志成 史卓金 李传水 GAO Wen-le;LI Kun-peng;LIU Zhi-cheng;SHI Zhuo-jin;LI Chuan-shui(College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China;Zaozhuang Venus Blasting Co.,Ltd.,Zaozhuang 277100,China)

机构地区：[1]山东科技大学土木工程与建筑学院,青岛266590 [2]枣庄市金星爆破有限公司,枣庄277100

出　　处：《爆破》2020年第4期116-126,共11页Blasting

基　　金：国家自然科学基金(51874189)。

摘　　要：双曲线冷却塔爆破拆除通常采用机械破碎锤预先在塔壁上开设减荷槽的方法简化爆破切口,为进一步研究不同数量减荷槽对双曲线冷却塔倒塌效果的影响,利用ANSYS/ls-dyna有限元分析软件,采用共节点整体式建立双曲线冷却塔的三维立体模型,对冷却塔的爆破拆除倒塌过程进行了数值模拟,同时与工程实际进行对比分析。通过改变减荷槽的数量对冷却塔的倒塌过程、爆堆形态、倒塌范围以及触地速度进行数值模拟,确定最佳的减荷槽切口数量。研究结果表明:冷却塔倒塌的最远距离、冷却塔触地速度与减荷槽数量均呈现正态分布,减荷槽数量为6个、7个时冷却塔倒塌距离最近,塔壁破碎彻底,触地速度小。另外,爆破圆周角在180°到270°,尤其在235°左右的情况下,最佳的减荷槽切口数量为6个或7个,与实际工程相吻合。When conducting demolition of hyperbolic cooling towers,usually the mechanical breakers are used to preload load-reducing slots on the wall of the tower to simplify the blasting cut.To further study the effect of different numbers of load-reducing slots on the collapse effect of hyperbolic cooling towers,the finite element analysis software ANSYS/LS-DYNA was adopted.A three-dimensional model of a hyperbolic cooling tower was established using a common node to simulate the collapse process of the cooling tower under demolition blasting.The results were compared with those of actual projects.Changing the number of load-reducing slots,the numerical simulation was conducted to determine the optimal number of cuts in the load-reducing slots by analyzing the collapse process of the cooling tower,the shape of the blasting pile,the collapse range and the ground contact speed.The results showed that the longest distance of the cooling tower collapse,the cooling tower ground contact speed and the number of load-reducing slots all present normal distribution.When the number of load-reducing slots was set as 6 or 7,the distance of the cooling tower collapse was the shortest and the tower wall was completely broken.The ground contact speed was also small.The results of the study show that the optimal number of cuts in the load-relief slots is 6 or 7 when the circumferential angle of the blasting is between 180° and 270°,especially around 235°,which is consistent with those of actual projects.

关 键 词：减荷槽 双曲线冷却塔 整体式共节点 数值模拟 倒塌效果 

分 类 号：TU746.5[建筑科学—建筑技术科学]